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Calix

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FY2012 Annual Report · Calix
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Calix 2012 Annual Report

“The shift of content to the cloud and the proliferation of broadband-ready devices

continues to reinforce the strategic importance of the access network. 

We believe that communications service providers globally are well-positioned to 

capitalize on this opportunity, as is Calix – the largest telecommunications 

vendor in the world focused solely on this space.”

–  Carl Russo, President and CEO

Fellow Calix Stockholders,  

2012 was a year of transition for our industry, as communications service providers (CSPs) weathered 
regulatory and macroeconomic uncertainty and consolidation challenges. Despite these headwinds, we 
continued to execute on our long-term strategy, strengthening our organization and customer base, expanding 
our Unified Access portfolio of software, systems and services, and fostering key relationships that provide a 
solid foundation for growth.  

2012 Highlights  

  New Access Innovations – We continued to enhance and expand Calix’s industry-leading Unified 
Access portfolio of software, systems, and services with solutions we believe will enable our 
customers to become the broadband service providers of choice to their subscribers, including: 

o  The industry’s highest density VDSL2 copper-based solutions; 
o  The award-winning 836GE Residential Services Gateway; and 
o  The BLM1500 GPON Access Terminal and EntriView management system, a high-

capacity, high-density GPON access solution deployed and operationalized in many Tier 1 
networks worldwide. 

  Expanded Strategic Relationships – We entered into preferred global reseller relationship with 
Ericsson which provides an important complementary new sales channel for our international 
expansion; and 

  Grew Our Customer Base – We significantly expanded our customer base to more than 1150 CSPs 

and opened new market opportunities; our systems and software are now deployed in CSPs serving 
more than 100 million subscriber lines. 

Although revenue declined 4.2% in 2012 compared our record $344.7 million in the prior year, Calix finished 
the year on a strong note, carrying the momentum of two solid quarters into 2013. Our non-GAAP gross 
margin improved for the fifth year in a row to 44.4%, up from 34.0% in 2008 and we generated positive cash 
flow from operations for the fourth year in a row, $27.7 million in 2012. I am proud of what the Calix team 
accomplished in 2012, and believe that we are well positioned to resume the double-digit growth trajectory we 
accomplished in fiscal years 2010 and 2011. 

The shift of content to the cloud and the proliferation of broadband-ready devices continues to reinforce the 
strategic importance of the access network. We believe that CSPs globally are well-positioned to capitalize on 
this opportunity, as is Calix – the largest telecommunications vendor in the world focused solely on this space. 
Today, we are the leading broadband access vendor in North America. Through continued disciplined 
execution, we are excited about the opportunities ahead of us as we move beyond the 15% of the global 
communications market we have addressed to date. 

We thank our customers, suppliers, employees and you our fellow Calix stockholders for your support as we 
continue to build a great broadband communications access systems and software company and connect the 
world through access innovation.  

Sincerely,  

Carl Russo  
President and CEO  
Calix, Inc.  

Note: The above includes forward-looking statements. Please refer to the Section entitled SPECIAL NOTE REGARDING FORWARD 
LOOKING STATEMENTS, on the attached Annual Report on Form 10K for a discussion of forward-looking statements and the risk factors 
that may impact our future results. The Annual Report on Form 10K can be found on the Investor Relations section of www.Calix.com. 
We also make reference to Non-GAAP measures in the above letter. Please see our press release issued on February 5, 2013 which can 
be found on the Investor Relations section of www.Calix.com for a reconciliation of these Non-GAAP to GAAP measures.  

 
 
 
 
 
 
 
 
 
 
 
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549

FORM 10-K

(Mark One)

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE 
ACT OF 1934

For the fiscal year ended December 31, 2012 

OR 

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
EXCHANGE ACT OF 1934

For the transition period from             to             

Commission File Number: 001-34674

Calix, Inc.

(Exact Name of Registrant as Specified in Its Charter)

Delaware
(State or Other Jurisdiction of
Incorporation or Organization)

1035 N. McDowell Blvd.
Petaluma, California
(Address of Principal Executive Offices)

68-0438710
(I.R.S. Employer
Identification No.)

94954
(Zip Code)

Registrant’s telephone number, including area code (707) 766-3000

Securities registered pursuant to Section 12(b) of the Act:

Title of each class
Common Stock, $0.025 par value

Name of each exchange on which registered
The New York Stock Exchange

Securities registered pursuant to section 12(g) of the Act:

(Title of class)

(Title of class)

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities 

Act.   Yes:  

    No:  

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the 

Act.   Yes:  

    No:  

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities 

Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and 
(2) has been subject to such filing requirements for the past 90 days.    Yes:  

    No:  

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every 

Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the 
preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes:  

    No:  

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not 
contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated 
by reference in Part III of this Form 10-K or any amendment to this Form 10-K.   

 
 
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller 
reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the 
Exchange Act.

Large Accelerated Filer

Accelerated Filer

Non-accelerated filer

(Do not check if a smaller reporting Company)

  Smaller Reporting Company

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes:  

    No:  

The aggregate market value of the Common Stock held by non-affiliates of the registrant based upon the closing sale price on the New 

York Stock Exchange on June 29, 2012, the last business day of the Registrant’s most recently completed second fiscal quarter, was 
approximately $325,447,629. Shares held by each executive officer, director and by each other person (if any) who owns more than 10% of 
the outstanding common stock have been excluded in that such persons may be deemed to be affiliates. This determination of affiliate status 
is not necessarily a conclusive determination for other purposes.

As of February 14, 2013, the number of shares of the registrant’s common stock outstanding was 48,912,031.

DOCUMENTS INCORPORATED BY REFERENCE
Portions of the registrant’s definitive proxy statement for its 2013 annual meeting of stockholders are incorporated by reference in Items 10, 
11, 12, 13 and 14 of Part III.

Calix, Inc.

Form 10-K

TABLE OF CONTENTS

PART I

Item 1.

Business

Item 1A.

Risk Factors

Item 1B.

Unresolved Staff Comments

Item 2.

Item 3.

Item 4.

Item 5.

Item 6.

Item 7.

Properties

Legal Proceedings

Mine Safety Disclosures

PART II

Market for Registrant’s Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity 
Securities

Selected Financial Data

Management’s Discussion and Analysis of Financial Condition and Results of Operations

Item 7A.

Quantitative and Qualitative Disclosures About Market Risk

Item 8.

Item 9.

Financial Statements and Supplementary Data

Changes in and Disagreements With Accountants on Accounting and Financial Disclosure

Item 9A.

Controls and Procedures

Item 9B.

Other Information

Item 10.

Directors, Executive Officers and Corporate Governance

Item 11.

Executive Compensation

PART III

Item 12.

Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

Item 13.

Certain Relationships and Related Transactions, and Director Independence

Item 14.

Principal Accountant Fees and Services

Item 15.

Exhibits and Financial Statement Schedules

Signatures

PART IV

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50

76

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SPECIAL NOTE REGARDING FORWARD LOOKING STATEMENTS 

This report includes forward-looking statements that involve substantial risks and uncertainties. All statements other than statements of 

historical facts contained in this report, including statements regarding Calix’s future financial position, business strategy and plans and 
objectives of management for future operations, are forward-looking statements. In some cases, you can identify forward-looking statements 
by terminology such as “believe,” “may,” “estimate,” “continue,” “anticipate,” “intend,” “should,” “plan,” “expect,” “predict,” “potential,” or 
the negative of these terms or other similar expressions. Forward-looking statements include, without limitation, Calix’s expectations 
concerning the outlook for its business, productivity, plans and goals for future operational improvements and capital investments, operational 
performance, future market conditions or economic performance and developments in the capital and credit markets and expected future 
financial performance. 

Forward-looking statements involve a number of risks, uncertainties and assumptions, and actual results or events may differ materially 

from those projected or implied in those statements. Important factors that could cause such differences include, but are not limited to: 

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our ability to predict our revenue and plan our expenses appropriately;

the capital spending patterns of communications service providers ("CSPs"), and any decrease or delay in capital spending 
by CSPs due to economic, regulatory or other reasons;

the impact of government-sponsored programs on our customers;

intense competition;

our ability to develop new products or enhancements that support technological advances and meet changing CSP
requirements;

our ability to achieve market acceptance of our products and CSPs’ willingness to deploy our new products;

the concentration of our customer base;

the length and unpredictability of our sales cycles;

our focus on CSPs with limited revenue potential;

our lack of long-term, committed-volume purchase contracts with our customers;

our ability to increase our sales to larger North American as well as international CSPs;

our exposure to the credit risks of our customers;

fluctuations in our gross margin;

the interoperability of our products with CSP networks;

our dependence on sole and limited source suppliers;

our ability to manage our relationships with our contract manufacturers;

our ability to forecast our manufacturing requirements and manage our inventory;

our products’ compliance with industry standards;

our ability to expand our international operations;

our inability to recruit or retain appropriate resellers may reduce our sales and thus harm our business;

the ability to address and resolve risks related to acquisitions;

our ability to protect our intellectual property and the cost of doing so;

the quality of our products, including any undetected hardware errors or bugs in our software;

our ability to estimate future warranty obligations due to product failure rates;

our ability to obtain necessary third-party technology licenses;

any obligation to issue performance bonds to satisfy requirements under the U.S. Department of Agriculture’s Rural Utility 
Service ("RUS"), contracts;

the attraction and retention of qualified employees and key personnel;

our ability to build and sustain the proper technology infrastructure; and

our ability to maintain proper and effective internal controls.

Calix cautions you against placing undue reliance on forward-looking statements, which reflect our current beliefs and are based on 
information currently available to us as of the date a forward-looking statement is made. Forward-looking statements set forth herein speak 
only as of the date of this report on Form 10-K. We undertake no obligation to revise forward-looking statements to reflect future events, 
changes in circumstances, or changes in beliefs. In the event that we do update any forward-looking statements, no inference should be made 
that we will make additional updates with respect to that statement, related matters, or any other forward-looking statements. 

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PART I 

ITEM 1. Business

Overview 

Calix (together with its subsidiaries, “Calix,” the “Company,” “our,” “we,” or “us”) was incorporated in August 1999, and is a 
Delaware corporation. We are a leading provider in North America of broadband communications access systems and software for fiber- and 
copper-based network architectures that enable communications service providers ("CSPs"), to transform their networks and connect to their 
residential and business subscribers. We enable CSPs to provide a wide range of revenue-generating services, from basic voice and data to 
advanced broadband services, over legacy and next-generation access networks. We focus solely on CSP access networks, the portion of the 
network that governs available bandwidth and determines the range and quality of services that can be offered to subscribers. We develop and 
sell carrier-class hardware and software products, which we refer to as the Unified Access portfolio that are designed to enhance and 
transform CSP access networks to meet the changing demands of subscribers rapidly and cost-effectively. 

Our Unified Access portfolio consists of four core platforms and/or nodes, the B6 Ethernet service access nodes ("B-Series nodes"), the 

C7 multiservice, multiprotocol access platform ("C-Series platform"), the E-Series Ethernet service access platforms and nodes ("E-Series 
platforms and nodes"), and the BLM1500 gigabit passive optical network ("GPON") access terminal. These platforms, nodes, and terminals 
are complemented by the P-Series and T-Series optical network terminals ("ONTs") and residential gateways ("RGs"), and the Calix 
Management System ("CMS"), Entriview element management software, and Compass suite of value-added software applications. Our broad 
and comprehensive portfolio serves the CSP network from the central office or data center to the subscriber premises and enables CSPs to 
deliver both basic voice and data and advanced broadband services over legacy and next-generation access networks. These packet-based 
platforms enable CSPs to rapidly introduce new revenue-generating services, while minimizing the capital and operational costs of CSP 
networks. The Unified Access portfolio allows CSPs to evolve their networks and service delivery capabilities at a pace that balances their 
financial, competitive and technology needs. 

We believe that the rapid growth of Internet and data traffic, introduction of bandwidth-intensive advanced broadband services, such as 
high-speed Internet, Internet protocol television ("IPTV"), mobile broadband, high-definition video, and online gaming, and the increasingly 
competitive market for residential and business subscribers are driving CSPs to invest in and upgrade their access networks. We also believe 
that CSPs will gradually transform their access networks to deliver these advanced broadband services over fiber-based networks, thereby 
preparing networks for continued bandwidth growth, the introduction of new services and more cost-effective operations. During this time, 
CSPs will increasingly deploy new fiber-based network infrastructure to enable this transition while continuing to support basic voice and 
data services over legacy networks. Our portfolio is designed to enable this evolution of the access network efficiently and flexibly. 

We market our access systems and software to CSPs globally through our direct sales force as well as a limited number of resellers. As 

of December 31, 2012, over sixteen million ports of our Unified Access portfolio have been deployed at more than 1,150 CSPs worldwide, 
whose networks serve over 100 million subscriber lines in total. Our customers include many of the world's largest communications 
providers. In addition, we have over 425 commercial video customers and have enabled over 750 customers to deploy gigabit passive optical 
network, Active Ethernet and point-to-point Ethernet fiber access networks. 

We have a single reporting segment. Additional information about geographic areas required by this item is incorporated herein by 

reference to Note 12, “Segment Information” of the Notes to Consolidated Financial Statements of this Form 10-K. 

Industry Background 

CSPs compete in a rapidly changing market to deliver a range of voice, data and video services to their residential and business 
subscribers. CSPs include wireline and wireless service providers, cable multiple system operators ("MSOs"), electrical cooperatives, and 
municipalities. The rise in Internet-enabled communications has created an environment in which CSPs are competing to deliver voice, data 
and video offerings to their subscribers across fixed and mobile networks. Residential and business subscribers now have the opportunity to 
purchase an array of services such as basic voice and data as well as advanced broadband services such as high-speed Internet, IPTV, mobile 
broadband, high-definition video and online gaming from a variety of CSPs. The rapid growth in new services is generating increased 
network traffic. 

For example, Cisco Systems, Inc. estimates that global IP traffic will grow at a compound annual growth rate of 32% per year from 

2010 to reach approximately 80.5 exabytes per month in 2015. We believe that increased network traffic will be largely driven by video 
applications, which is expected to account for over 90% of global consumer traffic by 2015. CSPs are also broadening their offerings of 
bandwidth-intensive advanced broadband services, while maintaining support for their widely utilized basic voice and data services. CSPs are 
being driven to evolve their access networks to enable cost-effective delivery of a broad range of services demanded by their subscribers. 

With strong subscriber demand for low latency and bandwidth-intensive applications, CSPs are seeking to offer new services, realize 
new revenue streams, build out new infrastructure and differentiate themselves from their competitors. CSPs typically compete on their cost 
to acquire and retain subscribers, the quality of their service offerings and the cost to deploy and operate their networks. In the past, CSPs 
offered different solutions delivered over distinct networks designed for specific services and were generally not in direct competition. For 
example, traditional wireline service providers provided voice services whereas cable MSOs delivered cable television services. Currently, 
CSPs are increasingly offering services that leverage Internet protocol ("IP"), thereby enabling CSPs of all types to offer a comprehensive 
bundle of IP-based voice, data and video services to their subscribers. This has increased the level of competition among CSPs as wireline 
and wireless service providers, cable MSOs and other CSPs can all compete for the same residential and business subscribers using similar 
types of IP-based services. 

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Access Networks are Critical and Strategic to CSPs and Policymakers 

Access networks, also known as the local loop or last mile, directly and physically connect the residential or business subscriber to the 

CSP’s central office or similar facilities. The access network is critical for service delivery as it governs the bandwidth capacity, service 
quality available to subscribers and ultimately the services CSPs can provide to subscribers. Providing differentiated, high-speed, high quality 
connectivity has become increasingly critical for CSPs to retain and expand their subscriber base and to launch new services. Typically, 
subscribers consider service breadth, price, ease of use and technical support as key factors in the decision to purchase services from a CSP. 
As CSPs face increasing pressure to retain their basic voice and data customers in response to cable MSOs offering voice, data and video 
services, it is critical for CSPs to continue to invest in and upgrade their access networks in order to maintain a compelling service offering, 
drive new revenue opportunities and maintain and grow their subscriber base. Access networks can meaningfully affect the ongoing success 
of CSPs. 

Governments around the world recognize the importance of expanding broadband networks and delivering advanced broadband 

services to more people and businesses. For example, in February 2009, the U.S. government passed the American Recovery and 
Reinvestment Act ("ARRA"), which set aside approximately $7.2 billion as Broadband Stimulus funds for widening the reach of broadband 
access across the United States, a portion of which includes broadband access equipment. These funds, distributed in the form of grants, loans 
and loan guarantees, primarily target wireline and wireless service providers operating in rural, unserved and underserved areas in the United 
States. Many CSPs have actively pursued stimulus funds and have submitted various proposals to receive assistance for their broadband 
access infrastructure projects. Awards for these projects have been issued between December 2009 and September 2010. The timetable for 
completion of funded projects varies between the two agencies administering the awards. Projects funded under the Broadband Technology 
Opportunities Program ("BTOP"), which is administered by the National Telecommunications and Information Administration ("NTIA"), 
must be completed by September 30, 2013. Projects funded under the Broadband Initiatives Program ("BIP"), which is administered by the 
Rural Utilities Service, must be completed by June 30, 2015. 

Limitations of Traditional Access Networks 

CSPs rely on the capabilities and quality of their access networks to sustain their business and relationships with their subscribers. In 
the past, subscribers had little influence over the types of services provided by CSPs. Today, subscribers can be more selective among CSPs 
and they are increasingly demanding advanced broadband services in addition to basic voice and data services. In general, access networks 
are highly capital intensive and CSPs have historically upgraded capacity as technology and subscriber demands on their networks changed. 
We believe CSPs will increasingly integrate fiber-and Ethernet-based access networks to enable the delivery of more advanced broadband 
services at a lower cost while at the same time enabling the continued delivery of basic voice and data services. Thus far, CSPs have taken an 
incremental approach to capacity upgrades in their access networks. As a result CSPs face multiple challenges concerning their access 
networks, business models and service delivery capabilities, including: 

•  A Complex Patchwork of Networks and Technologies—In order to upgrade their access networks CSPs have typically added 

networks for new residential or business services that they deliver, such as digital subscriber line ("DSL"), data over cable service 
interface specification ("DOCSIS"), GPON or Gigabit Ethernet on top of existing networks. This led to an overbuild of access 
technologies and an unnecessarily complex patchwork of physical connections between the central office and the subscriber. In 
addition, CSPs have generally begun to expand the penetration of fiber into their access networks, thereby shortening the length of 
the subscriber connection through other lower bandwidth media types (such as copper-based or coaxial cable-based networks). 
CSPs have also attempted to evolve their access networks to enable more efficient packet-based services by adding Ethernet 
protocols on top of existing asynchronous transfer mode ("ATM"), and DSL protocols. In addition, CSPs have often deployed 
separate equipment to facilitate the delivery of Synchronous Optical Networking ("SONET"), Gigabit Ethernet and 10 Gigabit 
Ethernet transport, which connects CSP central offices with their access networks, further increasing the complexity and the cost 
of their networks. This approach has left most CSPs with disparate architectures, features, functions and capabilities in different 
parts of their networks. This increasingly complex, patchwork approach to deploying access networks and delivering new services 
to their subscribers has created potential complications for CSPs within their access networks. These potential complications limit 
data transmission capability, increase the cost of operation and maintenance and can negatively impact the subscriber experience.

•  Limited Capacity from Legacy Access Architectures—Legacy access network architectures were designed to address earlier 
generation communication demands of wireline telephone, cable television and cellular services. Such access networks have 
physical limitations in their ability to scale bandwidth, avoid latency issues and deliver advanced broadband services, which 
subscribers demand today and are expected to increasingly demand in the future. In addition, CSPs understand the need to add 
fiber to their networks to provide the bandwidth required to scale advanced broadband services. However, it is costly and complex 
to integrate fiber-based technologies into legacy access networks. 

• 

• 

Inflexible Technologies Increase Network Switching Costs—Legacy access networks were architected around a narrow set of 
technologies. For example, traditional voice calls use circuit switching technology to allocate a fixed amount of network capacity 
to each call, regardless of whether such capacity is fully utilized. The emergence of packet-based technologies, primarily IP and 
Ethernet, has significantly improved the ability to transmit data efficiently across networks as bandwidth is only consumed when 
signals are actually being transmitted. Most legacy access networks do not allow circuit- and packet-based technologies to co-exist 
or to evolve from one technology to another. 

Inefficient Service Roll-out Constrains Subscriber Offerings—Legacy access networks were designed to support a narrow range of 
services and as a result, they limit the ability of CSPs to provision the advanced broadband services increasingly demanded by 
their subscribers. Packet-based networks are more flexible and efficient than traditional circuit-switched networks. For example, to 
provision additional business services in a legacy access network, a CSP would typically deploy additional physical connections 
and equipment, whereas packet-based infrastructure allows a CSP to change or add services virtually, without the presence of a 

6

service technician or the installation of new equipment. In order to deploy these services quickly and efficiently, CSPs must be 
able to utilize their existing infrastructure while upgrading the legacy access network to packet-based technologies. 

•  Highly Reliable Access Products are Difficult to Engineer and Manage—Given the critical nature of access networks and their 
typical deployment in remote and distant locations, access infrastructure products must be highly reliable. Unlike most other 
communications equipment which is deployed in environmentally controlled central offices or similar facilities, most access 
equipment is deployed in outdoor environments and must be specifically engineered to operate in variable and often extremely 
harsh conditions, as well as fit into smaller spaces, such as on a street corner, near office buildings or on the side of a house or 
cellular tower. Since the access portion of the network is broadly distributed, it is expensive as well as difficult to manage and 
maintain. CSPs require access network equipment that can perform reliably in these uncontrolled environments and be deployed in 
a variety of form factors, thereby adding significant engineering and product development challenges as compared to most other 
forms of communications infrastructure equipment. In addition, some portion of the access market is supported by government 
initiatives and products sold into this segment require additional government certifications and approvals in order to qualify for 
deployment. 

•  Expensive to Deploy and Operate—As a result of deploying multiple networks with discrete functions, legacy access networks 

require a wide variety of equipment to be installed, maintained and ultimately replaced, thereby placing a significant and recurring 
capital and operating expense burden on the CSP. Once installed, this equipment occupies valuable space inside a central office 
(increasingly referred to as a data center by CSPs), requires frequent labor-intensive maintenance and consumes meaningful 
amounts of power. Moreover, the lack of integration across protocols and fiber- and copper-based network architectures negatively 
impacts network performance. Inferior network performance diminishes the subscriber experience and increases network 
operating costs by increasing service calls, the number of required support staff and the frequency of equipment upgrades and 
replacements. As broadband network availability and quality are becoming more critical to subscribers, lack of network reliability 
can be materially disruptive, expensive and ultimately increase subscriber churn, thereby negatively impacting the CSP’s business. 

Given these limitations of legacy access networks, we believe CSPs will increasingly emphasize fiber- and Ethernet-based technologies 

in their access networks thereby enabling the rapid, cost-effective deployment of advanced broadband services. Such technologies reduce 
overhead expenses, simplify network architectures and seamlessly integrate legacy and next-generation networks. We therefore believe that 
successful CSPs will be those that evolve from providing basic subscriber connectivity to providing the most relevant services and subscriber 
experience. 

The Calix Solution 

We are a leading provider in North America of broadband communications access systems and software for fiber- and copper-based 
network architectures that enable CSPs to connect to their residential and business subscribers. Our Unified Access Infrastructure portfolio 
enables CSPs to quickly meet subscriber demands for both basic voice and data as well as advanced broadband services, while providing 
CSPs with the flexibility to optimize and transform their networks at a pace that balances their financial, competitive and technology needs. 
Our systems and software leverage packet-based technologies that enable CSPs to offer a wide range of revenue-generating services, from 
basic voice and data to advanced broadband services regardless of protocol or network connection media. Our Unified Access Infrastructure 
portfolio consists of our B-Series nodes, our C-Series platform, our E-Series platforms and nodes, and the BLM1500 gigabit passive optical 
network access terminal. These platforms, nodes, and terminals are complemented by the P-Series and T-Series optical network terminals and 
residential gateways, the CMS, Entriview element management software, and the Compass suite of value-added software applications.

We believe that our Unified Access portfolio of network and premises-based solutions provides the following benefits to CSPs: 

  •  Single Unified Access Network for Basic and Advanced Services - Our Unified Access portfolio allows for a broad range of 

subscriber services to be provisioned and delivered over a single unified network. These systems can deliver basic voice and data, 
advanced broadband services, including high-speed Internet, IPTV, mobile broadband, high-definition video and online gaming, as 
well as integrated transport within our Unified Access portfolio, all of which can be monitored and managed by CMS. The newly 
acquired BLM1500 terminals and its management system, Entriview, are currently being integrated with CMS. In addition, our 
systems can be deployed in both small and large form factors across multiple deployment scenarios depending on subscriber 
proximity and service requirements. Our multiservice approach allows CSPs to utilize their legacy access networks during the 
course of their equipment upgrade and network migration, saving them time and money in delivering both basic voice and data 
and advanced broadband services. 

  •  High Capacity and Operational Efficiency - Our Unified Access portfolio is designed to facilitate the evolution of CSP access 
networks to fiber- and Ethernet-based network architectures. Our portfolio includes platforms that exceed the capacity of the 
products of our most direct competitors. Our platforms are designed and optimized for fiber- and copper-based network 
architectures. We also have a broad portfolio of feature-rich fiber ONTs that serve as the on-premises gateways for new services to 
subscribers. Our extended reach GPON offers our customers greater capacity and operational efficiencies, including the ability to 
reach subscribers further away from a CSP’s central office, thereby also allowing CSPs to consolidate multiple central offices and 
further reduce operating expense. Furthermore, our ONTs auto-detect fiber access technologies supporting both GPON and point-
to-point Gigabit Ethernet and provide CSPs additional cost and management efficiencies. 

  •  Highly Flexible Technology Solutions - Our Unified Access portfolio enables CSPs to utilize legacy access network infrastructure 
during their migration towards fiber- and Ethernet-based access networks. Our portfolio supports multiple protocols, different 
form factors and modular options optimized for a variety of installation locations and environments and multiple services 
delivered over fiber- and copper-based network architectures. 

  •  Seamless Transition to Advanced Services - Our Unified Access portfolio enables CSPs to better manage the evolution of their 
access networks by transitioning the delivery of basic voice and data services to advanced broadband services. Our C-Series 

7

platform supports ongoing demand for basic voice and data services and facilitates a seamless and controlled migration to IP-
based services. For CSPs without legacy network constraints, our B-Series nodes and E-Series platforms, and our BLM1500 
terminals allow CSPs to deploy advanced broadband services rapidly and cost effectively to their subscribers. 

  •  Highly Reliable and Purpose-Built Solutions for Demands of Access - Our Unified Access portfolio is designed for high 

availability and purpose-built for the demands of access network deployments. Our carrier-class products are predominantly 
environmentally hardened and field-tested to be capable of withstanding harsh environmental conditions, including temperatures 
between -40 and 65 degrees Celsius, extremely dry or wet conditions and physical abuse. Our access systems are built and tested 
to meet or exceed network equipment-building system standards, which are a set of safety, spatial and environmental design 
guidelines for telecommunications equipment. Our products are highly compatible and designed to be easily integrated into the 
existing operational and management infrastructure of CSP access networks. Our portfolio can be deployed in multiple form 
factors and power configurations to address a wide range of deployment scenarios influenced by space and power constraints. 

  •  Compelling Customer Value Proposition - We believe our Unified Access portfolio offers CSPs a compelling value proposition. 
Our portfolio provides CSPs the flexibility to upgrade their networks over time, reduce operational costs and maximize their 
return on capital expenditures. Our packet-based platforms enable CSPs to offer new services more quickly and generate new 
revenue opportunities. We believe the interoperability and compatibility of our portfolio reduces the complexity and cost of 
managing CSP networks. 

Our Strategy 

Our Unified Access portfolio enables the delivery of basic voice and data and advanced broadband services, across multiple protocols 
and form factors over fiber- and copper-based network architectures. Our objective is to leverage our Unified Access portfolio to become the 
leading supplier of access systems and software that enable CSPs to transform their networks and business models to meet the changing 
demands of their subscribers. The principal elements of our strategy are:

  •  Continue Our Sole Focus on Access Systems and Software - Our dedicated focus on access has been an important driver of our 
success with our customers. We believe our focus has allowed us to develop innovative access systems and a highly efficient 
service and deployment model that have been widely implemented by CSPs. Virtually all of our large competitors in the access 
market devote some percentage of their resources to products outside of the access network, and in some cases, products not even 
designed for CSPs. We intend to continue to focus our efforts on the access market, which we believe will enable us to continue to 
deliver compelling, timely and innovative access solutions to CSPs.

  •  Continue to Enable our Customers to Transform Their Networks and Business Models - We believe that residential and 

business subscribers are pressuring CSPs to expand their offerings through the delivery of superior subscriber experiences. In 
response, CSPs need to transform their networks and business models by rapidly provisioning new services while minimizing the 
capital and operational costs of their networks. We believe our Unified Access portfolio enables CSPs to introduce new revenue-
generating services as demanded by their subscribers.

  •  Continue to Engage Directly with Customers - We operate a differentiated business model focused on aligning with our 

customers, predominantly through direct engagement, service and support. Our direct customer engagement model allows us to 
target our sales resources as well as align our product development efforts closely to our customers' needs. Our direct engagement 
model is a key differentiator for our business and is critical to our continued market leadership. Although we do utilize resellers in 
some markets, particularly in international markets, our practice is to sell along-side the reseller and maintain the benefits of a 
close customer relationship.

  •  Leverage our Growing Customer Footprint - As of December 31, 2012, over sixteen million ports of our Unified Access portfolio 
have been deployed at more than 1,150 CSPs worldwide, whose networks serve over 100 million subscriber lines in total. Our 
customers include many of the world's largest communications providers. This footprint provides us with the opportunity to sell 
additional components of our Unified Access portfolio to existing customers. For example, the vast majority of our existing 
customers have purchased additional line cards and other products from us after their initial purchase. We have also demonstrated 
that our footprint, combined with the flexibility of our portfolio, gives us incumbency benefits to sell complementary or new 
offerings in the future. For instance, within three quarters of the introduction of our first E7 platform in the first quarter of 2010, 
we had exceeded 150 of our customers having purchased E7 platforms-the majority of whom already were deploying our B-Series 
nodes or C-Series platforms to deliver complementary services to their subscribers.

  •  Expand Deliberately into New Market and Applications - We believe that a disciplined approach to targeting markets and 

applications is critical to our long-term success. For example, we initially focused on rural ILECs and have achieved an industry 
leadership position as the majority of U.S. Independent Operating Companies ("IOCs"), have deployed our access systems and 
software. We have also recently entered new geographic markets, including Africa, Asia, Australia, Europe, and Latin America. 
These deployments complement our now significant deployments in Canada and the Caribbean. We will continue our disciplined 
approach of targeting new markets and applications in which we believe our products will rapidly gain customer adoption. For 
example, we are targeting additional markets for our fiber access solutions, including the mobile backhaul and cable business 
services markets.

  •  Pursue Strategic Relationships, Alliances and Acquisitions - We intend to continue to pursue strategic technology and 

distribution relationships, alliances and acquisitions that align us with CSPs' strategic direction to increase revenue-generating 
services while reducing the cost to deploy and operate their access networks. We believe these relationships, alliances and 
acquisitions will allow us to grow our footprint and enhance our ability to sell our access systems and software. We developed and 
invested in the Calix Compatible Program to assure interoperability across the ecosystem of the majority of vendors critical for 
implementing and delivering new advanced broadband services. This program has approximately 67 technology members to date 

8

and enables our customers to rapidly deploy proven solutions in their access networks. We work with Ericsson Inc. (“Ericsson”) 
and Juniper Networks, Inc. to provide advanced broadband solutions globally and have partnered with Microsoft to ensure 
successful interoperation between our products and its Mediaroom IPTV application. In addition, our acquisitions of Optical 
Solutions, Inc. ("OSI") in 2006 and Occam Networks, Inc. ("Occam") in 2011, and our acquisition of fiber access assets from 
Ericsson in November 2012, have provided us with leading copper and fiber access technologies that have been integrated into our 
Unified Access portfolio. 

Acquisition of Ericsson's Fiber Access Assets ("EFAA Acquisition")

On November 2, 2012, we acquired the fiber access assets of Ericsson, including the Ericsson EDA 1500 GPON solution and its 
complementary ONT portfolio, under an Asset Purchase Agreement that we entered into on August 20, 2012. Total consideration for the 
purchase was $12.0 million in cash. As a result of this acquisition, Calix hired 50 U.S.-based employees of Ericsson, and transitioned ongoing 
support of the acquired products from Ericsson to Calix. 

We expect this acquisition to deliver powerful new complements to our industry-leading Unified Access portfolio. In connection with 

this acquisition, Calix and Ericsson also signed a non-exclusive global reseller agreement, under which Calix will become Ericsson's 
preferred global partner for broadband access applications. We expect this partnership to provide Calix with an extensive new global reseller 
channel, and we believe our acquisition of Ericsson's fiber access portfolio delivers powerful new complements to our industry-leading 
Unified Access portfolio. We believe this partnership will also provide Ericsson's existing fiber access customers with world-class support 
and maintenance, and an expanded portfolio of access systems and software from a leading company totally focused on access. 

Customers 

We operate a differentiated customer engagement model that focuses on direct alignment with our customers through sales, service and 

support. In order to allocate our product development and sales efforts efficiently, we believe that it is critical to target markets, customers 
and applications deliberately. We have traditionally targeted CSPs, which own, build and upgrade their own access networks and which also 
value strong relationships with their access systems and software suppliers. 

As of December 31, 2012, we had more than 1,150 customers, the majority of which are based in the United States. The U.S. ILEC 

market is composed of three distinct “tiers” of carriers, which we categorize based on their subscriber line counts and geographic coverage. 
Tier 1 CSPs are very large with wide geographic footprints. They have greater than five million subscriber lines and they generally 
correspond with the former Regional Bell Operating Companies. Tier 2 CSPs also operate typically within a wide geographic footprint, but 
are smaller in scale, with subscriber lines that range from approximately half a million subscriber lines to approximately five million 
subscriber lines. Their service coverage areas are predominantly regional in scope and therefore are often known as Regional Local Exchange 
Carriers ("RLECs"). Tier 3 CSPs consist of over 1,000 predominantly local operators typically focused on a single or a cluster of 
communities. Often called IOCs, they range in size from a few hundred to approximately half a million subscriber lines. Because of 
similarities in subscriber line size and focused market footprint, we typically include Competitive Local Exchange Carriers and municipalities 
in this market segment. 

To date, we have focused primarily on CSPs in the North American market. Our existing customers' networks serve over 100 million 

subscriber lines. A representative Tier 1 customer is CenturyLink, Inc. ("CenturyLink"). Representative Tier 2 customers include Frontier, 
Windstream Corp., Fairpoint, and TDS Telecommunications Corporation. Our Tier 3 CSP customers have historically accounted for a large 
percentage of our sales. We also serve new entrants to the access services market who are building their own access networks, including cable 
MSOs, such as Cox Communications, and municipalities. Moreover, we have entered new geographic markets, such as Africa, Asia, 
Australia, Europe, and Latin America that complement our significant market presence in Canada and the Caribbean. We anticipate that we 
will continue to target CSPs globally as part of our expansion strategy. 

We have a few large customers who have represented a significant portion of our sales in any given period. In 2012, 2011, and 2010, 

we had one such customer, CenturyLink, who accounted for 21%, 20%, and 29% of our revenue, respectively. 

Some of our customers within the United States use or expect to use government-supported loan programs or grants to finance capital 

spending. Loans and grants through RUS, which is a part of the United States Department of Agriculture, are used to promote the 
development of telecommunications infrastructure in rural areas. In addition, the Broadband Stimulus initiatives under the ARRA have also 
made funds available to certain of our customers. 

Sales to customers outside of the United States represented approximately 7%, 6%, and 15% of our revenues for the years ended 

December 31, 2012, 2011, and 2010, respectively. To date, our sales outside of the United States have predominantly been to customers in 
Canada and the Caribbean. 

Customer Engagement Model 

We market and sell our access systems and software predominantly through our direct sales force, supported by marketing and product 
management personnel, although we have recently expanded this model to include resellers both in North America and globally, including a 
global reseller relationship with Ericsson. Our sales effort is organized either by named accounts or regional responsibilities. Account teams 
comprise sales managers, supported by sales engineers and account managers, who work to target and sell to existing and prospective CSPs. 
The sales process includes analyzing their existing networks and identifying how they can utilize our products within their networks. We also 
offer advice regarding eligibility and also support proposals to the appropriate agencies when we are a material supplier. Even in 
circumstances where a reseller is involved, our sales and marketing personnel are often selling side-by-side with the reseller. We believe that 
our direct customer engagement approach provides us with significant differentiation in the customer sales process by aligning us more 
closely with our customers' changing needs. 

9

As part of our sales process, CSPs will usually perform a lab trial or a field trial of our access systems prior to full-scale commercial 
deployment. This is most common for CSPs purchasing a particular access system for the first time. Upon successful completion, the CSP 
generally accepts the lab and field trial equipment installed in its network and may continue with deployment of additional access systems. 
Our sales cycle, from initial contact with a CSP through the signing of a purchase agreement, may, in some cases, take several quarters. 

Typically our customer agreements contain general terms and conditions applicable to purchases of our access systems and software. 
By entering into a customer agreement with us, a customer does not become obligated to order or purchase any fixed or minimum quantities 
of our access systems and software. Our customers generally order access systems and software from us by submitting purchase orders that 
describe, among other things, the type and quantities of our access systems and software that they desire to order, the delivery and installation 
terms and other terms that are applicable to our access systems and software. Customers who have been awarded RUS loans or grants are 
required to contract under form contracts approved by RUS. 

Our direct customer engagement model extends to service and support. Our service and support organization works closely with our 
customers to ensure the successful installation and ongoing support of our Unified Access portfolio. Our service and support organization 
provides technical product support and consults with our customers to address their needs. We offer our customers a range of support 
offerings, including program management, training, installation and post-sales technical support. As a part of our pre-sales effort, our 
engineers design the implementation of our products in our customers’ access networks to meet our customers’ performance and 
interoperability requirements. Although some of our reseller arrangements allow resellers to provide support, training, installation, and post-
sales technical support, these resellers still rely heavily on us to provide support to the customer. 

Our U.S.-based technical support organization offers support 24 hours a day, seven days a week. With an active Calix Advantage 
agreement, customers receive a license to CMS, access to telephone support and online technical information, software product upgrades and 
maintenance releases, advance return materials authorization and on-site support, if necessary. Calix Advantage agreement are renewable on 
an annual basis. Most of our customers renew their Calix Advantage agreement. In addition, we offer extended warranty services for our 
products in one to five-year durations, which include the right to warranty coverage beyond the standard warranty period. For customers not 
under a Calix Advantage agreement or who have not purchased extended warranty services, product support and warranty services are 
provided for a fee on a per-incident basis. 

Products and Technology 

We develop, sell and support carrier-class hardware and software products, which we refer to as our Unified Access portfolio. Our 
Unified Access portfolio enables CSPs to deliver both basic voice and data and advanced broadband services over legacy and next-generation 
access networks. Our Unified Access portfolio consists of the following key features: 

  •  Broad Product Offering — We offer a comprehensive portfolio of access systems and software that is deployed in the portion of 
the network that extends from the data center, central office, or similar facilities to a subscriber's premises. We sell our access 
systems in a variety of form factors, modular options and configurations that are important to CSPs. Our network-based products 
include our B-Series nodes, which provides multiservice over Ethernet via distributed nodes, our C-Series platform, which is our 
multiservice, multiprotocol access platform, and our Ethernet-focused E-Series platforms, which provide cost-effective, flexible 
service delivery of IP-based services. Our premises-based offering consists of our P-Series and T-Series ONTs and residential 
gateways, which are deployed in combination with our B-Series, C-Series and E-Series platforms and nodes, as well as the 
BLM1500 terminal. We offer an extensive line of ONTs and residential gateways to enable our customers to connect to their 
subscribers across a diverse set of form factors, protocols and functionality requirements. 

  •  Multiservice and Multiprotocol — We develop our products and an extensive offering of service interfaces to ensure CSPs can 

connect to their subscribers to enable the delivery of basic voice and data or advanced broadband services over fiber- and copper-
based network architectures regardless of protocol. Our C-Series platform also enables CSPs to integrate IP and legacy protocols 
as well as the integration of fiber- and copper-based connectivity in a single chassis. In doing so, the C-Series platform allows 
CSPs to evolve their access infrastructures over time. Our B-Series nodes and E-Series platforms and nodes are multiservice but 
focus solely on Ethernet. Our B-Series nodes are focused on CSPs using Ethernet over copper and fiber and a distributed 
architecture to transform their networks. Our E-Series platforms and nodes are well suited for CSPs who are using Ethernet to 
transform their networks. Our B-Series, C-Series, and E-Series platforms and nodes are often, but not required to be, deployed 
together so that the C-Series platform can act as a protocol gateway for our B-Series and E-Series platforms and nodes. 

  •  Common Operating System Kernel — All of our access systems are interoperable and are designed to be easily deployed and 

managed together as a single, unified access network. The C7, E7 and the E5-400 utilize a common Ethernet kernel, which we 
refer to as the Ethernet eXtensible Architecture ("EXA"), which was developed based on industry standard protocols and focused 
on the needs of the access network. Because our core platforms leverage this common operating system kernel, we can develop, 
test and introduce new access systems and software rapidly, and enable our customers to deploy advanced broadband services at 
their desired pace. 

  •  Unified Network Management — Our CMS is server-based network management software capable of overseeing and managing 

multiple B-Series, C-Series, and E-Series networks. In addition, CMS performs all provisioning, maintenance and troubleshooting 
operations across disparate access technologies and networks through a common user interface. This enables CSPs to manage and 
unify the various elements of our Unified Access portfolio as a single, scalable platform. CMS is often integrated by our customers 
with their back-office systems for billing and provisioning. Entriview, the element management system for the BLM1500, is in the 
process of being integrated with CMS. 

Our Unified Access portfolio allows CSPs to transform their legacy and mixed protocol access networks to fiber and Ethernet over 

time. CSPs often deploy our B-Series nodes, C-Series, and/or E-Series platforms, and our BLM1500 together in data centers, central offices, 

10

or similar facilities to interconnect data centers and central offices. Our C-Series platform can act as a protocol gateway when deployed with 
our B-Series and E-Series platforms and nodes. Our B-Series and E-Series platforms and nodes can be deployed either in data centers, central 
offices, remote network locations, existing cabinets or in customer premises locations depending upon the CSP's requirements. All of our B-
Series, C-Series and E-Series platforms and nodes interoperate with and can terminate network traffic from our P-Series ONTs. Calix is 
working towards having the recently acquired BLM1500 terminals interoperable with E-Series platforms, and able to support some P-Series 
ONTs and residential gateways. 

A graphic representation of how the various components of our Unified Access portfolio work together is shown in the network 

diagram below: 

The graphic above depicts how a CSP might deploy our Unified Access portfolio in a CSP network. The network is divided into five 

segments: (1) the routed core network, (2) the data center / central office, (3) the remote terminal, (4) the node and (5) the subscriber, business 
or multi-dwelling unit ("MDU"), premises. First, voice, video or data content is aggregated by a router in the network core and transferred to 
a B6, C7, or E7. The content is then sent around a redundant Ethernet transport ring, which operates using the 10 Gigabit Ethernet or Gigabit 
Ethernet standard. The ring consists of a variety of Calix access platforms or nodes, including the B6, C7, the E7 and the E5-400, each of 
which may be located in other central offices or in remote terminal locations closer to subscribers. Content can be pulled from any one of 
these locations and delivered either to a Calix platform located at a remote node or directly to a subscriber premises. In the case where 
content is delivered to another Calix platform, the content can be delivered over a variety of fiber-based technologies, such as 10 Gigabit 
Ethernet, Gigabit Ethernet or multiple Gigabit Ethernet, or NxGE. Delivery to the subscriber premises over fiber or copper transmission lines 
is the final part of the access network. Delivery over fiber lines uses GPON, point-to-point Ethernet services, and delivery over copper lines 
uses DSL services or plain old telephone service ("POTS"). Our CMS manages all aspects of the Unified Access portfolio and supports 
features that allow remote management of equipment across the network, including equipment at the subscriber premises. The BLM1500 
terminals and T-Series ONTs and residential gateways (not pictured) currently operate independent of the other Unified Access portfolio 
systems and are managed via the Entriview element management system, although we plan to enable them to interoperate with E-Series 
platforms and nodes and some P-Series ONTs and residential gateways, as well as CMS, in the future.

Calix B-Series Ethernet Service Access Nodes 

Our B-Series Ethernet service access nodes consist of chassis-based nodes that are designed to support an array of advanced IP-based 

services offered by CSPs. Our B-Series nodes are designed to be carrier-class and enable CSPs to implement advanced Ethernet transport and 
aggregation, as well as voice, data and video services over both fiber- and copper-based network architectures. Our B-Series nodes are 
environmentally hardened and can be deployed in a variety of network locations, including data centers, central offices, remote terminals, 
video headends and co-location facilities. In addition, due to the small size of some of our B-Series nodes, many can be installed in confined 
locations such as remote nodes and multi-dwelling units. As such, many of our B-Series nodes can be deployed in most competitor and other 
third-party cabinets, or as stand-alone sealed nodes in our access network. Our B-Series nodes are managed using our CMS and can be 
deployed in conjunction with our C-Series and E-Series platforms as well as our P-Series ONTs. We believe the deployment flexibility and 
Ethernet focus of our B-Series nodes make them well suited for CSPs extending Ethernet services and fiber closer to the subscriber premises. 

11

Our B6 has three form factors. Our B6-001 is a one rack unit chassis with one line card slot, whereas the B6-006 is a 7 rack unit chassis 

with six line card slots and the B6-012 is a 12 rack unit chassis with 20 service line card slots. Our B6s deliver Ethernet services over fiber, 
including a wide range of GPON, point-to-point Gigabit Ethernet, and 10 Gigabit Ethernet services. 

Key technology differentiators of the B-Series nodes are: 

  •  Multiservice over Ethernet—Our B-Series nodes enable CSPs to offer high bandwidth, advanced broadband and low latency 

services across Ethernet over fiber- and copper-based network architectures. 

  •  Deployment Flexibility—Our B-Series nodes are composed of three distinct form factor chassis between 1 and 12 rack units in 
height. The B-Series nodes are designed to deliver operational efficiencies without sacrificing deployment flexibility or service 
functionality. Our B-Series node options are optimally sized to deliver high bandwidth services from a data center, central office, 
remote terminal, remote node or MDU. For CSPs seeking additional flexibility and performance, the B6s can be combined with C-
Series and E-Series platforms and nodes, all of which are managed by our CMS. 

  •  High Capacity and Reliability—Our B-Series nodes have high data throughput capacity and are designed to meet the demanding 
bandwidth and low latency requirements of advanced broadband services for residential and business subscribers. Our B-Series 
nodes support a range of transport options from multiple 10 Gigabit Ethernet uplinks in each chassis down to redundant Gigabit 
Ethernet ports. The distributed intelligence of the B6s supports 10 gigabits per second in each deployed line card. The B6s also 
support T1 circuit emulation and are designed to be Metro Ethernet Forum (MEF 9 and MEF 14) compliant and to meet Network 
Equipment-Building System ("NEBS") requirements. 

  •  Broad Array of Advanced Services Support—Our B-Series nodes support a broad array of advanced services including up to 48 

VDSL2 and 48 ADSL2+ overlay or combination voice and DSL services ports as well as DSL port bonding on each line card, and 
offers multiple Gigabit Ethernet network uplinks. Our B6s also support a mix of GPON, point-to-point gigabit Ethernet and 
multiple Gigabit Ethernet and 10 Gigabit Ethernet ports. Line card options include a mix of GPON, point-to-point gigabit 
Ethernet, and 10 Gigabit Ethernet services, as well as traffic management and queuing, performance monitoring, and virtual local 
area network stacking to support quality of service. 

The following pictures depict the B-Series nodes: 

Calix C-Series Multiservice, Multiprotocol Access Platform 

Our C7 multiservice, multiprotocol access platform ("C-Series platform"), is designed to support a wide array of basic voice and data 

services offered by CSPs, while also supporting advanced, high-speed, packet-based services such as Gigabit Ethernet, GPON and DSL 
(including very high-speed digital subscriber line 2 ("VDSL2"), and asymmetrical digital subscriber line 2+ ("ADSL2+") and advanced 
applications like IPTV. In so doing, our C-Series platform facilitates network transformation by integrating the functions required to transport 
and deliver voice, data and video services over both fiber- and copper-based network architectures. Our C-Series platform is a chassis-based 
product with 23 line card slots, three of which are used for common logic, switching fabric and uplinks, with the remaining 20 slots available 
for any service interface card we offer. Our C-Series platform is managed using our CMS. Our high-capacity C-Series platform is flexible and 
is designed to be deployed in a variety of locations, including data centers, central offices, remote terminals, video headends and co-location 
facilities. Our C-Series platform leverages a common operating system kernel, the EXA, that it shares with most of our E-Series Ethernet 
service access platforms and nodes ("E-Series platforms and nodes"), allowing for common provisioning and facilitated platform 

12

interoperability. The multiprotocol and integrated transport capabilities of our C-Series platform allow it to be deployed as an aggregation or 
gateway device for our B-Series and E-Series platforms and nodes and P-Series ONTs. 

Key technology differentiators of the C-Series platform are: 

 •  Protocol Independent—Our C-Series platform enables the integration of multiple protocols through a system architecture where 

line cards perform specific protocol processing. 

  •  High Capacity—Our C-Series platform can enable up to 200 gigabits per second total throughput capacity. It can provide service 
delivery speeds of up to 10 gigabits per second in network transport rings or directly to subscribers, which is significantly greater 
than the bandwidth that CSPs are typically providing to their subscribers. This enables CSPs to scale their advanced broadband 
service offerings over time without the need to change their equipment. 

  •  Flexible Switching Architecture—Our C-Series platform supports a highly scalable switching architecture with characteristics 

similar to high performance routers. All services are converted to packets on line cards allowing our platform to natively switch 
circuits, cells and packets. As a result, both legacy and advanced packet-based services can be supported simultaneously or 
uniformly, allowing the C-Series to be deployed as a pure Ethernet delivery platform, a traditional service delivery platform or a 
hybrid services platform. 

  •  Density—In typical applications, a single 14-inch high C-Series platform shelf can terminate 480 copper-based subscriber 
connections, or up to 5,120 fiber-to-the premises, or FTTP, subscribers using GPON. This functionality allows up to 2,400 
subscribers of advanced broadband services over copper-based networks or over 25,000 subscribers over fiber-based networks to 
be served out of a single seven-foot rack in the central office. 

  •  Reduced Risk of Technological Obsolescence—As new services and technologies are introduced to the network, our flexible C-

Series architecture allows CSPs to add or swap line cards to introduce new functionality into the access system. New services such 
as IPTV and voice-over-Internet-protocol require new features like Internet Group Management Protocol channel change 
processing and protocol gateway support, which can easily be added without substantial changes to existing equipment. As a 
result, equipment purchased by CSPs can have longer useful lives, which can reduce CSPs’ capital expenditures. The C7 can also 
support IPTV. 

  •  Extensive Line Card Offering—Currently our C-Series platform offers 47 line cards that enable a diverse set of trunk and 

subscriber interfaces, ranging from basic voice service and specialized circuits to advanced broadband services such as packet-
based Fast and gigabit Ethernet, SONET (up to optical carrier-48, or OC-48), VDSL2 and ADSL2+ across multiple copper pairs 
and GPON. In addition, our C-Series platform supports multiple combinations of service interface cards in any slot at any time. 
We believe this flexibility provides CSPs the ability to evolve networks toward higher-capacity, packet-based service offerings in a 
minimally disruptive and cost-effective manner. 

The following pictures depict the C-Series platform and sample line cards: 

13

Calix E-Series Ethernet Service Access Platforms and Nodes 

Our E-Series Ethernet service access platforms and Ethernet service access nodes ("E-Series platforms and nodes"), consist of chassis-
based platforms as well as fixed form factor nodes that are designed to support an array of advanced IP-based services offered by CSPs. Our 
E-Series platforms and nodes are designed to be carrier-class and enable CSPs to implement advanced Ethernet transport and aggregation, as 
well as voice, data and video services over both fiber- and copper-based network architectures. Our E-Series platforms and nodes are 
environmentally hardened and can be deployed in a variety of network locations, including data centers, central offices, remote terminals, 
video headends and co-location facilities. In addition, due to the small size of many of our E-Series platforms, most can be installed in 
confined locations such as remote nodes and multi-dwelling units. As such, many of our E-Series platforms and nodes can be deployed in 
most competitor and other third-party cabinets, or as stand-alone sealed nodes in our access network. Our E-Series platforms and nodes are 
managed using our CMS and can be deployed in conjunction with our B-Series nodes, C-Series platform, and P-Series ONTs and residential 
gateways. We believe the deployment flexibility and Ethernet focus of our E-Series platforms and nodes make them well suited for CSPs 
extending Ethernet services and fiber closer to the subscriber premises. 

Our E7 has two form factors. Our E7-2 is a one rack unit chassis with two line card slots, whereas the E7-20 is a 13 rack unit chassis 

with two common control card slots and 20 service line card slots. Our E7s deliver Ethernet services over copper and fiber, including a wide 
range of GPON, point-to-point Gigabit Ethernet, VDSL2, and 10 Gigabit Ethernet services. Our other E-Series nodes include the fixed form 
factor E5-100 and E5-400 node families, as well as the E3-12C and E3-48 sealed Ethernet service access nodes, which collectively deliver 
high-speed broadband with interfaces that range from 10 Gigabit Ethernet transport and aggregation to ADSL2+, VDSL2, and point-to-point 
Gigabit Ethernet. 

Key technology differentiators of the E-Series platforms and nodes are: 

 •   Standards-Based Switching Architecture—Our E7 and E5-400 utilize a common Ethernet kernel, the EXA, that was developed 
based on industry standard protocols and focused on the needs of the access network. EXA facilitates cross network awareness, 
installation, management and provisioning for our C-Series platform and our E-Series platforms. 

  •  Multiservice over Ethernet—Our E-Series platforms and nodes enable CSPs to offer high bandwidth, advanced broadband and low 

latency services across Ethernet over fiber- and copper-based network architectures. 

  •  Deployment Flexibility—Our E-Series platforms and nodes are composed of eight distinct small form factor configurations 

between 1 and 1.5 rack units in height and a 13 rack unit large chassis. The E-Series platforms and nodes are designed to deliver 
operational efficiencies without sacrificing deployment flexibility or service functionality. Our E-Series platforms are optimally 
sized to deliver high bandwidth services from a data center, central office, remote terminal, remote node or MDU. For CSPs 
seeking additional flexibility and performance, the E7-2 is modular and stackable and can be combined with other E7s or other B-
Series, C-Series and E-Series platforms and nodes, all of which are managed by our CMS. Also managed by CMS, the E7-20 was 
built for the high capacity, low latency needs of the future. 

  •  High Capacity and Reliability—Our E-Series platforms and nodes have high data throughput capacity and are designed to meet the 
demanding bandwidth and low latency requirements of advanced broadband services for residential and business subscribers. Our 
E-Series platforms and nodes support a range of transport options from six 10 Gigabit Ethernet uplinks in each E7-2 chassis down 
to redundant Gigabit Ethernet in the E5-100 node family. Our chassis-based E7-2 supports a redundant 100 gigabits per second 
backplane in each deployable module with line cards that further support a minimum of 100 gigabits per second switching 
capacity. The E7-20 supports the same 100 gigabits per second line card switching capacity per card, but houses each card in a 20 
service line card slot chassis with a two terabits per second backplane. The E7 and the E5-400 also support transparent local area 
network services and are designed to be Metro Ethernet Forum compliant and to meet NEBS requirements. 

  •  Broad Array of Advanced Services Support—Our E-Series platforms and nodes support a broad array of advanced services. Our 
E5-100 node family supports up to 24 VDSL2 and 48 ADSL2+ overlay or combination voice and DSL services ports as well as 
DSL port bonding, and offers multiple Gigabit Ethernet network uplinks. Our E3-12C supports up to 12 VDSL2 combination 
voice and DSL services ports as well as DSL port bonding, and offers multiple Gigabit Ethernet network uplinks. Our E3-48 
supports up to 48 VDSL2 service ports as well as DSL port bonding and the capability for port vectoring, and offers multiple 10 
Gigabit Ethernet and 2.5 or single Gigabit Ethernet uplinks. Our E7 and the E5-400 support a mix of GPON, multiple Gigabit 
Ethernet and 10 Gigabit Ethernet ports. Line card options include a mix of GPON, point-to-point Gigabit Ethernet, 10 Gigabit 
Ethernet services, and in the case of the E7-2, 48 ports of VDSL2 combo services on a line card, which translates into an industry-
leading 96 VDSL2 combo ports in a 1 rack unit form factor, as well as traffic management and queuing, performance monitoring 
and virtual local area network stacking to support quality of service. 

14

The following pictures depict the E-Series platforms and nodes: 

Calix BLM1500 Gigabit Passive Optical Network Access Terminals 

Our BLM1500 GPON access terminals are chassis-based systems that are designed to support an array of advanced IP-based services 
offered by CSPs. Our BLM1500 terminals are designed to be carrier-class and enable CSPs to implement advanced services such as voice, 
data and video services over fiber-based network architectures. Our BLM1500 terminals are deployed in data centers and central offices and 
are managed using our Entriview element management system. Our T-Series ONTs and residential gateways are deployed with the BLM1500 
terminals. We believe the GPON and Ethernet focus of our BLM1500 terminals make them well suited for CSPs building large, carrier-class 
fiber access network. We launched our BLM1500 terminals in November 2012, following our acquisition of Ericsson's EDA 1500 GPON 
technology.

Our BLM1500 is a 17 rack unit chassis with two common control card slots and 18 service line card slots. Our BLM1500s deliver 

GPON-based Ethernet services over fiber. Key technology differentiators of the BLM1500 terminals are: 

  •  Multiservice over Ethernet—Our BLM1500 terminals enable CSPs to offer high bandwidth, advanced broadband and low latency 

GPON services across Ethernet over fiber-based network architectures. 

  •  High Capacity and Reliability—Our BLM1500 terminals have high data throughput capacity and are designed to meet the 

demanding bandwidth and low latency requirements of advanced broadband services for residential subscribers. Our BLM1500 
supports a 320 gigabits per second backplane and houses up to 18 service line cards, including both 4-port and 8-port GPON line 
cards. 

  •  Global Tier 1 Backoffice Integration—Our BLM1500 terminals and the Entriview element management system have been 

integrated into backoffice systems and deployed at dozens of Tier 1 CSPs globally.

15

The following picture depicts the BLM1500 terminals:

Calix P-Series Optical Network Terminals and Residential Gateways

Our P-Series ONTs and residential gateways consist of a broad range of customer premises solutions, including standards-based ONTs 
and residential gateways, for residential and business use in conjunction with our B-Series, C-Series, and E-Series platforms and nodes. Our 
P-Series ONTs and residential gateways can auto-detect the bandwidth of the network and enable CSPs to change line rates and features 
without expensive truck rolls or hardware replacements. Our family of ONTs and residential gateways is designed to support advanced 
broadband services, such as IPTV, RF video, business services and mobile backhaul (including Ethernet OAM support for conformance with 
service level agreements). The design and flexibility of the P-Series allows CSPs to lower initial capital expenditures as well as reduce 
operational costs. To meet the deployment and service requirement needs of CSPs, we currently offer 40 ONT and residential gateway models 
available in a variety of form factors tailored to multiple deployment scenarios, including single homes, MDUs, businesses and cellular 
towers as illustrated below: 

16

Calix T-Series Optical Network Terminals and Residential Gateways 

Our T-Series ONTs consist of a broad range of customer premises solutions, including standards-based ONTs and residential gateways, 
for residential and business use with our BLM1500 terminals. Our T-Series ONTs and residential gateways are designed to support advanced 
broadband services, such as IPTV, high speed data, and voice services. We launched our T-Series ONTs and residential gateways in 
November 2012, following our acquisition of Ericsson's EDA 1500 GPON technology and its supplementary ONT portfolio.

To meet the deployment and service requirement needs of CSPs, we currently offer a variety of ONT and residential gateway models 

available in an array of indoor form factors as illustrated below: 

Calix Management System and Entriview  

Our CMS and Entriview element management systems are server-based network management software, which enables CSPs to 

remotely manage their access networks and scale bandwidth capacity to support advanced broadband services and video. Our CMS and 
Entriview systems are capable of overseeing and managing multiple standalone networks and perform all provisioning, maintenance and 
troubleshooting operations for these networks across our B-Series, C-Series, and E-Series platforms and nodes (CMS) and BLM1500 
terminals (Entriview). Additionally, our CMS and Entriview systems are designed to scale from small networks to large, geographically 
dispersed networks consisting of hundreds or even thousands of our access systems. Our CMS provides an enhanced graphic user interface 
and delivers a detailed view and interactive control of various management functions, such as access control lists, alarm reporting and 
security. For very large CSPs, our CMS and Entriview systems can be used in conjunction with operational support systems to manage large, 
global networks with tens of millions of subscribers. Our CMS and Entriview systems are scalable to support large networks and enables 
integration into the other management systems of our customers. For smaller CSPs, our CMS operates as a standalone element management 
system, managing service provisioning and network troubleshooting for hundreds of independent C-Series and E-Series networks consisting 
of thousands of shelves and P-Series ONTs.

We offer CSPs a graphical user interface-based management software for provisioning and troubleshooting a service, and the capacity 

for bulk provisioning and reporting for thousands of elements simultaneously. Our CMS also has open application programming interfaces 
that allow third-party software developers to extend our functionality to include home provisioning, remote troubleshooting and applications 
monitoring and management. The OccamView element management system is currently used to provide management services for some B6 
and 2000 family of ONT customers, however, these ONT products are being fully integrated into CMS in a coming release. The following 
pictures are sample screenshots illustrating CMS and Entriview functionality and variety of third-party applications: 

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18

 
Compass by Calix 

Compass is a suite of software applications that enables CSPs to accelerate their business transformation. Each Compass application is 

designed to directly affect key business and market functions within CSPs, and can help them to expand revenue, increase customer 
satisfaction, optimize network resources, and reduce the cost of delivering services. Compass applications are offered using a software-as-a-
service model based on a low monthly service fee and no upfront hardware or licensing fees. Every application is hosted in a cloud-based 
data center, alleviating CSPs’ need to deploy, operate, or maintain physical hardware for Compass applications. 

Flow Analyze offers a tool that provides an in-depth view of the traffic in CSP networks on a real-time basis. This view of traffic is 

non-intrusive, and can be focused on a per-service, per-subscriber, per-location, and per-interface basis-both in real time and as a historical 
report. As a result, service providers can see what actually happened when a problem occurred in their network at any time. By monitoring 
subscriber usage data, as well as tracking universal subscriber identification mapping, Flow Analyze provides a low cost solution for 
generating monthly-usage billing reports and diagnosing subscriber complaints. 

Consumer Connect enables service providers to remotely activate new broadband devices and manage home networks, creating new 

revenue sources, improved customer satisfaction, and reduced service delivery costs. Consumer Connect provides TR-069 ACS device 
management via a cloud-based software-as-a-service solution hosted by Calix, and offers such features as auto-discovery of intelligent 
devices within the home, auto-support of new TR-069 devices, bulk gateway maintenance, and DHCP server functionality as well as the 
ability to push service profiles to gateways. Consumer Connect also shares a common customer ID with Flow Analyze, allowing the 
applications to work closely together. Consumer connect can also provide remote customer LAN diagnostics as well as LAN visibility to help 
track consumer electronics trends.

The following picture is a sample screenshot and illustration of Flow Analyze and Consumer Connect functionality: 

19

Research and Development 

Continued investment in research and development is critical to our business. Our research and development team is composed of 
engineers with expertise in hardware, software and optics. Our team of engineers is primarily based in our Petaluma, California headquarters, 
the Minneapolis, Minnesota facility, the Santa Barbara and San Jose, California facilities, and the Nanjing, China facility, with additional 
engineers located in Acton, Massachusetts. We also outsource a portion of our software development to a team of software engineers based in 
Shenyang, China. Our research and development team is responsible for designing, developing and enhancing our hardware and software 
platforms, performing product and quality assurance testing and ensuring the compatibility of our products with third-party hardware and 
software products. We have made significant investments in our Unified Access portfolio. We intend to continue to dedicate significant 
resources to research and development and to develop new product capabilities to support the performance, scalability and management of 
our Unified Access portfolio. For the years ended 2012, 2011, and 2010, our research and development expenses totaled $66.7 million, $67.7 
million, and $55.4 million, respectively. 

Manufacturing 

We work closely with third parties to manufacture and deliver our products. Our manufacturing organization consists primarily of 

supply chain managers, new product introduction personnel and test engineers. We outsource our manufacturing and order fulfillment and 
tightly integrate our supply chain management and new product introduction activities. We primarily utilize Flextronics International Ltd. 
("Flextronics"), as our contract manufacturer. Our relationship with Flextronics allows us to conserve working capital, reduce product costs 
and minimize delivery lead times while maintaining high product quality. Generally, new product introduction occurs in Flextronics’ facilities 
in Milpitas, California. Once product manufacturing quality and yields reach a satisfactory level, volume production and testing of circuit 
board assemblies, chassis and fan trays occur in Shanghai, China. Final system and cabinet assembly and testing are performed in Flextronics’ 
facilities in Guadalajara, Mexico. Order fulfillment is performed by Pegasus Logistics Group in Texas. We also evaluate and utilize other 
vendors for various portions of our supply chain from time to time, including order fulfillment of our circuit boards. This model allows us to 
operate with low inventory levels while maintaining the ability to scale quickly to handle increased order volume. 

Product reliability is essential for our customers, who place a premium on continuity of service for their subscribers. We perform 
rigorous in-house quality control testing to help ensure the reliability of our systems. Our internal manufacturing organization designs, 
develops and implements complex test processes to help ensure the quality and reliability of our products. 

The manufacturing of our products by contract manufacturers is a complex process and involves certain risks, including the potential 

absence of adequate capacity, the unavailability of or interruptions in access to certain process technologies, and the reduced control over 
delivery schedules, manufacturing yields, quality and costs. As such, we may experience production problems or manufacturing delays in the 
future. Additionally, shortages in components that we use in our systems are possible and our ability to predict the availability of such 
components, some sourced from a single or limited source of supply, may be limited. Our systems include some components that are 
proprietary in nature and only available from a single source, as well as some components that are generally available from a number of 
suppliers. The lead times associated with certain components are lengthy and preclude rapid changes in product specifications or delivery 
schedules. In some cases, significant time would be required to establish relationships with alternate suppliers or providers of proprietary 
components. We generally do not have long-term contracts with component providers that guarantee the supply of components or their 
manufacturing services. If we experience any difficulties in managing relationships with our contract manufacturers, or any interruption in 
our own operations or our contract manufacturers operations or if a supplier is unable to meet our needs, we may encounter manufacturing 
delays that could impede our ability to meet our customers’ requirements and harm our business, operating results and financial condition. 
Our ability to deliver products in a timely manner to our customers would be adversely impacted materially if we needed to qualify 
replacements for any of the components used in our systems. 

To date, we have not experienced significant delays or material unanticipated costs resulting from the use of our contract 

manufacturers. Additionally, we believe that our current contract manufacturers and our facilities can accommodate an increase in capacity 
for production sufficient for the foreseeable future. 

20

Seasonality 

Fluctuations in our revenue occur due to many factors, including the varying budget cycles for our customers and seasonal buying 
patterns of our customers. More specifically, our customers tend to spend less in the first fiscal quarter as they are finalizing their annual 
budgets. Customer spending then increases in subsequent quarters for the remainder of the year and typically ends with a strong fourth 
quarter. 

Intellectual Property 

Our success depends upon our ability to protect our core technology and intellectual property. To accomplish this, we rely on a 

combination of intellectual property rights, including patents, trade secrets, copyrights and trademarks, as well as customary contractual 
protections. In addition, we generally control access to and the use of our proprietary technology and other confidential information. This 
protection is accomplished through a combination of internal and external controls, including contractual protections with employees, 
contractors, customers and partners, and through a combination of U.S. and international intellectual property laws. 

As of December 31, 2012, we held 72 U.S. patents and had 36 pending U.S. patent applications. Two of the U.S. patents are also 
covered by granted international patents, one in five countries and the other in three countries. As of December 31, 2012, we had no pending 
international patent applications. Patents generally have a term of twenty years from filing. As our patent portfolio has been built over time, 
the remaining terms on the individual patents vary. Information pertaining to our patents such as filing dates and terms is available free-of-
charge at the United States Patent and Trademark Office website at www.uspto.gov.

We rely on intellectual property laws, as well as nondisclosure agreements, licensing arrangements and confidentially provisions, to 

establish and protect our proprietary rights. U.S. patent, copyright and trade secret laws afford us only limited protection, and the laws of 
some foreign countries do not protect proprietary rights to the same extent. Our pending patent applications may not result in issued patents, 
and the issued patents may not be enforceable. Any infringement of proprietary rights could result in significant litigation costs. Further, any 
failure by us to adequately protect our proprietary rights could result in competitors offering similar products, resulting in the loss of our 
competitive advantage and decreased sales. 

We believe that the frequency of assertions of patent infringement is increasing as patent holders, including entities that are not in our 

industry and others who purchase patents as an investment or to monetize such rights by obtaining royalties, use such actions as a competitive 
tactic as well as a source of additional revenue. Any claim of infringement from a third party, even those without merit, could cause us to 
incur substantial costs defending against such claims and could distract our management from running our business. Furthermore, a party 
making such a claim, if successful, could secure a judgment that requires us to pay substantial damages. A judgment could also include an 
injunction or other court order that could prevent us from selling our systems. In addition, we might be required to seek a license for the use 
of such intellectual property, which may not be available on commercially reasonable terms or at all. Alternatively, we may be required to 
develop non-infringing technology, which would require significant effort and expense and may ultimately not be successful. 

Competition 

The communications access equipment market is highly competitive. Competition in this market is based on any one or a combination 

of the following factors: 

  •  price; 

  •  functionality; 

  •  existing business and customer relationships; 

  •  the ability of products and services to meet customers’ immediate and future network requirements; 

  •  product quality; 

  •  installation capability; 

  •  service and support; 

  •  scalability; and 

  •  manufacturing capability. 

We compete with a number of companies within markets that we serve and we anticipate that competition will intensify. ADTRAN, 

Inc., enjoys strong supplier relationships with the largest U.S. ILECs, commands the leading market share position in DSL access 
multiplexers, and has a broad international business. Other established suppliers with which we compete include Alcatel- Lucent S.A., Ciena 
Corporation, Huawei Technologies Co., Ltd., Tellabs, Inc., and ZTE Corporation. There are also a number of smaller companies with which 
we compete in various geographic or vertical markets, including Zhone Technologies, Inc. While most of these smaller competitors lack 
broad national scale and product portfolios, they can offer strong competition on a deal-by-deal basis. Competition in the communications 
access equipment market is dominated by a small number of large, multi-national corporations. Many of our competitors have substantially 
greater name recognition and technical, financial and marketing resources, and greater manufacturing capacity, as well as better established 
relationships with CSPs, than we do. Many of our competitors have greater resources to develop products or pursue acquisitions, and more 
experience in developing or acquiring new products and technologies and in creating market awareness for these products and technologies. 
In addition, a number of our competitors have the financial resources to offer competitive products at below market pricing levels that could 
prevent us from competing effectively. Further, a number of our competitors have built long-standing relationships with some of our 
prospective customers and provide financing to customers and could, therefore, have an advantage in selling products to those customers. 

21

Government Funding Initiatives 

Many of our customers fund deployment of and improvements to telecommunications network infrastructure using government funds. 
In the United States, CSPs are required under the Federal Communications Commission's rules to contribute a percentage of their revenues to 
the federal Universal Service Fund. In early October 2011, the chairman of the FCC outlined a plan to transform the Universal Service Fund, 
an $8 billion fund that is paid for by the nation's telephone customers and used to subsidize basic telephone service in rural areas, into one 
that will help expand broadband Internet service to 18 million Americans who lack high-speed access. These funds, now governed by a new 
set of rules now call the Connect America Fund ("CAF"), are distributed as subsidies to CSPs serving rural subscribers that are expensive to 
reach as well as to low-income consumers, schools and libraries, and rural health care facilities. RUS administers funds through a separate 
U.S. government initiative to promote the development of telecommunications infrastructure in rural areas through loans, loan guarantees and 
grants. Some of our U.S. customers have been awarded RUS loans, and we have provided the network equipment for such projects. 

Employees 

As of December 31, 2012, we employed a total of 714 full-time employees. Most of our employees are located in North America. None 

of our employees is represented by a labor union with respect to his or her employment with us. We have not experienced any work 
stoppages, and we consider our relations with our employees to be good. 

Corporate Information 

Calix, a Delaware corporation, was founded in August 1999. Our principal executive offices are located at 1035 N. McDowell 
Boulevard, Petaluma, California 94954, and our telephone number is (707) 766-3000. Our website address is www.calix.com. We do not 
incorporate the information on or accessible through our website into this Form 10-K, and you should not consider any information on, or that 
can be accessed through, our website as part of this Form 10-K. Calix®, the Calix logo design, B6™, C7®, E5™, E7™ and other trademarks 
or service marks of Calix appearing in this report on Form 10-K are the property of Calix. Trade names, trademarks and service marks of 
other companies appearing in this report on Form 10-K are the property of the respective holders. Calix is subject to the information and 
periodic reporting requirements of the Securities Exchange Act of 1934 ("Exchange Act") and, in accordance therewith, files periodic reports, 
proxy statements and other information with the Securities and Exchange Commission ("SEC"). Such periodic reports, proxy statements and 
other information is available for inspection and copying at the SEC’s Public Reference Room at 100 F Street, NE., Washington, DC 20549 
or may be obtained by calling the SEC at 1-800-SEC-0330. In addition, the SEC maintains a Web site at http://www.sec.gov that contains 
reports, proxy statements and other information regarding issuers that file electronically with the SEC. Calix posts on the Investor Relations 
page of its Web site, www.calix.com, a link to its filings with the SEC, which are posted as soon as reasonably practical after they are filed 
electronically with the SEC. 

ITEM 1A. 

Risk Factors

We have identified the following additional risks and uncertainties that may affect our business, financial condition and/or results of 
operations. Investors should carefully consider the risks described below, together with the other information set forth in this Annual Report 
on Form 10-K, before making any investment decision. The risks described below are not the only ones we face. Additional risks not currently 
known to us or that we currently believe are immaterial may also significantly impair our business operations. Our business could be harmed 
by any of these risks. The trading price of our common stock could decline due to any of these risks, and investors may lose all or part of their 
investment.

Risks Related to Our Business and Industry

Our markets are rapidly changing, which make it difficult to predict our future revenue and plan our expenses appropriately.

We compete in markets characterized by rapid technological change, changing needs of communications service providers, evolving 
industry standards and frequent introductions of new products and services.  In addition, we likely will be required to reposition our product 
and service offerings and introduce new products and services as we encounter rapidly changing CSP requirements and increasing 
competitive pressures. We may not be successful in doing so in a timely and responsive manner, or at all. Also, softness in demand across any 
of our customer markets, including due to macro-economic conditions beyond our control or uncertainties associated with the implementation 
of regulatory reforms, could lead to unexpected slowdown in capital expenditures by service providers, such as what occurred in the second 
quarter of 2012. As a result, it is difficult to forecast our future revenues and plan our operating expenses appropriately, which also makes it 
difficult to predict our future operating results.

We have a history of losses, and we may not be able to generate positive operating income and cash flows in the future.

We have experienced net losses in each year of our existence. For the years ended December 31, 2012, December 31, 2011, and 
December 31, 2010, we incurred net losses of $28.3 million, $52.6 million, and $18.6 million, respectively. As of December 31, 2012, we had 
an accumulated deficit of $492.5 million.

We expect to continue to incur significant expenses for research and development, sales and marketing, customer support and general 
and administrative functions as we expand our operations. Given our growth rate and the intense competitive pressures we face, we may be 
unable to control our operating costs.

We cannot guarantee that we will achieve profitability in the future. We will have to generate and sustain significant and consistent 
increased revenue, while continuing to control our expenses, in order to achieve and then maintain profitability. We may also incur significant 
losses in the future for a number of reasons, including the risks discussed in this “Risk Factors” section and factors that we cannot anticipate. 
22

If we are unable to generate positive operating income and cash flow from operations, our liquidity, results of operations and financial 
condition will be adversely affected.

Fluctuations in our quarterly and annual operating results may make it difficult to predict our future performance, which could cause 
our operating results to fall below investor or analyst expectations, which could adversely affect the trading price of our stock.

A number of factors, many of which are outside of our control, may cause or contribute to significant fluctuations in our quarterly and 

annual operating results. These fluctuations may make financial planning and forecasting difficult. Comparing our operating results on a 
period-to-period basis may not be meaningful, and you should not rely on our past results as an indication of our future performance. If our 
revenue or operating results fall below the expectations of investors or securities analysts, or below any guidance we may provide to the 
market, the price of our common stock would likely decline. Moreover, we may experience delays in recognizing revenue under applicable 
revenue recognition rules, particularly from government-funded contracts, such as those funded by RUS. The extent of these delays and their 
impact on our revenues can fluctuate over a given time period depending on the number and size of purchase orders under these contracts 
during such time period. In addition, unanticipated decreases in our available liquidity due to fluctuating operating results could limit our 
growth and delay implementation of our expansion plans.

In addition to the other risk factors listed in this “Risk Factors” section, factors that may contribute to the variability of our operating 

results include:

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

our ability to predict our revenue and plan our expenses appropriately;

the capital spending patterns of CSPs and any decrease or delay in capital spending by CSPs due to macro-economic 
conditions, regulatory implementation or uncertainties, or other reasons;

the impact of government-sponsored programs on our customers;

intense competition;

our ability to develop new products or enhancements that support technological advances and meet changing CSP 
requirements;

our ability to achieve market acceptance of our products and CSPs’ willingness to deploy our new products;

the concentration of our customer base;

the length and unpredictability of our sales cycles;

our focus on CSPs with limited revenue potential;

our lack of long-term, committed-volume purchase contracts with our customers;

our ability to increase our sales to larger North American as well as international CSPs;

our exposure to the credit risks of our customers;

fluctuations in our gross margin;

the interoperability of our products with CSP networks;

our dependence on sole and limited source suppliers;

our ability to manage our relationships with our contract manufacturers;

our ability to forecast our manufacturing requirements and manage our inventory;

our products’ compliance with industry standards;

our ability to expand our international operations;

our ability to protect our intellectual property and the cost of doing so;

the quality of our products, including any undetected hardware errors or bugs in our software;

our ability to estimate future warranty obligations due to product failure rates;

our ability to obtain necessary third-party technology licenses;

any obligation to issue performance bonds to satisfy requirements under RUS contracts;

the attraction and retention of qualified employees and key personnel; and

our ability to maintain proper and effective internal controls.

Our business is dependent on the capital spending patterns of CSPs, and any decrease or delay in capital spending by CSPs, in response 
to economic conditions, uncertainties associated with the implementation of regulatory reforms, or otherwise, would reduce our revenues 
and harm our business.

Demand for our products depends on the magnitude and timing of capital spending by CSPs as they construct, expand, upgrade and 

maintain their access networks. The recent economic downturn has contributed to a slowdown in telecommunications industry spending, 
including in the specific geographies and markets in which we operate. In response to reduced consumer spending, challenging capital 
markets or declining liquidity trends, capital spending for network infrastructure projects of CSPs could be delayed or canceled. In addition, 
capital spending is cyclical in our industry and sporadic among individual CSPs, and can change on short notice. As a result, we may not have 
visibility into changes in spending behavior until nearly the end of a given quarter. 

CSP spending on network construction, maintenance, expansion and upgrades is also affected by reductions in their budgets, delays in 

their purchasing cycles, access to external capital, e.g., government grants and loan programs or the capital markets, and seasonality and 
capital allocation decisions.

23

Many factors affecting our results of operations are beyond our control, particularly in the case of large CSP orders and network 
infrastructure deployments involving multiple vendors and technologies where the achievement of certain thresholds for acceptance is subject 
to the readiness and performance of the customer or other providers, and changes in customer requirements or installation plans. Further, 
CSPs may not pursue infrastructure upgrades that require our access systems and software. Infrastructure improvements may be delayed or 
prevented by a variety of factors including cost, regulatory obstacles (including uncertainties associated with the implementation of 
regulatory reforms), mergers, lack of consumer demand for advanced communications services and alternative approaches to service delivery. 
Reductions in capital expenditures by CSPs may slow our rate of revenue growth. As a consequence, our results for a particular period may 
be difficult to predict, and our prior results are not necessarily indicative of results likely in future periods.

Government-sponsored programs could impact the timing and buying patterns of CSPs, which may cause fluctuations in our operating 
results.

Many of our customers are Independent Operating Companies ("IOCs"), which have revenues that are particularly dependent upon 

interstate and intrastate access charges, and federal and state subsidies. The Federal Communications Commission ("FCC"), and some states 
are considering changes to such payments and subsidies, and these changes could reduce IOC revenues. Furthermore, many IOCs use or 
expect to use, government-supported loan programs or grants, such as RUS loans and grants to finance capital spending. Changes to these 
programs could reduce the ability of IOCs to access capital and thus reduce our revenue opportunities.

Many of our customers were awarded grants or loans under government stimulus programs such as the Broadband Stimulus programs 

under the American Recovery and Reinvestment Act of 2009 and have purchased and will continue to purchase products from us or other 
suppliers while such programs and funding remain in place. However, customers may substantially curtail future purchases of products as 
ARRA funding winds down or because all purchases have been completed. The timetable for completion of funded projects varies between 
the two agencies administering the awards. Projects funded under the Broadband Technology Opportunities Program, which is administered 
by the National Telecommunications and Information Administration, must be completed by September 30, 2013. Projects funded under the 
Broadband Initiatives Program, which is administered by the Rural Utilities Service, must be completed by June 30, 2015.

We have experienced continued delays in purchasing commitments from our customers who have been awarded Broadband Stimulus 
funds, which have negatively impacted our operating results and additional delays could continue to adversely impact our operating results. 
In addition, the revenue recognition guidelines related to the sales of our access systems to CSPs who have received Broadband Stimulus 
funds may create uncertainties around the timing of our revenue, which could harm our financial results. In addition, any changes in 
government regulations and subsidies could cause our customers to change their purchasing decisions, which could have an adverse effect on 
our operating results and financial condition.

We face intense competition that could reduce our revenue and adversely affect our financial results.

The market for our products is highly competitive, and we expect competition from both established and new companies to increase. 

Our competitors include companies such as ADTRAN, Inc., Alcatel- Lucent S.A., Ciena Corporation, Huawei Technologies Co., Ltd., 
Tellabs, Inc. and ZTE Corporation.

Our ability to compete successfully depends on a number of factors, including:

• 

• 

• 

• 

• 

• 

the successful development of new products;

our ability to anticipate CSP and market requirements and changes in technology and industry standards;

our ability to differentiate our products from our competitors' offerings based on performance, cost-effectiveness or other 
factors;

our ongoing ability to successfully integrate acquired product lines and customer bases into our business; 

our ability to gain customer acceptance of our products; and

our ability to market and sell our products.

The broadband access equipment market has undergone consolidation in recent years, as participants have merged, made acquisitions 

or entered into partnerships or other strategic relationships with one another to offer more comprehensive solutions than they individually had 
offered. Examples include Ciena Corporation's acquisition of Nortel's Metro Ethernet Networks business in March 2010, Enablence 
Technologies, Inc.'s acquisition of Teledata Networks, Ltd. in June 2010, our acquisitions of Occam in February 2011 and of Ericsson's fiber 
access assets in November 2012, and Adtran's acquisition of Nokia Siemens' broadband access line business in May 2012. We expect this 
trend to continue as companies attempt to strengthen or maintain their market positions in an evolving industry. 

Many of our current or potential competitors have longer operating histories, greater name recognition, larger customer bases and 

significantly greater financial, technical, sales, marketing and other resources than we do and are better positioned to acquire and offer 
complementary products and services technologies. Many of our competitors have broader product lines and can offer bundled solutions, 
which may appeal to certain customers. Our competitors may also invest additional resources in developing more compelling product 
offerings. Potential customers may also prefer to purchase from their existing suppliers rather than a new supplier, regardless of product 
performance or features, because the products that we and our competitors offer require a substantial investment of time and funds to install. 

Some of our competitors may offer substantial discounts or rebates to win new customers. If we are forced to reduce prices in order to 
secure customers, we may be unable to sustain gross margins at desired levels or achieve profitability. Competitive pressures could result in 
increased pricing pressure, reduced profit margins, increased sales and marketing expenses and failure to increase, or the loss of, market 
share, any of which could reduce our revenue and adversely affect our financial results.

24

Product development is costly and if we fail to develop new products or enhancements that meet changing CSP requirements, we could 
experience lower sales.

Our market is characterized by rapid technological advances, frequent new product introductions, evolving industry standards and 

unanticipated changes in subscriber requirements. Our future success will depend significantly on our ability to anticipate and adapt to such 
changes, and to offer, on a timely and cost-effective basis, products and features that meet changing CSP demands and industry standards.

We intend to continue making significant investments in developing new products and enhancing the functionality of our existing 

products. Developing our products is expensive, complex and involves uncertainties. We may not have sufficient resources to successfully 
manage lengthy product development cycles. For the years ended December 31, 2012, 2011 and 2010, our research and development 
expenses were $66.7 million, or 20% of our revenue, $67.7 million, or 20% of our revenue, and $55.4 million, or 19% of our revenue, 
respectively. We believe that we must continue to dedicate a significant amount of resources to our research and development efforts to 
maintain our competitive position. These investments may take several years to generate positive returns, if ever. In addition, we may 
experience design, manufacturing, marketing and other difficulties that could delay or prevent the development, introduction or marketing of 
new products and enhancements. If we fail to meet our development targets, demand for our products will decline.

In addition, the introduction of new or enhanced products also requires that we manage the transition from older products to these new 

or enhanced products in order to minimize disruption in customer ordering patterns, fulfill ongoing customer commitments and ensure that 
adequate supplies of new products are available for delivery to meet anticipated customer demand. If we fail to maintain compatibility with 
other software or equipment found in our customers’ existing and planned networks, we may face substantially reduced demand for our 
products, which would reduce our revenue opportunities and market share. Moreover, as customers complete infrastructure deployments, they 
may require greater levels of service and support than we have provided in the past. We may not be able to provide products, services and 
support to compete effectively for these market opportunities. If we are unable to anticipate and develop new products or enhancements to 
our existing products on a timely and cost-effective basis, we could experience lower sales, which would harm our business.

Our new products are early in their life cycles and are subject to uncertain market demand. If our customers are unwilling to install our 
products or deploy new services or we are unable to achieve market acceptance of our new products, our business and financial results 
will be harmed.

Our new products are early in their life cycles and are subject to uncertain market demand. They also may face obstacles in 

manufacturing, deployment and competitive response. Potential customers may choose not to invest the additional capital required for initial 
system deployment. In addition, demand for our products is dependent on the success of our customers in deploying and selling services to 
their subscribers. Our products support a variety of advanced broadband services, such as high-speed Internet, Internet protocol television, 
mobile broadband, high-definition video and online gaming, and basic voice and data services. If subscriber demand for such services does 
not grow as expected or declines, or if our customers are unable or unwilling to deploy and market these services, demand for our products 
may decrease or fail to grow at rates we anticipate.

Our customer base is concentrated, and there are a limited number of potential customers for our products. The loss of any of our key 
customers, a decrease in purchases by our key customers or our inability to grow our customer base would adversely impact our revenues.

Historically, a large portion of our sales has been to a limited number of customers. For example, for the years ended December 31, 

2012, 2011 and 2010 , CenturyLink accounted for 21%,  20% and 29% , respectively, of our revenue. However, we cannot anticipate the level 
of CenturyLink's purchases in the future. The ongoing integration process at CenturyLink following its 2011 merger with Qwest 
Communications continues to create uncertainty as to whether we will remain a preferred network equipment vendor for the combined 
organization.

We anticipate that a large portion of our revenues will continue to depend on sales to a limited number of customers. In addition, some 

larger customers may demand discounts and rebates or desire to purchase their access systems and software from multiple providers. As a 
result of these factors, our future revenue opportunities may be limited and our margins could be reduced, and our profitability may be 
adversely impacted. The loss of, or reduction in, orders from any key customer would significantly reduce our revenues and harm our 
business.

Furthermore, in recent years, the CSP market has undergone substantial consolidation. Industry consolidation generally has negative 
implications for equipment suppliers, including a reduction in the number of potential customers, a decrease in aggregate capital spending, 
and greater pricing leverage on the part of CSPs over equipment suppliers. Continued consolidation of the CSP industry and among the 
Incumbent Local Exchange Carrier ("ILEC") and IOC customers, who represent a large part of our business, could make it more difficult for 
us to grow our customer base, increase sales of our products and maintain adequate gross margins.

Our sales cycles can be long and unpredictable, and our sales efforts require considerable time and expense. As a result, our sales are 
difficult to predict and may vary substantially from quarter to quarter, which may cause our operating results to fluctuate significantly.

The timing of our revenues is difficult to predict. Our sales efforts often involve educating CSPs about the use and benefits of our 

products. CSPs typically undertake a significant evaluation process, which frequently involves not only our products but also those of our 
competitors and results in a lengthy sales cycle. We spend substantial time, effort and money in our sales efforts without any assurance that 
our efforts will produce any sales. In addition, product purchases are frequently subject to budget constraints, multiple approvals and 
unplanned administrative, processing and other delays. If sales expected from a specific customer for a particular quarter are not realized in 
that quarter or at all, we may not achieve our revenue forecasts and our financial results would be adversely affected.

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Our focus on CSPs with relatively small networks limits our revenues from sales to any one customer and makes our future operating 
results difficult to predict.

We currently focus a large portion of our sales efforts on IOCs, cable multiple system operators and selected international CSPs. In 

general, our current and potential customers generally operate small networks with limited capital expenditure budgets. Accordingly, we 
believe the potential revenues from the sale of our products to any one of these customers is limited. As a result, we must identify and sell 
products to new customers each quarter to continue to increase our sales. In addition, the spending patterns of many of our customers are 
characterized by small and sporadic purchases. As a consequence, we have limited backlog and will likely continue to have limited visibility 
into future operating results.

We do not have long-term, committed-volume purchase contracts with our customers, and therefore have no guarantee of future revenues 
from any customer.

Our sales are made predominantly via purchase orders, and typically we have not entered into long-term, committed-volume purchase 

contracts with our customers, including our key customers, which account for a material portion of our revenues. As a result, any of our 
customers may cease to purchase our products at any time. In addition, our customers may attempt to renegotiate terms of sale, including 
price and quantity. If any of our key customers stop purchasing our access systems and software for any reason, our business and results of 
operations would be harmed.

Our efforts to increase our sales to larger North American as well as international CSPs, including MSOs, may be unsuccessful.

Our sales and marketing efforts have been focused on CSPs, including cable MSOs, in North America. A part of our long-term strategy 

is to increase sales to larger North American as well as international CSPs, including MSOs. We will be required to devote substantial 
technical, marketing and sales resources to the pursuit of these larger CSPs, who have lengthy equipment qualification and sales cycles, 
without any assurance of generating sales. In particular, sales to these larger CSPs may require us to upgrade our products to meet more 
stringent performance criteria, develop new customer-specific features or adapt our product to meet international standards. If we are unable 
to successfully increase our sales to larger CSPs, our operating results and long-term growth may be negatively impacted.

We are exposed to the credit risks of our customers, and if we have inadequately assessed their credit we may have more exposure to 
accounts receivable risk than we anticipate. Failure to collect our accounts receivable in amounts that we anticipate could adversely affect 
our operating results and financial condition.

In the course of our sales to customers, we may encounter difficulty collecting accounts receivable and could be exposed to risks 

associated with uncollectible accounts receivable. We maintain an allowance for doubtful accounts for estimated losses resulting from the 
inability or unwillingness of our customers to make required payments. However, these allowances are based on our judgment and a variety 
of factors about which our judgment may be wrong or that may change. 

We perform credit evaluations of our customers' financial condition.  However, our evaluation of the creditworthiness of customers 

may not be accurate if they do not provide us with accurate financial information, or if their situation changes after we evaluate their credit. 
While we attempt to monitor these situations carefully and attempt to adjust our allowances for doubtful accounts as appropriate, and take 
appropriate measures to collect accounts receivable balances, we have written down accounts receivable and written off doubtful accounts in 
prior periods and may be unable to avoid additional write-downs or write-offs of doubtful accounts in the future. Such write-downs or write-
offs could negatively affect our operating results for the period in which they occur, and could harm our operating results.

Our gross margin may fluctuate over time and our current level of product gross margins may not be sustainable.

Our current level of product gross margins may not be sustainable and may be adversely affected by numerous factors, including:

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changes in customer, geographic or product mix, including the mix of configurations within each product group;

increased price competition, including the impact of customer discounts and rebates;

our inability to reduce and control product costs;

changes in component pricing, changes in contract manufacturer rates, or charges incurred due to inventory holding periods if 
parts ordering does not correctly anticipate product demand;

introduction of new products;

changes in shipment volume;

changes in distribution channels;

increased warranty costs;

excess and obsolete inventory and inventory holding charges;

expediting costs incurred to meet customer delivery requirements; and

liquidated damages relating to customer contractual terms.

Our products must interoperate with many software applications and hardware products found in our customers’ networks. If we are 
unable to ensure that our products interoperate properly, our business would be harmed.

Our products must interoperate with our customers’ existing and planned networks, which often have varied and complex 

specifications, utilize multiple protocol standards, software applications and products from multiple vendors and contain multiple generations 
of products that have been added over time. As a result, we must continually ensure that our products interoperate properly with these existing 
and planned networks. To meet these requirements, we must undertake development efforts that require substantial capital investment and 

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employee resources. We may not accomplish these development efforts quickly or cost-effectively, if at all. If we fail to maintain 
compatibility with other software or equipment found in our customers’ existing and planned networks, we may face substantially reduced 
demand for our products, which would reduce our revenue opportunities and market share.

We have entered into interoperability arrangements with a number of equipment and software vendors for the use or integration of their 

technology with our products. These arrangements give us access to, and enable interoperability with, various products that we do not 
otherwise offer. If these relationships fail, we may have to devote substantially more resources to the development of alternative products and 
processes, and our efforts may not be as effective as the combined solutions under our current arrangements. In some cases, these other 
vendors are either companies that we compete with directly, or companies that have extensive relationships with our existing and potential 
customers and may have influence over the purchasing decisions of those customers. Some of our competitors have stronger relationships 
with some of our existing and potential other vendors and, as a result, our ability to have successful interoperability arrangements with these 
companies may be harmed. Our failure to establish or maintain key relationships with third-party equipment and software vendors may harm 
our ability to successfully sell and market our products.

As we do not have manufacturing capabilities, we depend upon a small number of outside contract manufacturers and we do not have 
supply contracts with these manufacturers. Our operations could be disrupted if we encounter problems with these contract 
manufacturers.

We do not have internal manufacturing capabilities, and rely upon a small number of contract manufacturers to build our products. In 

particular, we rely on Flextronics for the manufacture of most of our products. Our reliance on a small number of contract manufacturers 
makes us vulnerable to possible capacity constraints and reduced control over component availability, delivery schedules, manufacturing 
yields and costs. 

We do not have supply contracts with Flextronics or our other manufacturers. Consequently, these manufacturers are not obligated to 

supply products to us for any specific period, in any specific quantity or at any certain price. In addition, we have limited control over our 
contract manufacturers' quality systems and controls, and therefore may not be able to ensure levels of quality manufacture suitable for our 
customers.

The revenues that Flextronics generates from our orders represent a relatively small percentage of Flextronics' overall revenues. As a 
result, fulfilling our orders may not be considered a priority in the event Flextronics is constrained in its ability to fulfill all of its customer 
obligations in a timely manner. In addition, a substantial part of our manufacturing is done in Flextronics facilities that are located outside of 
the United States. We believe that the location of these facilities outside of the United States increases supply risk, including the risk of 
supply interruptions or reductions in manufacturing quality or controls. 

If Flextronics or any of our other contract manufacturers were unable or unwilling to continue manufacturing our products in required 
volumes and at high quality levels, we would have to identify, qualify and select acceptable alternative contract manufacturers. An alternative 
contract manufacturer may not be available to us when needed or may not be in a position to satisfy our production requirements at 
commercially reasonable prices and quality. Any significant interruption in manufacturing would require us to reduce our supply of products 
to our customers, which in turn would reduce our revenues and harm our relationships with our customers.

We depend on sole source and limited source suppliers for key components and products. If we are unable to source these components on 
a timely basis, we will not be able to deliver our products to our customers.

We depend on sole source and limited source suppliers for key components of our products. For example, certain of our application-
specific integrated circuits processors and resistor networks are purchased from sole source suppliers. We may from time to time enter into 
original equipment manufacturer ("OEM") or original design manufacturer ("ODM") agreements to manufacture and/or design certain 
products in order to enable us to offer products into key markets on an accelerated basis. For example, a third party assisted in the design of 
and currently manufactures our E5-100 platform family. 

Any of the sole source and limited source suppliers, OEMs and ODMs upon whom we rely could stop producing our components or 

products, cease operations or be acquired by, or enter into exclusive arrangements with, our competitors. We generally purchase our products 
through purchase orders and our purchase volumes are currently too low for us to be considered a priority customer by most of our suppliers. 
As a result, most of these suppliers could stop selling to us at commercially reasonable prices, or at all. Any such interruption or delay may 
force us to seek similar components or products from alternative sources, which may not be available. Switching suppliers, OEMs or ODMs 
may require that we redesign our products to accommodate new components, and may potentially require us to re-qualify our products with 
our customers, which would be costly and time-consuming. Any interruption in the supply of sole source or limited source components for 
our products would adversely affect our ability to meet scheduled product deliveries to our customers, could result in lost revenue or higher 
expenses and would harm our business.

If we fail to forecast our manufacturing requirements accurately or fail to properly manage our inventory with our contract 
manufacturers, we could incur additional costs, experience manufacturing delays and lose revenue.

We bear inventory risk under our contract manufacturing arrangements. Lead times for the materials and components that we order 
through our contract manufacturers vary significantly and depend on numerous factors, including the specific supplier, contract terms and 
market demand for a component at a given time. Lead times for certain key materials and components incorporated into our products are 
currently lengthy, requiring us or our contract manufacturers to order materials and components several months in advance of manufacture. 

If we overestimate our production requirements, we or our contract manufacturers may purchase excess components and build excess 
inventory. If our contract manufacturers, at our request, purchase excess components that are unique to our products or build excess products, 
we could be required to pay for these excess parts or products and their storage costs. Historically, we have reimbursed our primary contract 
manufacturers for a portion of inventory purchases when our inventory has been rendered obsolete, for example due to manufacturing and 

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engineering change orders resulting from design changes manufacturing discontinuation of parts by our suppliers, or in cases where inventory 
levels greatly exceed projected demand. If we incur payments to our contract manufacturers associated with excess or obsolete inventory, this 
would have an adverse effect on our gross margins, financial condition and results of operations. 

We have experienced unanticipated increases in demand from customers, which resulted in delayed shipments and variable shipping 
patterns. If we underestimate our product requirements, our contract manufacturers may have inadequate component inventory, which could 
interrupt manufacturing of our products and result in delays or cancellation of sales.

If we fail to comply with evolving industry standards, sales of our existing and future products would be adversely affected.

The markets for our products are characterized by a significant number of standards, both domestic and international, which are 
evolving as new technologies are developed and deployed. Our products must comply with these standards in order to be widely marketable. 
In some cases, we are compelled to obtain certifications or authorizations before our products can be introduced, marketed or sold in new 
markets or to customers that we have not historically served. For example, our ability to obtain OSMINE certification for our products will 
affect our ongoing ability to continue to sell our products to CenturyLink and other Tier 1 CSPs. 

In addition, our ability to expand our international operations and create international market demand for our products may be limited 
by regulations or standards adopted by other countries that may require us to redesign our existing products or develop new products suitable 
for sale in those countries. Although we believe our products are currently in compliance with domestic and international standards and 
regulations in countries in which we currently sell, we may not be able to design our products to comply with evolving standards and 
regulations in the future. Accordingly, this ongoing evolution of standards may directly affect our ability to market or sell our products. 
Further, the cost of complying with the evolving standards and regulations, or the failure to obtain timely domestic or foreign regulatory 
approvals or certification such that we may not be able to sell our products where these standards or regulations apply, would result in lower 
revenues and lost market share.

We may be unable to successfully expand our international operations. In addition, we may be subject to a variety of international risks 
that could harm our business.

We currently generate most of our sales from customers in North America and have limited experience marketing, selling and 
supporting our products and services outside North America or managing the administrative aspects of a worldwide operation. While we are 
in the process of expanding our international operations, we may not be able to create or maintain international market demand for our 
products. In addition, as we expand our operations internationally, our support organization will face additional challenges including those 
associated with delivering support, training and documentation in languages other than English. If we invest substantial time and resources to 
expand our international operations and are unable to do so successfully and in a timely manner, our business, financial condition and results 
of operations will suffer.

In the course of expanding our international operations and operating overseas, we will be subject to a variety of risks, including:

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differing regulatory requirements, including tax laws, trade laws, labor regulations, tariffs, export quotas, custom duties or 
other trade restrictions;

liability or damage to our reputation resulting from corruption or unethical business practices in some countries;

fluctuation in currency exchange rates;

longer collection periods and difficulties in collecting accounts receivable; 

greater difficulty supporting and localizing our products;

different or unique competitive pressures as a result of, among other things, the presence of local equipment suppliers;

challenges inherent in efficiently managing an increased number of employees over large geographic distances, including the 
need to implement appropriate systems, policies, compensation and benefits and compliance programs;

limited or unfavorable intellectual property protection;

risk of change in international political or economic conditions, terrorist attacks or acts of war; and

restrictions on the repatriation of earnings.

We engage resellers, including Ericsson, to promote, sell, install and support our products to some customers in North America, and 
internationally. Their failure to do so or our inability to recruit or retain appropriate resellers may reduce our sales and thus harm our 
business.

We engage some value added resellers ("VARs"), who provide sales and support services for our products. In particular, we expect the 
non-exclusive reseller agreement entered into with Ericsson in 2012 to provide us with an extensive new global reseller channel. We compete 
with other telecommunications systems providers for our VARs' business and many of our VARs, including Ericsson, are free to market 
competing products. If Ericsson or any other VAR promotes a competitor's products to the detriment of our products or otherwise fails to 
market our products and services effectively, we could lose market share. In addition, the loss of a key VAR or the failure of VARs to provide 
adequate customer service could have a negative effect on customer satisfaction and could cause harm to our business. If we do not properly 
recruit and train VARs to sell, install and service our products, our business, financial condition and results of operations may suffer. Our use 
of VARs and other third party support partners, and the associated risks, are likely to increase as we expand sales outside of North America.

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We may have difficulty managing our growth, which could limit our ability to increase sales.

We have experienced significant growth in sales and operations in recent years. We expect to continue to expand our research and 

development, sales, marketing and support activities. Our historical growth has placed, and planned future growth is expected to continue to 
place, significant demands on our management, as well as our financial and operational resources, to:

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expand our manufacturing and distribution capacity;

increase our sales and marketing efforts;

broaden our customer support capabilities;

implement appropriate operational and financial systems; and

•  maintain effective financial disclosure controls and procedures.

If we cannot grow, or fail to manage our growth effectively, we may not be able to execute our business strategies and our business, 

financial condition and results of operations would be adversely affected.

We may not be able to protect our intellectual property, which could impair our ability to compete effectively.

We depend on certain proprietary technology for our success and ability to compete. As of December 31, 2012, we held 72 U.S. patents 

and had 36 pending U.S. patent applications. Two of the U.S. patents are also covered by granted international patents, one in five countries 
and the other in three countries. We currently have no pending international patent applications. We rely on intellectual property laws, as well 
as nondisclosure agreements, licensing arrangements and confidentiality provisions, to establish and protect our proprietary rights. U.S. 
patent, copyright and trade secret laws afford us only limited protection, and the laws of some foreign countries do not protect proprietary 
rights to the same extent. Our pending patent applications may not result in issued patents, and our issued patents may not be enforceable. 
Any infringement of our proprietary rights could result in significant litigation costs. Further, any failure by us to adequately protect our 
proprietary rights could result in our competitors offering similar products, resulting in the loss of our competitive advantage and decreased 
sales.

Despite our efforts to protect our proprietary rights, attempts may be made to copy or reverse engineer aspects of our products or to 

obtain and use information that we regard as proprietary. Accordingly, we may be unable to protect our proprietary rights against 
unauthorized third-party copying or use. Furthermore, policing the unauthorized use of our intellectual property would be difficult for us. 
Litigation may be necessary in the future to enforce our intellectual property rights, to protect our trade secrets or to determine the validity 
and scope of the proprietary rights of others. Litigation could result in substantial costs and diversion of resources and could harm our 
business.

We could become subject to litigation regarding intellectual property rights that could harm our business.

We may be subject to intellectual property infringement claims that are costly to defend and could limit our ability to use some 
technologies in the future. Third parties may assert patent, copyright, trademark or other intellectual property rights to technologies or rights 
that are important to our business. Such claims may involve non-practicing entities, patent holding companies or other adverse patent owners 
who have no relevant product revenue, and therefore our own issued and pending patents may provide little or no deterrence to suit from 
these entities. 

We have received in the past and expect that in the future we may receive, particularly as a public company, communications from 
competitors and other companies alleging that we may be infringing their patents, trade secrets or other intellectual property rights and/or 
offering licenses to such intellectual property or threatening litigation. In addition, we have agreed, and may in the future agree, to indemnify 
our customers for any expenses or liabilities resulting from claimed infringements of patents, trademarks or copyrights of third parties. Any 
claims asserting that our products infringe, or may infringe on, the proprietary rights of third parties, with or without merit, could be time-
consuming, resulting in costly litigation and diverting the efforts of our engineering teams and management. These claims could also result in 
product shipment delays or require us to modify our products or enter into royalty or licensing agreements. Such royalty or licensing 
agreements, if required, may not be available to us on acceptable terms, if at all.

The quality of our support and services offerings is important to our customers, and if we fail to continue to offer high quality support and 
services, we could lose customers, which would harm our business.

Once our products are deployed within our customers’ networks, they depend on our support organization to resolve any issues relating 

to those products. A high level of support is critical for the successful marketing and sale of our products. If we do not effectively assist our 
customers in deploying our products, succeed in helping them quickly resolve post-deployment issues or provide effective ongoing support, it 
could adversely affect our ability to sell our products to existing customers and harm our reputation with potential new customers. As a result, 
our failure to maintain high quality support and services could result in the loss of customers, which would harm our business.

Our products are highly technical and may contain undetected hardware errors or software bugs, which could harm our reputation and 
adversely affect our business.

Our products are highly technical and, when deployed, are critical to the operation of many networks. Our products have contained and 

may contain undetected errors, bugs or security vulnerabilities. Some errors in our products may only be discovered after a product has been 
installed and used by customers, and may in some cases only be detected under certain circumstances or after extended use. Any errors, bugs, 
defects or security vulnerabilities discovered in our products after commercial release could result in loss of revenues or delay in revenue 
recognition, loss of customers and increased service and warranty cost, any of which could adversely affect our business, operating results 
and financial condition. In addition, we could face claims for product liability, tort or breach of warranty. Our contracts with customers 

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contain provisions relating to warranty disclaimers and liability limitations, which may not be upheld. Defending a lawsuit, regardless of its 
merit, is costly and may divert management’s attention and adversely affect the market’s perception of us and our products. In addition, if our 
business liability insurance coverage proves inadequate or future coverage is unavailable on acceptable terms or at all, our business, operating 
results and financial condition could be adversely impacted.

Our estimates regarding future warranty obligations may change due to product failure rates, shipment volumes, field service obligations 
and rework costs incurred in correcting product failures. If our estimates change, the liability for warranty obligations may be increased, 
impacting future cost of revenue.

Our products are highly complex, and our product development, manufacturing and integration testing may not be adequate to detect 
all defects, errors, failures and quality issues. Quality or performance problems for products covered under warranty could adversely impact 
our reputation and negatively affect our operating results and financial position. The development and production of new products with high 
complexity often involves problems with software, components and manufacturing methods. If significant warranty obligations arise due to 
reliability or quality issues arising from defects in software, faulty components or manufacturing methods, our operating results and financial 
position could be negatively impacted by:

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cost associated with fixing software or hardware defects;

high service and warranty expenses;

high inventory obsolescence expense;

delays in collecting accounts receivable;

payment of liquidated damages for performance failures; and

declining sales to existing customers.

Our use of open source software could impose limitations on our ability to commercialize our products.

We incorporate open source software into our products. Although we closely monitor our use of open source software, the terms of 

many open source software licenses have not been interpreted by the courts, and there is a risk that such licenses could be construed in a 
manner that could impose unanticipated conditions or restrictions on our ability to sell our products. In such event, we could be required to 
make our proprietary software generally available to third parties, including competitors, at no cost, to seek licenses from third parties in 
order to continue offering our products, to re-engineer our products or to discontinue the sale of our products in the event re-engineering 
cannot be accomplished on a timely basis or at all, any of which could adversely affect our revenues and operating expenses.

If we are unable to obtain necessary third-party technology licenses, our ability to develop new products or product enhancements may be 
impaired.

While our current licenses of third-party technology generally relate to commercially available off-the-shelf technology, we may in the 

future be required to license additional technology from third parties to develop new products or product enhancements. These third-party 
licenses may be unavailable to us on commercially reasonable terms, if at all. Our inability to obtain necessary third-party licenses may force 
us to obtain substitute technology of lower quality or performance standards or at greater cost, any of which could harm the competitiveness 
of our products and result in lost revenues.

Our failure or the failure of our contract manufacturers to comply with applicable environmental and other legal regulations could 
adversely impact our results of operations.

The manufacture, assembly and testing of our products may require the use of hazardous materials that are subject to environmental, 

health and safety regulations, or materials subject to international laws restricting the use of conflict minerals. Our failure or the failure of our 
contract manufacturers to comply with any of these applicable requirements could result in regulatory penalties, legal claims or disruption of 
production. In addition, our failure or the failure of our contract manufacturers to properly manage the use, transportation, emission, 
discharge, storage, recycling or disposal of hazardous materials could subject us to increased costs or liabilities. Existing and future 
environmental regulations and other legal requirements may restrict our use of certain materials to manufacture, assemble and test products. 
Any of these consequences could adversely impact our results of operations by increasing our expenses and/or requiring us to alter our 
manufacturing processes.

Regulatory and physical impacts of climate change and other natural events may affect our customers and our contract manufacturers, 
resulting in adverse effects on our operating results.

As emissions of greenhouse gases continue to alter the composition of the atmosphere, affecting large-scale weather patterns and the 

global climate, any new regulation of greenhouse gas emissions may result in additional costs to our customers and our contract 
manufacturers. In addition, the physical impacts of climate change and other natural events, including changes in weather patterns, drought,  
rising ocean and temperature levels, earthquakes and tsunamis may impact our customers, suppliers, contract manufacturers, and our 
operations. These potential physical effects may adversely affect our revenues, costs, production and delivery schedules, and cause harm to 
our results of operations and financial condition.

We may pursue acquisitions, which involve a number of risks. If we are unable to address and resolve these risks successfully, such 
acquisitions could disrupt our business.

On November 2, 2012, we acquired Ericsson's fiber access assets. On February 22, 2011, we acquired Occam Networks. We may in 

the future acquire other businesses, products or technologies to expand our product offerings and capabilities, customer base and business. We 
have evaluated, and expect to continue to evaluate, a wide array of potential strategic transactions. We have limited experience making such 
acquisitions. Any of these transactions could be material to our financial condition and results of operations. The anticipated benefit of 

30

acquisitions may never materialize. In addition, the process of integrating acquired businesses, products or technologies may create 
unforeseen operating difficulties and expenditures. Some of the areas where we may face acquisition-related risks include:

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diversion of management time and potential business disruptions;

expenses, distractions and potential claims resulting from acquisitions, whether or not they are completed;

retaining and integrating employees from any businesses we may acquire, such as the 50 employees we acquired in connection 
with the Ericsson transaction;

issuance of dilutive equity securities or incurrence of debt;

integrating various accounting, management, information, human resource and other systems to permit effective management;

incurring possible write-offs, impairment charges, contingent liabilities, amortization expense or write-offs of goodwill;

difficulties integrating and supporting acquired products or technologies;

unexpected capital expenditure requirements;

insufficient revenues to offset increased expenses associated with the acquisition;

opportunity costs associated with committing capital to such acquisitions; and

acquisition-related litigation.

Foreign acquisitions would involve risks in addition to those mentioned above, including those related to integration of operations 
across different cultures and languages, currency risks and the particular economic, political and regulatory risks associated with specific 
countries. We may not be able to address these risks successfully, or at all, without incurring significant costs, delays or other operating 
problems. Our inability to address successfully such risks could disrupt our business.

Our obligation to issue performance bonds to satisfy requirements under RUS and ARRA-related contracts may negatively impact our 
working capital and financial condition.

We are sometimes required to issue performance bonds to satisfy requirements under our RUS and ARRA contracts. The performance 

bonds generally cover the full amount of the contract. Upon our performance under the contract and acceptance by the customer, the 
performance bond is released. The time period between issuing the performance bond and its release can be lengthy. We issue letters of credit 
under our existing credit facility to support a portion of these performance bonds. In the event we do not have sufficient capacity under our 
credit facility to support these bonds, we will have to provide certificates of deposit or other security, which could materially impact our 
working capital or limit our ability to satisfy such contract requirements. In the event that we are unable to issue such bonds, we may lose 
business and customers who purchase under RUS and ARRA contracts. In addition, if we exhaust our credit facility or working capital 
reserves in issuing such bonds, we may be required to eliminate or curtail expenditures to mitigate the impact on our working capital or 
financial condition.

Our use of and reliance upon development resources in China may expose us to unanticipated costs or liabilities.

We operate a wholly foreign owned enterprise, in Nanjing, China, where a dedicated team of engineers performs quality assurance, 

cost reduction and other engineering work. We also outsource a portion of our software development to a team of software engineers based in 
Shenyang, China. Our reliance upon development resources in China may not enable us to achieve meaningful product cost reductions or 
greater resource efficiency. Further, our development efforts and other operations in China involve significant risks, including:

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difficulty hiring and retaining appropriate engineering resources due to intense competition for such resources and resulting 
wage inflation;

the knowledge transfer related to our technology and exposure to misappropriation of intellectual property or confidential 
information, including information that is proprietary to us, our customers and third parties;

heightened exposure to changes in the economic, security and political conditions of China;

fluctuation in currency exchange rates and tax risks associated with international operations; and

development efforts that do not meet our requirements because of language, cultural or other differences associated with 
international operations, resulting in errors or delays.

Difficulties resulting from the factors above and other risks related to our operations in China could expose us to increased expense, 

impair our development efforts, harm our competitive position and damage our reputation.

Our customers are subject to government regulation, and changes in current or future laws or regulations that negatively impact our 
customers could harm our business.

The FCC has jurisdiction over all of our U.S. customers. FCC regulatory policies that create disincentives for investment in access 

network infrastructure or impact the competitive environment in which our customers operate may harm our business. For example, future 
FCC regulation affecting providers of broadband Internet access services could impede the penetration of our customers into certain markets 
or affect the prices they may charge in such markets. Furthermore, many of our customers are subject to FCC rate regulation of interstate 
telecommunications services, and are recipients of Connect America Fund capital incentive payments, which are intended to subsidize 
broadband and telecommunications services in areas that are expensive to serve. In early October 2011, the chairman of the FCC outlined a 
plan to transform the Universal Service Fund, an $8 billion fund that is paid for by the nation's telephone customers and was used to subsidize 
basic telephone service in rural areas, into one that will help expand broadband Internet service to 18 million Americans who lack high-speed 
access. Changes to these programs could change the ability of IOCs to access capital and reduce our revenue opportunities. 

31

In addition, many of our customers are subject to state regulation of intrastate telecommunications services, including rates for such 

services, and may also receive funding from state universal service funds. Changes in rate regulations or universal service funding rules, 
either at the federal or state level, could adversely affect our customers' revenues and capital spending plans. In addition, various international 
regulatory bodies have jurisdiction over certain of our non-U.S. customers. Changes in these domestic and international standards, laws and 
regulations, or judgments in favor of plaintiffs in lawsuits against CSPs based on changed standards, laws and regulations could adversely 
affect the development of broadband networks and services. This, in turn, could directly or indirectly adversely impact the communications 
industry in which our customers operate. 

Many jurisdictions are also evaluating or implementing regulations relating to cyber security, privacy and data protection, which can 

affect the market and requirements for networking and communications equipment. To the extent our customers are adversely affected by 
laws or regulations regarding their business, products or service offerings, our business, financial condition and results of operations would 
suffer.

We may be subject to governmental export and import controls that could subject us to liability or impair our ability to compete in 
additional international markets.

Our products may be or become subject to U.S. export controls that will restrict our ability to export them outside of the free-trade 
zones covered by the North American Free Trade Agreement, Central American Free Trade Agreement and other treaties and laws. Therefore, 
future international shipments of our products may require export licenses or export license exceptions. In addition, the import laws of other 
countries may limit our ability to distribute our products, or our customers’ ability to buy and use our products, in those countries. Changes in 
our products or changes in export and import regulations may create delays in the introduction of our products in international markets, 
prevent our customers with international operations from deploying our products or, in some cases, prevent the export or import of our 
products to certain countries altogether. Any change in export or import regulations or related legislation, shift in approach to the enforcement 
or scope of existing regulations, or change in the countries, persons or technologies targeted by such regulations, could negatively impact our 
ability to sell our products to existing or potential international customers.

If we lose any of our key personnel, or are unable to attract, train and retain qualified personnel, our ability to manage our business and 
continue our growth would be negatively impacted.

Our success depends, in large part, on the continued contributions of our key management, engineering, sales and marketing personnel, 

many of whom are highly skilled and would be difficult to replace. None of our senior management or key technical or sales personnel is 
bound by a written employment contract to remain with us for a specified period. In addition, we do not currently maintain key man life 
insurance covering our key personnel. If we lose the services of any key personnel, our business, financial condition and results of operations 
may suffer.

Competition for skilled personnel, particularly those specializing in engineering and sales, is intense. We cannot be certain that we will 
be successful in attracting and retaining qualified personnel, or that newly hired personnel will function effectively, both individually and as a 
group. In particular, we must continue to expand our direct sales force, including hiring additional sales managers, to grow our customer base 
and increase sales. In addition, if we offer employment to personnel employed by competitors, we may become subject to claims of unfair 
hiring practices, and incur substantial costs in defending ourselves against these claims, regardless of their merits. If we are unable to 
effectively recruit, hire and utilize new employees, execution of our business strategy and our ability to react to changing market conditions 
may be impeded, and our business, financial condition and results of operations may suffer.

Volatility or lack of performance in our stock price may also affect our ability to attract and retain our key personnel. Our executive 

officers and employees hold a substantial number of shares of our common stock and vested stock options. Employees may be more likely to 
leave us if the shares they own or the shares underlying their vested options have significantly appreciated in value relative to the original 
purchase prices of the shares or the exercise prices of the options, or if the exercise prices of the options that they hold are significantly above 
the market price of our common stock. If we are unable to retain our employees, our business, operating results and financial condition will 
be harmed.

If we fail to maintain proper and effective internal controls, our ability to produce accurate financial statements on a timely basis could be 
impaired, which would adversely affect our operating results, our ability to operate our business and our stock price.

Ensuring that we have adequate internal financial and accounting controls and procedures in place to produce accurate financial 
statements on a timely basis is a costly and time-consuming effort that needs to be re-evaluated frequently. We have in the past discovered, 
and may in the future discover, areas of our internal financial and accounting controls and procedures that need improvement.

Our management is responsible for establishing and maintaining adequate internal control over financial reporting to provide 
reasonable assurance regarding the reliability of our financial reporting and the preparation of financial statements for external purposes in 
accordance with U.S. generally accepted accounting principles. Our management does not expect that our internal control over financial 
reporting will prevent or detect all error and all fraud. A control system, no matter how well designed and operated, can provide only 
reasonable, not absolute, assurance that the control system’s objectives will be met. Because of the inherent limitations in all control systems, 
no evaluation of controls can provide absolute assurance that misstatements due to error or fraud will not occur or that all control issues and 
instances of fraud, if any, within our company will have been detected.

We are required to comply with Section 404 of the Sarbanes-Oxley Act ("SOX"), which requires us to expend significant resources in 
developing the required documentation and testing procedures. We cannot be certain that the actions we have taken and are taking to improve 
our internal controls over financial reporting will be sufficient to maintain effective internal controls over financial reporting in subsequent 
reporting periods, or that we will be able to implement our planned processes and procedures in a timely manner. In addition, new and revised 
accounting standards and financial reporting requirements may occur in the future, and implementing changes required by new standards, 

32

requirements or laws may require a significant expenditure of our management’s time, attention and resources and may adversely affect our 
reported financial results. If we are unable to produce accurate financial statements on a timely basis, investors could lose confidence in the 
reliability of our financial statements, which could cause the market price of our common stock to decline and make it more difficult for us to 
finance our operations and growth.

Interruptions, failures or material breaches in our information technology and communications systems could harm our business, 
customer relations and financial condition.

Information technology helps us operate efficiently, interface with customers, maintain financial accuracy and efficiency and 
accurately produce our financial statements. If we do not allocate and effectively manage the resources necessary to build and sustain the 
proper technology infrastructure, we could be subject to transaction errors, processing inefficiencies, the loss of customers, business 
disruptions or the loss of or damage to intellectual property through security breach. If our data management systems do not effectively 
collect, store, process and report relevant data for the operation of our business, whether due to equipment malfunction or constraints, 
software deficiencies or human error, our ability to effectively plan, forecast and execute our business plan and comply with applicable laws 
and regulations will be impaired, perhaps materially. Any such impairment could materially and adversely affect our financial condition, 
results of operations, cash flows and the timeliness with which we report our internal and external operating results.

We have applied multiple layers of security to control access to our information technology systems. We also use encryption and 
authentication technologies to secure the transmission and storage of data. These security measures may be compromised as a result of third-
party security breaches, employee error, malfeasance, faulty password management or other irregularity, and result in persons obtaining 
unauthorized access to our data or accounts. Third parties may attempt to fraudulently induce employees into disclosing user names, 
passwords or other sensitive information, which may in turn be used to access our information technology systems.

While we apply best practice policies and devote significant resources to network security, data encryption and other security measures 

to protect our information technology and communications systems and data, these security measures cannot provide absolute security. We 
may experience a breach of our systems and may be unable to protect sensitive data. The costs to us to eliminate or alleviate network security 
problems, bugs, viruses, worms, malicious software programs and security vulnerabilities could be significant, and our efforts to address 
these problems may not be successful and could result in unexpected interruptions, delays, cessation of service and may harm our business 
operations.

Although our systems have been designed around industry-standard architectures to reduce downtime in the event of outages or 
catastrophic occurrences, they remain vulnerable to damage or interruption from earthquakes, floods, fires, power loss, telecommunication 
failures, terrorist attacks, cyber-attacks, computer viruses, computer denial-of-service attacks, human error, hardware or software defects or 
malfunctions, and similar events or disruptions. Some of our systems are not fully redundant, and our disaster recovery planning is not 
sufficient for all eventualities. Our systems are also subject to break-ins, sabotage, and intentional acts of vandalism. Despite any precautions 
we may take, the occurrence of a natural disaster, a decision by any of our third-party hosting providers to close a facility we use without 
adequate notice for financial or other reasons, or other unanticipated problems at our hosting facilities could cause system interruptions and 
delays, and result in loss of critical data and lengthy interruptions in our services.

We incur significant increased costs as a result of operating as a public company, which may adversely affect our operating results and 
financial condition.

As a public company, we incur significant accounting, legal and other expenses that we did not incur as a private company, including 

costs associated with our public company reporting requirements. We also anticipate that we will continue to incur costs associated with 
corporate governance requirements, including requirements under the SOX and the Dodd-Frank Wall Street Reform and Consumer Protection 
Act ("Dodd-Frank"), as well as rules implemented by the SEC, and the New York Stock Exchange ("NYSE"). Furthermore, these laws and 
regulations could make it more difficult or more costly for us to obtain certain types of insurance, including director and officer liability 
insurance, and we may be forced to accept reduced policy limits and coverage or incur substantially higher costs to obtain the same or similar 
coverage. The impact of these requirements could also make it more difficult for us to attract and retain qualified persons to serve on our 
board of directors, our board committees or as executive officers.

New laws and regulations as well as changes to existing laws and regulations affecting public companies, including the provisions of 

SOX and Dodd-Frank and rules adopted by the SEC and the NYSE, would likely result in increased costs to us as we respond to their 
requirements. We are investing resources to comply with evolving laws and regulations, and this investment may result in increased general 
and administrative expense and a diversion of management's time and attention from revenue generating activities to compliance activities.

Risks Related to Our Acquisition of the Fiber Access Assets of Ericsson

Our future results may differ materially from those in our current financial statements and financial forecasts, and the potential benefits 
of the transactions may not be realized. 

As a result of our acquisition of Ericsson's fiber access assets and the establishment of a non-exclusive global reseller agreement 
between the two companies, our future results may be materially different from those contained in our current financial statements and 
financial forecasts. In addition, potential growth, expected financial results, perceived synergies and anticipated opportunities may not be 
realized through the ongoing integration of our business with that of the Ericsson fiber access business. 

The Ericsson transaction could cause disruptions and materially adversely affect the future business and operations of the combined 
organization.

In connection with the Ericsson transaction, it is possible that some customers, suppliers and other persons with whom we or Ericsson 

have had a business relationship may delay or defer certain business decisions, or determine to purchase a competitor's products. In particular, 
33

customers could be reluctant to purchase products due to uncertainty about the direction of our combined technology and product road map, 
and uncertainty regarding the willingness of the combined organization to support and service existing products after the transactions. If 
customers, suppliers or other persons, delay or defer business decisions, or purchase a competitor's products, it could negatively impact 
revenues, earnings and cash flows of the combined organization, as well as the market price of our common stock. 

Risks Related to Ownership of Our Common Stock

Our stock price may be volatile, and the value of an investment in our common stock may decline.

The trading price of our common stock has been, and is likely to continue to be, volatile, which means that it could decline 

substantially within a short period of time and could be subject to wide fluctuations in response to various factors, some of which are beyond 
our control. These factors include those discussed in the “Risk Factors” section of this Form 10-K and others such as:

• 

• 

• 

• 

• 

• 

• 

• 

• 

quarterly variations in our results of operations or those of our competitors;

failures by us to meet any guidance regarding our anticipated results that we have previously provided;

changes in earnings estimates or recommendations by securities analysts;

announcements by us or our competitors of new products, significant contracts, commercial relationships, acquisitions or 
capital commitments;

developments with respect to intellectual property rights;

our ability to develop and market new and enhanced products on a timely basis;

our commencement of, or involvement in, litigation;

changes in governmental regulations or in the status of our regulatory approvals; and

a slowdown in the communications industry or the general economy.

In recent years, the stock market in general, and the market for technology companies in particular, has experienced extreme price and 

volume fluctuations that have often been unrelated or disproportionate to the operating performance of those companies. Broad market and 
industry factors may seriously affect the market price of our common stock, regardless of our actual operating performance. In addition, in 
the past, following periods of volatility in the overall market and the market price of a particular company’s securities, securities class action 
litigation has often been instituted against these companies. This litigation, if instituted against us, could result in substantial costs and a 
diversion of our management’s attention and resources.

If securities or industry analysts do not publish research or reports about our business or if they issue an adverse or misleading opinion 
regarding our stock, our stock price and trading volume could decline.

The trading market for our common stock will be influenced by the research and reports that industry or securities analysts publish 

about us or our business. If any of the analysts who cover us issue an adverse or misleading opinion regarding our stock, our stock price 
would likely decline. If one or more of these analysts cease coverage of our company or fail to publish reports on us regularly, we could lose 
visibility in the financial markets, which in turn could cause our stock price or trading volume to decline.

Provisions in our charter documents and under Delaware law could discourage a takeover that stockholders may consider favorable and 
may lead to entrenchment of management.

Our amended and restated certificate of incorporation and amended and restated bylaws contain provisions that could have the effect of 

delaying or preventing changes in control or changes in our management without the consent of our board of directors. These provisions 
include:

• 

• 

• 

• 

• 

• 

• 

a classified board of directors with three-year staggered terms, which may delay the ability of stockholders to change the 
membership of a majority of our board of directors;

no cumulative voting in the election of directors, which limits the ability of minority stockholders to elect director candidates;

the exclusive right of our board of directors to elect a director to fill a vacancy created by the expansion of the board of 
directors or the resignation, death or removal of a director, which prevents stockholders from being able to fill vacancies on 
our board of directors;

the ability of our board of directors to issue shares of preferred stock and to determine the price and other terms of those 
shares, including preferences and voting rights, without stockholder approval, which could be used to significantly dilute the 
ownership of a hostile acquirer;

a prohibition on stockholder action by written consent, which forces stockholder action to be taken at an annual or special 
meeting of our stockholders;

the requirement that a special meeting of stockholders may be called only by the chairman of the board of directors, the chief 
executive officer or the board of directors, which may delay the ability of our stockholders to force consideration of a proposal 
or to take action, including the removal of directors; and

advance notice procedures that stockholders must comply with in order to nominate candidates to our board of directors or to 
propose matters to be acted upon at a stockholders’ meeting, which may discourage or deter a potential acquirer from 
conducting a solicitation of proxies to elect the acquirer’s own slate of directors or otherwise attempting to obtain control of 
us.

34

We are also subject to certain anti-takeover provisions under Delaware law. Under Delaware law, a corporation may not, in general, 

engage in a business combination with any holder of 15% or more of its capital stock unless the holder has held the stock for three years or, 
among other things, the board of directors has approved the transaction.

We may need additional capital in the future to finance our business.

We may need to raise additional capital to fund operations in the future. Although we believe that, based on our current level of 
operations and anticipated growth, our existing cash and cash equivalents will provide adequate funds for ongoing operations, planned capital 
expenditures and working capital requirements for at least the next 12 months, we may need additional capital if our current plans and 
assumptions change. If future financings involve the issuance of equity securities, our then-existing stockholders would suffer dilution. If we 
raised additional debt financing, and/or negotiate a new credit agreement to replace our expiring line of credit, we may be subject to 
restrictive covenants that limit our ability to conduct our business. We may not be able to raise sufficient additional funds on terms that are 
favorable to us, if at all. If we fail to raise sufficient funds and continue to incur losses, our ability to fund our operations, take advantage of 
strategic opportunities, develop products or technologies or otherwise respond to competitive pressures could be significantly limited. Any 
failure to obtain financing when and as required could force us to curtail our operations, which would harm our business.

We do not currently intend to pay dividends on our common stock and, consequently, our stockholder’s ability to achieve a return on their 
investment will depend on appreciation in the price of our common stock.

We do not currently intend to pay any cash dividends on our common stock for the foreseeable future. We currently intend to invest our 

future earnings, if any, to fund our growth. Additionally, the terms of our credit facility restrict our ability to pay dividends. Therefore, our 
stockholders are not likely to receive any dividends on our common stock for the foreseeable future.

ITEM 1B. 

Unresolved Staff Comments.

None.

ITEM 2.  

Properties.

We currently lease approximately 287,300 square feet of office space worldwide. In November 2012, we entered into a lease agreement 

for our office in San Jose, California that expires in August 2018. Information concerning our principal leased properties as of December 31, 
2012 is set forth below:

Location

Petaluma, California (1)

Principal Use

Corporate headquarters, sales, marketing, product design, service 
and repair engineering, distribution, research and development

Santa Barbara, California

Product design, research and development

San Jose, California
Fremont, California (2)

Minneapolis, Minnesota

Product design, research and development

Research and development, service and repair engineering

Product design, research and development, service and repair 
engineering

Nanjing, China

Research and development

Acton, Massachusetts

Research and development

Richardson, Texas

Service and repair engineering

Square
Footage

Lease
Expiration Date

82,100

February 2014

51,000

46,100

36,000

33,200

July 2014

August 2018

July 2015

March 2014

26,600

February  2016

6,200

6,100

287,300

June 2016

July 2017

(1)  On January 28, 2013, we entered into an amendment to this Petaluma lease and extended the expiration date to February 2019. See Note 14, 

"Subsequent Event" of the Notes to Consolidated Financial Statements in this Form 10-K for details.

(2)  A portion of the property is sublet under a sublease expiring in 2015. The remaining area of the property is estimated to be vacated in March 2013 for 

sublease. Employees in this location will be consolidated into our San Jose, California location.

We believe that our facilities are in good condition and are generally suitable to meet our needs for the foreseeable future. However, we 

may continue to seek additional space as needed, and we believe this space will be available on commercially reasonable terms.

ITEM 3.  

Legal Proceedings

For a description of our material pending legal proceedings, please refer to Note 5, “Commitments and Contingencies – Litigation” of 

the Notes to Consolidated Financial Statements included in Part II, Item 8 of this Annual Report on Form 10-K, which is incorporated by 
reference.

ITEM 4.  

Mine Safety Disclosures.

Not applicable.

35

                                                                 
PART II

ITEM 5. 

Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Comparative Stock Prices

Our common stock has been trading on the New York Stock Exchange, under the trading symbol “CALX” since our initial public 
offering on March 24, 2010. Prior to this time, there was no public market for our common stock. The following table sets forth, for the fiscal 
periods indicated, the high and low sale prices per share of our common stock as reported on NYSE.

Fiscal Year 2012
First Quarter
Second Quarter
Third Quarter
Fourth Quarter

Fiscal Year 2011
First Quarter
Second Quarter
Third Quarter
Fourth Quarter

High

Low

$

$

12.21
9.48
8.26
7.80

High

22.53   
22.97   
22.47   
10.63   

$

$

6.08
6.65
4.25
5.47

Low

14.99
18.30
9.73
5.60

Number of Common Stock Holders and Number of Shares Outstanding

On February 14, 2013, there were approximately 341 stockholders of record of our common stock who held an aggregate of 48,912,031 

shares of our common stock. The closing price of our common stock as of February 14, 2013 was $8.60. A substantially greater number of 
holders of Calix common stock are street name or beneficial holders, whose shares are held of record by banks, brokers and other financial 
institutions.

Dividends

We have never declared or paid any cash dividends on our common stock. We do not currently intend to pay any cash dividends on our 

common stock in the foreseeable future.

Recent Sales of Unregistered Securities

None.

Issuer Purchases of Equity Securities 

None.

Performance Graph

The following graph shows a comparison of the cumulative total shareholder return on our common stock with the cumulative total 
returns of the NYSE Composite Index and the Morningstar Communication Equipment Index. The graph tracks the performance of a $100 
investment in our common stock and in each of the indexes during the period from March 24, 2010 (the date our common stock commenced 
trading on NYSE) through December 31, 2012. Data for the NYSE Composite Index and the Morningstar Communication Equipment Index 
assume reinvestment of dividends. Shareholder returns over the indicated period are based on historical data and should not be considered 
indicative of future shareholder returns.

36

This performance graph shall not be deemed “soliciting material” or to be “filed” with the Securities and Exchange Commission for 
purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities under that Section, and shall 
not be deemed to be incorporated by reference into any filing of Calix, Inc. under the Securities Act of 1933, as amended.

ITEM 6.  

Selected Financial Data.

The following selected consolidated financial data should be read in conjunction with our consolidated financial statements and the 
related notes thereto, of this Form 10-K, the section titled “Management’s Discussion and Analysis of Financial Condition and Results of 
Operations” and the other financial information and data appearing elsewhere in this Form 10-K. The selected financial data included in this 
section is not intended to replace and is not a substitute for, the financial statements and related notes in this Form 10-K.

We derived the statements of operations data for the years ended December 31, 2012, 2011 and 2010 and the balance sheet data as of 

December 31, 2012 and 2011 from our audited financial statements and related notes thereto of this Form 10-K. We derived the statements of 
operations data for the years ended December 31, 2009 and 2008, and the balance sheet data as of December 31, 2010, 2009 and 2008 from 
our audited financial statements and related notes which are not included in this Form 10-K. Historical results for any prior period are not 
necessarily indicative of future results for any period.

37

 
Statements of Operations Data:
Revenue
Cost of revenue:

Products and services (2)
Acquisition-related expenses
Amortization of intangible assets

Total cost of revenue
Gross profit
Operating expenses:

Research and development (2)
Sales and marketing (2)
General and administrative (2)
Acquisition-related expenses (2)
Amortization of intangible assets

Total operating expenses
Loss from operations
Interest and other income (expense), net (3)
Loss before provision for (benefit from) income taxes
Provision for (benefit from) income taxes
Net loss
Preferred stock dividends
Net loss attributable to common stockholders
Net loss per common share:

Basic and diluted

Weighted-average number of shares used to compute net
loss per common share:
Basic and diluted

Balance Sheet Data:
Cash, cash equivalents and marketable securities
Working capital
Total assets
Current and long-term loans payable
Preferred stock warrant liabilities
Convertible preferred stock
Common stock and additional paid-in capital
Total stockholders’ equity (deficit)

Years Ended December 31,

   2012 (1)

    2011 (1)  

2010

2009

2008

(In thousands, except per share data)

$

330,218

$

344,669

$

287,043

$

232,947

$

250,463

185,103
—
7,539
192,642
137,576

66,748
62,129
26,114
1,401
10,208
166,600
(29,024)
856
(28,168)
158
(28,326)
—
(28,326)

(0.59)

195,698
19,966
9,552
225,216
119,453

67,725
55,551
27,002
12,927
8,569
171,774
(52,321)
(5)
(52,326)
224
(52,550)
—
(52,550)

(1.15)

168,873
—
5,440
174,313
112,730

55,412
42,121
27,998
3,942
740
130,213
(17,483)
(989)
(18,472)
81
(18,553)
900
(19,453)

(0.65)

150,863
—
5,440
156,303
76,644

46,132
33,486
15,613
—
740
95,971
(19,327)
(3,466)
(22,793)
(352)
(22,441)
3,747
(26,188)

(6.48)

$

$

$

$

$

$

165,925
—
5,440
171,365
79,098

44,348
31,627
15,253
—
740
91,968
(12,870)
(130)
(13,000)
(81)
(12,919)
4,065
(16,984)

(4.27)

$

$

48,180

45,546

29,778

4,040

3,975

As of December 31,

 2012 (1)

 2011 (1)

2010

2009

2008

(In thousands, except per share data)

46,995
84,255
377,897
—
—
—
761,454
269,075

$

38,938    $
77,745   
358,103   
—   
—   
—   
741,504   
277,417   

98,324    $
126,957   
257,556   
—   
—   
—   
606,907   
195,303   

68,049    $
77,999   
241,116   
20,000   
195   
479,628   
52,841   

(339,358)

23,214
41,403
189,455
21,000
232
426,403
43,597
(322,397)

$

$

$

38

  
  
(1) We acquired Ericsson's fiber access assets in November 2012 and Occam in February 2011. Our Consolidated Statements of Operations 
and Consolidated Balance Sheets data include the results of these acquired businesses only for periods subsequent to their respective 
acquisition dates. See Note 2, “Business Combinations" of the Notes to the Consolidated Financial Statements in this Form 10-K for 
more details.

(2) Includes stock-based compensation as follows:

Cost of revenue

$

Research and development

Sales and marketing

General and administrative

Acquisition-related expenses

2012

2011

2010

2009

2008

1,433

4,227

5,160

6,617

—

$

1,503

4,828

4,500

9,538

1,234

$

1,745

5,966

4,555

13,309

—

$

682

$

2,657

1,739

4,118

—

619

3,189

1,998

4,134

—

Total

$

17,437

$

21,603

$

25,575

$

9,196

$

9,940

(3) 2012 includes $1.0 million gain on bargain purchase of business; 2010, 2009, and 2008 include $1.2 million, $3.9 million, and $2.1 

million of interest expense, respectively, which are primarily for a term loan that was repaid in May 2010.

ITEM 7.  

Management’s Discussion and Analysis of Financial Condition and Results of Operations

The Management’s Discussion and Analysis of Financial Condition and Results of Operations contains forward-looking statements 
regarding future events and our future results that are subject to the safe harbors created under the Securities Act of 1933 (the “Securities 
Act”) and the Securities Exchange Act of 1934 (the “Exchange Act”). All statements other than statements of historical facts are statements 
that could be deemed forward-looking statements. These statements are based on current expectations, estimates, forecasts, and projections 
about the industries in which we operate and the beliefs and assumptions of our management. Words such as “may,” “will,” “expects,” 
“plans,” “anticipates,” “estimates,” “potential,” or “continue” or the negative thereof or other comparable terminology. In addition, any 
statements that refer to projections of our future financial performance, our anticipated growth and trends in our businesses, and other 
characterizations of future events or circumstances are forward-looking statements. Readers are cautioned that these forward-looking 
statements are only predictions and are subject to risks, uncertainties, and assumptions that are difficult to predict, including those identified 
below, as well as on the inside back cover of this Annual Report to Shareholders and under “Part I, Item 1A. Risk Factors,” and elsewhere in 
report on Form 10-K. Therefore, actual results may differ materially and adversely from those expressed in any forward-looking statements. 
All forward-looking statements and reasons why results may differ included in this report are made as of the date hereof, and we assume no 
obligation to update these forward-looking statements or reasons why actual results might differ.

Overview

We are a leading provider in North America of broadband communications access systems and software for fiber- and copper-based 

network architectures that enable communications service providers to connect to their residential and business subscribers. We enable CSPs 
to provide a wide range of revenue-generating services, from basic voice and data to advanced broadband services, over legacy and next-
generation access networks. We focus solely on CSP access networks, the portion of the network that governs available bandwidth and 
determines the range and quality of services that can be offered to subscribers. We develop and sell carrier-class hardware and software 
products, which is referred to as the Unified Access portfolio that are designed to enhance and transform CSP access networks to meet the 
changing demands of subscribers rapidly and cost-effectively.

We market our access systems and software to CSPs globally through our direct sales force as well as a limited number of resellers. As 

of December 31, 2012, over sixteen million ports of our Unified Access portfolio have been deployed at more than 1,150 CSPs worldwide, 
whose networks serve over 100 million subscriber lines in total. Our customers include many of the world's largest communications 
providers. In addition, we have over 425 commercial video customers and have enabled over 750 customers to deploy gigabit passive optical 
network, Active Ethernet and point-to-point Ethernet fiber access networks. 

Our revenue increased from $287.0 million for 2010 to $344.7 million for 2011, and then decreased to $330.2 million for 2012. In 

2011, our revenues increased over 2010 primarily due to higher shipment revenue resulting from an increase in our customer base from the 
Occam acquisition. However in the second half of fiscal 2011, we experienced a slowdown in business primarily related to continued delays 
in Broadband Stimulus awards under the American Recovery and Reinvestment Act of 2009 becoming shippable orders due to challenges 
that a number of our awarded customers were facing in navigating some of the bureaucratic hurdles of the program. Other factors that 
contributed to this slowdown include reduced investment in the traditional networks at one of our major customers, the competitive 
environment, weak macro-economic conditions and fiber shortages in certain portions of the market caused by the tsunami in Northern Japan. 
During the first half of 2012, we experienced continued softness in our business due to lower demand across multiple customer markets. We 
believe this was due to a slowdown in capital expenditures by service providers increasingly concerned about macro-economic conditions and 
uncertainties associated with the implementation of regulatory reforms.  We experienced steady improvement during the remainder of 2012 
and completed the year with stronger results compared to the first half of 2012. Revenue growth will depend on our ability to continue to sell 
our access systems and software to existing customers and to attract new customers, including in particular, those customers in the large CSP 
and international markets. Additionally, we expect our acquisition of Ericsson's fiber access assets to have a positive impact to revenue 
beyond 2012. Since our inception we have incurred significant losses, and as of December 31, 2012, we had an accumulated deficit of $492.5 

39

million. Our net loss was $28.3 million, $52.6 million, and $18.6 million for the years ended December 31, 2012, 2011, and 2010, 
respectively.

Revenue fluctuations result from many factors, including but not limited to: increases or decreases in customer orders for our products 

and services, large customer purchase agreements with delayed revenue recognition, varying budget cycles for our customers and seasonal 
buying patterns of our customers. More specifically, our customers tend to spend less in the first fiscal quarter as they are finalizing their 
annual budgets. Customers then typically begin to purchase more products during our second and third fiscal quarters.  Finally, in our fourth 
fiscal quarter, customer purchases typically increase as they are attempting to spend the rest of their budget for the year. As of December 31, 
2012, our deferred revenue of $55.1 million primarily included certain contracts with customers who receive government supported loans and 
grants from the U.S. Department of Agriculture’s Rural Utility Service (“RUS”) that include installation services, services, special customer 
arrangements and ratably recognized services. The timing of deferred recognition may cause significant fluctuations in our revenue and 
operating results from period to period.

Cost of revenue is strongly correlated to revenue and will tend to fluctuate from all of the aforementioned factors that could impact 

revenue. Other factors that impact cost of revenue include changes in the mix of products delivered to our customers and changes in the cost 
of our inventory. Cost of revenue includes fixed expenses related to our internal operations, which could impact our cost of revenue as a 
percentage of revenue if there are large sequential fluctuations to revenue.

Our gross profit and gross margin have been, and will likely be, impacted by several factors, including new product introduction or 
upgrades to existing products, changes in customer mix, changes in the mix of products demanded and sold, shipment volumes, changes in 
our product costs, changes in pricing and the extent of customer rebates and incentive programs. We believe our gross margin could increase 
due to favorable changes in these factors, for example, increases in sales of our advanced E-Series Ethernet service access platforms, 
upgrades to our C7 platform, new introductions of our P-Series optical network terminals and reductions in the impact of rebate or similar 
programs. We believe our gross margin could decrease due to unfavorable changes in factors such as increased product costs, pricing 
decreases due to competitive pressure and an unfavorable customer or product mix. Changes in these factors could have a material impact on 
our future average selling prices and unit costs. Also, the timing of deferred revenue recognition and related deferred costs can have a 
material impact on our gross profit and gross margin results. The timing of recognition and the relative size of these arrangements could cause 
large fluctuations in our gross profit from period to period.

Our operating expenses have fluctuated based on the following factors: timing of variable compensation expenses due to fluctuations 

in order volumes, timing of salary increases which have historically occurred in the second quarter, timing of bonus accrual due to changes in 
the Company’s performance, timing of research and development expenses including prototype builds and intermittent outsourced 
development projects, and increases in stock-based compensation expenses resulting from modifications to outstanding stock options. Our 
operating expenses for fiscal 2012 include acquisition-related expenses and amortization of intangible assets from our acquisition of 
Ericsson's fiber access assets as discussed in more detail below. We anticipate that our operating expenses will increase but will decline as a 
percentage of revenue over time.

As a result of the fluctuations described above and a number of other factors, many of which are outside our control, our annual 

operating results fluctuate from year to year. You should not rely on our past results as an indication of our future performance.

Acquisition of Ericsson's Fiber Access Assets

On November 2, 2012, we acquired the fiber access assets of Ericsson, including the Ericsson EDA 1500 GPON solution and its 

complementary ONT portfolio, under an Asset Purchase Agreement. Total consideration for the purchase was $12.0 million in cash. As a 
result of this acquisition, Calix hired 50 U.S.-based employees of Ericsson, and transitioned ongoing support of the acquired products from 
Ericsson to Calix. 

In connection with this acquisition, Calix and Ericsson also signed a non-exclusive global reseller agreement, under which Calix 
became Ericsson's preferred global partner for broadband access applications. We expect this partnership to provide Calix with an extensive 
new global reseller channel, and we believe our acquisition of Ericsson's fiber access portfolio delivers powerful new complements to our 
industry-leading Unified Access portfolio. We expect that this partnership will also provide Ericsson's existing fiber access customers with 
world-class support and maintenance, and an expanded portfolio of access systems and software from a leading company totally focused on 
access.

The transaction is accounted for using the acquisition method of accounting in accordance with the accounting standard for business 
combinations. We have included the financial results of the acquired Ericsson's fiber access assets in the Consolidated Financial Statements 
from the date of acquisition. See Note 2, “Business Combinations” of the Notes to Consolidated Financial Statements in this Form 10-K for 
additional information related to this acquisition. We expect the acquisition to have a positive impact on our international business over time.

Acquisition of Occam Networks

On February 22, 2011, we completed our acquisition of Occam, a provider of innovative broadband access products designed to enable 

telecom service providers to offer bundled voice, video and high speed internet, or Triple Play, services over both fiber optic and copper 
networks in a stock and cash transaction valued at approximately $213.1 million which consisted of $94.5 million of cash consideration and a 
value of $118.6 million of common stock and equity awards issued. The combined organization provides CSPs globally with an enhanced 
portfolio of advanced broadband access systems, and accelerates innovation across our expanded Unified Access portfolio. The acquisition 
resulted in more access options over both fiber and copper for CSPs to deploy, which could expedite the proliferation of advanced broadband 
services to both residential and business subscribers, including such services as high-speed Internet, IPTV, VOIP, Ethernet business services, 
and other advanced broadband applications.

40

As a result of this acquisition, we recorded $50.6 million in goodwill and $97.7 million in other intangible assets. We are amortizing 
the finite-lived intangible assets over their useful lives. See “Critical Accounting Policies and Use of Estimates-Valuation of Goodwill and 
Intangible Assets” section below for information relating to these items and our test for impairment. Under purchase accounting rules, we 
revalued the Occam assets and liabilities acquired at the time of the acquisition, based on their fair value. See Note 2, “Business 
Combinations” of the Notes to Consolidated Financial Statements included in this report for additional information related to this acquisition.

Critical Accounting Policies and Estimates

Our financial statements are prepared in accordance with U.S. GAAP. These accounting principles require us to make certain estimates 

and judgments that can affect the reported amounts of assets and liabilities as of the date of the financial statements, as well as the reported 
amounts of revenue and expenses during the periods presented. We base our estimates, assumptions and judgments on historical experience 
and on various other factors that are believed to be reasonable under the circumstances. To the extent there are material differences between 
these estimates and actual results, our financial statements will be affected. We evaluate our estimates, assumptions and judgments on an 
ongoing basis.

We believe the following critical accounting policies affect our more significant judgments and estimates used in the preparation of our 

financial statements.

Business Combination

We accounted for our business acquisitions under Accounting Standards Codification ("ASC") Topic 805, “Business Combinations." 
Under this guidance, all of the assets acquired and liabilities assumed are recognized at their fair value as of the acquisition date. The excess 
of the purchase price over the estimated fair values of the net tangible and intangible assets acquired is recorded as goodwill. If a business 
combination results in a bargain purchase for us, the economic gain resulting from the fair value received being greater than the purchase 
price is recorded as a gain included in other income (expense), net in the Consolidated Statements of Comprehensive Loss. Prior to 
recognizing the gain, we reassess whether we have correctly identified all of the assets acquired and liabilities assumed and recognize any 
additional assets or liabilities that result from that review. We also review the measurement procedures used in valuing the assets acquired and 
liabilities assumed.

While we use our best estimates and assumptions as a part of calculating the fair value at the acquisition date, our estimates are 
inherently uncertain and subject to refinement. These assumptions and estimates include a market participant’s use of the asset and an 
appropriate discount rate. Our estimates are based on historical experience and information obtained from the management of the acquired 
companies. Our significant assumptions and estimates can include, but are not limited to, the cash flows that an asset is expected to generate 
in the future, the appropriate weighted-average cost of capital, and the cost savings expected to be derived from acquiring an asset. These 
estimates are inherently uncertain and unpredictable. In addition, unanticipated events and circumstances may occur which may affect the 
accuracy or validity of such estimates. As a result, during the measurement period, which may be up to one year from the acquisition date, we 
may record adjustments retrospectively to the fair value of assets acquired and liabilities assumed, with the corresponding offset to goodwill 
as of the acquisition date, or other income or expense in the case of a bargain purchase for the period of the acquisition. Upon the conclusion 
of the measurement period or final determination of the fair value of assets acquired or liabilities assumed, whichever comes first, any 
subsequent adjustments are recorded to our Consolidated Statements of Comprehensive Loss.

Revenue Recognition

We derive revenue primarily from the sale of hardware products and related software. Revenue is recognized when all of the following 

criteria have been met:

•  Persuasive evidence of an arrangement exists.   We generally rely upon sales agreements and customer purchase orders as evidence 

of an arrangement.

•  Delivery has occurred.  We use the shipping terms of the arrangement or evidence of customer acceptance to verify delivery or 

performance.

•  Sales price is fixed or determinable.   We assess whether the sales price is fixed or determinable based on the payment terms and 
whether the sales price is subject to refund or adjustment.  Payment terms to customers can range from net 30 to net 120 days.

•  Collectability is reasonably assured.  We assess collectability based primarily on creditworthiness of customers and their payment 

histories.

Revenue from installation and training services are recognized as the services are completed. Post-sales software support revenue and 

extended warranty services revenue are deferred and recognized ratably over the period during which the services are to be performed. To 
date, service revenue has comprised an insignificant portion of our revenue and we have not reported service revenue separately from product 
revenue in our financial statements. In instances where substantive acceptance provisions are specified in the customer agreement, revenue is 
deferred until all acceptance criteria have been met. From time to time, we offer customers sales incentives, which include volume rebates 
and discounts. These amounts are estimated on a quarterly basis and recorded net of revenue.

We enter into arrangements with certain of our customers who receive government supported loans and grants from the RUS to finance 
capital spending. Under the terms of an RUS equipment contract that includes installation services, the customer does not take possession and 
control and title does not pass until formal acceptance is obtained from the customer. Under this type of arrangement, we do not recognize 
revenue until we have received formal acceptance from the customer. For RUS arrangements that do not involve installation services, we 
recognize revenue in accordance with the revenue recognition policy described above.

Our products contain both software and non-software components that function together to deliver the products' essential functionality. 

When we enter into sales arrangements that consist of multiple deliverables of our product and service offerings, we allocate the total 

41

consideration of the arrangement to each separable deliverable based on their relative selling price. We limit the amount allocable to delivered 
elements to the amount that is not contingent upon the delivery of additional items or meeting specified performance conditions, and 
recognize revenue on each deliverable in accordance with our revenue policy. The determination of selling price for each deliverable is based 
on a selling price hierarchy, which is vendor-specific objective evidence (“VSOE”) if available, third-party evidence (“TPE”) if VSOE is not 
available, or estimated selling price (“ESP”) if neither VSOE nor TPE is available. VSOE of selling price is based on the price charged when 
the element is sold separately. In determining VSOE, we require that a substantial majority of the selling prices of an element fall within a 
narrow range when each element is sold separately. We have established VSOE for our training and post-sales software support services 
based on the normal pricing practices of these services when sold separately. TPE of selling price is established by evaluating whether there 
are similar competitor products or services that are sold in stand-alone sales transaction to similarly situated customers. Generally, our 
marketing strategy differs from that of our peers and our offerings contain a significant level of customization and differentiation such that the 
comparable pricing of products with similar functionality cannot be obtained. Additionally, as we are unable to reliably determine what 
similar competitor products' selling prices are on a stand-alone basis, we are not typically able to determine TPE. ESP is established 
considering multiple factors including, but not limited to geographies market conditions, competitive landscape, internal costs, gross margin 
objectives, characteristics of targeted customers and pricing practices. The determination of ESP is made through consultation with and 
formal approval by management, taking into consideration the go-to-market strategy. 

Stock-Based Compensation

In accordance with ASC Topic 718, "Compensation - Stock Compensation," stock-based awards are recorded at fair value as of the 

grant date and recognized to expense over the employee’s requisite service period (generally the vesting period), which we have elected to 
amortize on a straight-line basis. 

We value restricted stock units ("RSUs") and restricted stock awards ("RSAs") at the closing market price of our common stock on the 
date of grant. The fair value of performance restricted stock units ("PRSUs") with a market condition is estimated on the date of grant, using a 
Monte Carlo simulation model to estimate the total return ranking of our common stock in relation to the peer group over each performance 
period. Compensation cost on PRSUs with a market condition is not adjusted for subsequent changes in the Company's stock performance or 
the level of ultimate vesting.

We estimate the fair value of stock options and employee stock purchase rights at the grant date using the Black-Scholes option-pricing 

model. This model requires the use of highly judgmental assumptions, including expected stock price volatility and expected life of option 
awards, which have a significant impact on the fair value estimates and are discussed in detail in Note 8, "Stockholders' Equity" of the Notes 
to Consolidated Financial Statements in this Form 10-K. Changes to these estimates will cause the fair values of our stock options and related 
stock-based compensation expense that we record to vary.

In addition, we apply an estimated forfeiture rate to awards granted and record stock-based compensation expense only for those 

awards that are expected to vest. Forfeiture rates are estimated at the time of grant based on our historical experience. Further, to the extent 
our actual forfeiture rate is different from our estimate, stock-based compensation is adjusted accordingly.

Inventory Valuation

Inventory consisting of finished goods purchased from contract manufacturers is stated at the lower of cost, determined by the first-in, 

first-out method, or market value. We regularly monitor inventory quantities on-hand and record write-downs for excess and obsolete 
inventories based on our estimate of demand for our products, potential obsolescence of technology, product life cycle and whether pricing 
trends or forecasts indicate that the carrying value of inventory exceeds our estimated selling price. These factors are impacted by market and 
economic conditions, technology changes and new product introductions and require estimates that may include elements that are uncertain. 
Actual demand may differ from forecasted demand and may have a material effect on gross margins. If inventory is written down, a new cost 
basis is established that cannot be increased in future periods. The sale of previously reserved inventory has not had a material impact on our 
gross margins.

Allowance for Doubtful Accounts

We maintain an allowance for doubtful accounts for estimated losses resulting from the inability or unwillingness of our customers to 

make required payments. We record a specific allowance based on an analysis of individual past-due balances. Additionally, based on 
historical write-offs and our collection experience, we record an additional allowance based on a percentage of outstanding receivables. We 
perform credit evaluations of our customers’ financial condition. These evaluations require significant judgment and are based on a variety of 
factors including, but not limited to, current economic trends, payment history and a financial review of the customer.

Warranty

We offer limited warranties for our hardware products for a period of one or five years, depending on the product type. We recognize 

estimated costs related to warranty activities as a component of cost of revenue upon product shipment. The estimates are based on historical 
product failure rates and historical costs incurred in correcting product failures. The recorded amount is adjusted from time to time for 
specifically identified warranty exposure. Actual warranty expenses are charged against our estimated warranty liability when incurred. 
Factors that affect our warranty liability include the number of installed units and historical and anticipated rates of warranty claims and cost 
per claim.

Valuation of Goodwill and Intangible Assets

Goodwill is not amortized but instead is subject to an annual impairment test or more frequently if events or changes in circumstances 
indicate that it may be impaired. We evaluate goodwill on an annual basis as of the end of the second quarter of each year. Management has 

42

determined that we operate as a single reporting unit and, therefore, evaluates goodwill impairment at the enterprise level. Intangible assets 
are reviewed for impairment whenever events or changes in circumstances indicate an asset’s carrying value may not be recoverable.

To evaluate for impairment, we compare the Company's fair value to its carrying value including goodwill. We determine the 
Company's fair value using both an income approach and a market approach. Under the income approach, we determine the fair value based 
on estimated future cash flows, discounted by an estimated weighted-average cost of capital, which reflects the overall level of inherent risk 
of the Company and the rate of return an outside investor would expect to earn. Under the market-based approach, we utilize information 
regarding the Company as well as publicly available industry information to determine earnings multiples that are used to value the 
Company. If the carrying value of the Company exceeds its fair value, we will test to determine the amount of impairment loss by comparing 
the implied fair value of goodwill with the carrying value of goodwill. An impairment charge is recognized for the excess of the carrying 
value of goodwill over its implied fair value.

We completed the annual goodwill impairment test as of June 30, 2012 in July 2012 and determined that the fair value of our reporting 
unit exceeded the carrying value by approximately 15%. See Note 3, “Goodwill and Intangible Assets” for a detailed discussion. There have 
been no significant events or circumstances affecting the valuation of goodwill subsequent to the annual impairment test performed in July 
2012. As of December 31, 2012, there was no impairment to the carrying value of our goodwill. In addition, there were no impairment losses 
for goodwill during 2011 and 2010.

Intangible assets with finite useful lives are amortized over their estimated useful life, generally 5 years. We periodically evaluate 
intangible assets for impairment whenever events or changes in circumstances indicate that a potential impairment may have occurred. If such 
events or changes in circumstances arise, we compare the carrying amount of the intangible assets to the estimated future undiscounted cash 
flows expected to be generated by the assets. If the estimated aggregate undiscounted cash flows are less than the carrying amount of the 
intangible assets, an impairment charge, calculated as the amount by which the carrying amount of the assets exceeds the fair value of the 
assets, is recorded. The fair value of intangible assets is determined based on the estimated discounted cash flows expected to be generated 
from the assets. We have reviewed events and changes to our business during the year and have determined that there was no impairment to 
our intangible assets during 2012. We did not incur any impairment losses for intangible assets during 2011 and 2010.

Income Taxes

We evaluate our tax positions and estimate our current tax exposure in each jurisdiction in which we operate.  This includes assessing 

the temporary differences resulting from differing treatment of items not currently deductible for tax purposes. These differences result in 
deferred tax assets and liabilities on our consolidated balance sheets, which are calculated based upon the difference between the financial 
statement and tax bases of assets and liabilities using the enacted tax rates that will be in effect when these differences reverse. In general, 
deferred tax assets represent future tax benefits to be received when certain expenses previously recognized in our statements of operations 
become deductible expenses under applicable income tax laws or loss or credit carry-forwards are utilized. Since realization of our deferred 
tax assets is dependent on future taxable income against which these deductions, losses and credits can be utilized, we must assess the 
likelihood that our deferred tax assets will be recovered from future taxable income. To the extent we believe that recovery is below the more 
likely than not threshold, we must establish a valuation allowance against the net deferred tax asset.  Significant judgment is required in 
determining our provision for income taxes, our deferred tax assets and liabilities and any valuation allowance recorded against net deferred 
tax assets.  

Since inception, we have incurred operating losses and accordingly have federal and state net operating loss carry-forwards of $554.7 

million and $318.7 million. The U.S. federal net operating loss carryforwards will expire at various dates beginning in 2018 and through 2032 
if not utilized. The state net operating loss carryforwards will expire at various dates beginning in 2013 and through 2032, if not utilized. 
Additionally, we have U.S. federal and state research and development credits of $15.9 million and $22.0 million as of December 31, 2012. 
The credits have varying expiration dates between 2015 and 2032 with California credits having no expiration. These two items account for 
the bulk of our net deferred tax asset of $207.5 million as of December 31, 2012. Excluding our foreign operations, we have recorded a full 
valuation allowance against the net deferred assets at each balance sheet date presented. We believe that based on the available evidence and 
history of operating losses, it is more likely than not that we will not be able to utilize all of our deferred tax assets before expiration. We 
intend to maintain the full valuation allowances until sufficient evidence exists to support the reversal of the valuation allowances.

Results of Operations for Years Ended December 31, 2012, 2011 and 2010 

Revenue

The following table sets forth our revenue (in thousands, except for percentages):

Years Ended December 31,

2012 vs 2011 Change

2011 vs 2010 Change

2012

2011

2010

$

%

$

%

Revenue

$

330,218

$

344,669

$

287,043

$ (14,451)

(4)% $ 57,626

20%

Our revenue is principally derived in the United States. During 2012, 2011, and 2010, revenue generated in the United States 

represented approximately 93%, 94% and 85%, respectively. 

2012 compared to 2011: Revenue decreased in 2012 compared with 2011 by $14.5 million, or 4%, primarily due to a decrease in shipment 
volume during the first half of the year resulting from the softness in demand across multiple customer markets which we believe was due to 
a slowdown in capital expenditures by service providers increasingly concerned about macro-economic conditions and uncertainties 

43

associated with the implementation of regulatory reforms. In the first half of 2012, revenue decreased by $11.9 million as compared to the 
same period of 2011. These issues began to subside in the second half of 2012 and our shipment volume and revenue increased accordingly.

2011 compared to 2010: Revenue increased by $57.6 million from $287.0 million in 2010 to $344.7 million in 2011 primarily due to an 
increase in our customer base as a result of the Occam acquisition. Our revenue in the second half of the fiscal 2011 was impacted by a 
slowdown in business primarily related to continued delays in Broadband Stimulus awards under the American Recovery and Reinvestment 
Act of 2009 becoming shippable orders due to challenges that a number of our awarded customers are facing in navigating some of the 
bureaucratic hurdles of the program. Other factors that contributed to this slowdown include reduced investment in the traditional networks at 
one of our major customers, the competitive environment, weak macro-economic conditions and fiber shortages in certain portions of the 
market caused by the tsunami in Northern Japan. 

Cost of Revenue and Gross Profit

Our cost of revenue is comprised of the following: 

•  Products and services revenue—Cost of products revenue includes the inventory costs of our products that have shipped, accrued 
warranty costs for our standard warranty program, outbound freight costs to deliver products to our customers, overhead from our 
manufacturing operations cost centers, including stock-based compensation, and other manufacturing related costs associated with 
manufacturing our products and managing our inventory. We outsource our manufacturing to third-party manufacturers. Inventory 
costs are estimated using standard costs, which reflect the cost of historical direct labor, direct overhead and materials used to 
build our inventory. Cost of services revenue includes direct installation material costs, direct costs from third-party installers, 
professional service costs, repair fees charged by our outsourced repair contractors to refurbish product returns under an extended 
warranty or per incident repair agreement, and other miscellaneous costs to support our services.

•  Acquisition-related expenses—Acquisition-related expenses are primarily related to inventory acquired from Occam that was 

revalued to its estimated fair value and was amortized to cost of revenue as the inventory was sold. We amortized $14.2 million 
related to the revaluation of inventory during 2011. Additionally, we incurred charges of $5.6 million during 2011 for excess and 
obsolete inventory resulting from the Occam acquisition.

•  Amortization of acquired intangible assets—In connection with the acquisitions of Occam in 2011 and OSI in 2006, we recorded 

amortizable intangible assets of $30.3 million and $28.9 million respectively, which included core developed technologies, 
purchase order backlog and the trade name. These amounts are amortized to cost of revenue over their estimated useful lives. The 
intangible assets resulting from our acquisition of OSI had been fully amortized during the first quarter of 2011. In addition, we 
acquired $16.3 million in-process technology from Occam. At the end of the first quarter of 2012, upon the completion of the 
research and development efforts associated with this in-process technology, we determined that this technology had a useful life 
of 5 years and therefore reclassified it as core developed technology and began amortizing this intangible asset to cost of revenue 
during the second quarter of 2012. 

The following table sets forth our cost of revenue (in thousands, except for percentages):

Years Ended December 31,

2012 vs 2011 Change

2011 vs 2010 Change

2012

2011

2010

$

%

$

%

Cost of revenue:

Products and services
Acquisition-related expenses
Amortization of intangible assets

Total cost of revenue
Gross profit
Gross margin

$ 185,103
—
7,539
$ 192,642
$ 137,576

$ 195,698
19,966
9,552
$ 225,216
$ 119,453

$ 168,873
—
5,440
$ 174,313
$ 112,730

42%

35%

39%

$

$
$

(10,595)
(19,966)
(2,013)
(32,574)
18,123

(5)% $

(100)%
(21)%
(14)% $
15 % $

26,825
19,966
4,112
50,903
6,723

16%
100%
76%
29%
6%

2012 compared to 2011: Cost of revenue decreased in 2012 compared with 2011 by $32.6 million, or 14%, which is due to the fact that we 
did not incur any associated acquisition-related expenses subsequent to 2011, a decrease in cost of products and service revenues, and a 
decrease in amortization of intangible assets. The decrease in cost of products and service revenues was a result of decreased revenue, 
increased order volumes, and decreased write-down charges for excess and obsolete inventory as a result of improved inventory management

The decrease in amortization of intangible assets in 2012 is primarily attributable to the completion of the amortization of certain 
intangibles in 2011 that we acquired from Occam and OSI, offset in part by the amortization of the core developed technology that was 
reclassified from in-process technology in the first quarter of 2012 as discussed above. 

Gross margin increased in 2012 compared with 2011, primarily due to the absence of acquisition-related expenses, lower excess and 

obsolete inventory write-down charges, and lower intangible assets amortization expenses. Excluding acquisition-related expenses and 
intangible asset amortization, gross margin increased during 2012 to 44% from 43% in 2011, primarily due to a combination of product mix 
and cost reductions. In 2012, we shipped more higher margin E-Series platforms as compared to 2011.

2011 compared to 2010: Cost of revenue increased from $174.3 million to $225.2 million for the fiscal 2011 compared with the 
corresponding periods of fiscal 2010, primarily due to an increase in revenues recognized during this period, acquisition-related expenses and 
the amortization of acquired intangible assets. In addition we experienced a significant increase in the excess and obsolete inventory write-
downs in the third quarter of fiscal 2011 primarily due to end of life inventory and excess parts held by us and our contract manufacturer.

44

Gross margin decreased during 2011, primarily due to higher acquisition-related expenses and intangible asset amortization when 
compared to the corresponding period of fiscal 2010. During fiscal 2011, gross margin decreased primarily due to the acquisition-related 
expenses primarily related to revaluation of inventory acquired in our acquisition of Occam. Excluding acquisition-related expenses and 
intangible asset amortization, gross margin increased during 2011 to 43% from 41% in 2010, primarily due to cost reductions, change in 
product mix, and within product mix the introduction of many new products in 2010.

Operating Expenses

Research and Development Expenses

Research and development expenses represent the largest component of our operating expenses and include personnel costs, consulting 

services, depreciation on lab equipment, costs of prototypes and overhead allocations. We generally expense research and development costs 
as incurred, since the costs of software development that we incur after a product has reached technological feasibility are not material. The 
following table sets forth our research and development expenses (in thousands, except for percentages):

Research and development
Percent of total revenue

Years Ended December 31,

2012 vs 2011 Change

2011 vs 2010 Change

2012

2011

2010

$

%

$

$

66,748

$

67,725

$

55,412

$

(977)

(1)% $

12,313

%
22%

20%

20%

19%

2012 compared to 2011: Research and development expenses decreased in 2012 compared with 2011 by $1.0 million, or 1%, primarily due 
to a decrease in prototype expenses resulting from the timing of new product development activities, and a decrease in stock-based 
compensation expense resulting from RSUs granted in a company-wide stock option exchange program, which were fully vested by May 
2011. These decreases were offset in part by an increase in compensation expenses due to increased headcount resulting from the acquisition 
of Ericsson's fiber access assets on November 2, 2012 and the expansion of our China development center.

In connection with our EFAA acquisition that was completed in November 2012, we anticipate that we will incur increased 

compensation costs within research and development due to additional headcount and increased facility related costs associated with our new 
San Jose facility. To mitigate this increase in facility expenses, we are actively seeking to sublease our Fremont facility that is estimated to be 
vacated in March 2013. We are continuing our strategic investments in our Unified Access portfolio. We intend to continue to dedicate 
significant resources to research and development and to develop new product capabilities to support the performance, scalability and 
management of our Unified Access portfolio. 

2011 compared to 2010: Research and development expenses increased $12.3 million from $55.4 million for 2010 to $67.7 million for 2011, 
primarily due to an increase in compensation and related costs, including travel-related expenses, from an increase in headcount, and an 
increase in depreciation and facilities-related expenses resulting from the acquisition of Occam and the expansion of our China development 
center. In addition we also experienced an increase in prototype and consulting expenses related to new product development and our pursuit 
of OSMINE certification. This increase was partially offset by a decrease in stock-based compensation expense resulting from RSUs granted 
in a company-wide stock option exchange program, which began amortizing at the date of our IPO on March 24, 2010, and were fully vested 
and related stock-based compensation expense recognized by May 2011.

Sales and Marketing Expenses

Sales and marketing expenses consist of personnel costs, employee sales commissions and marketing programs. The following table 

sets forth our sales and marketing expenses (in thousands, except for percentages):

Sales and marketing

Percent of total revenue

Years Ended December 31,

2012 vs 2011 Change

2011 vs 2010 Change

2012

2011

2010

$

%

$

$

62,129

$

55,551

$

42,121

$

6,578

12% $

13,430

%
32%

19%

16%

15%

2012 compared to 2011: Sales and marketing expenses increased in 2012 compared with 2011 by $6.6 million, or 12%, primarily due to an 
increase in compensation and related costs, an increase in stock-based compensation expense, which were primarily driven by an increase in 
headcount in order to expand our international sales operations.

We will continue our investments in sales and marketing in order to extend our market reach and grow our business in support of our 

key strategic initiatives. 

2011 compared to 2010: Sales and marketing expenses increased $13.5 million from $42.1 million for 2010 to $55.6 million for 2011, 
primarily due to an increase in compensation and related expenses, including commission and travel-related expenses, from an increase in 
headcount, and an increase in depreciation and facilities-related expenses resulting from our acquisition of Occam, partially offset by a 
decrease in corporate bonus plan expense. In addition we experienced an increase in consulting expenses and an increase in marketing 
expenses mostly related to increased attendance at our User Group and Telco TV events that occurred in the fourth quarter of 2011.

45

General and Administrative Expenses

General and administrative expenses consist primarily of personnel costs and costs for facilities related to our executive, finance, 

human resource, information technology and legal organizations and fees for professional services. Professional services consist of outside 
legal, tax, and audit services. The following table sets forth our general and administrative expenses (in thousands, except for percentages):

General and administrative
Percent of total revenue

Years Ended December 31,

2012 vs 2011 Change

2011 vs 2010 Change

2012

2011

2010

$

%

$

$

26,114

$

27,002

$

27,998

$

(888)

(3)% $

(996)

%
(4)%

8%

8%

10%

2012 compared to 2011: General and administrative expenses decreased in 2012 compared with 2011 by $0.9 million, or 3%, primarily due 
to a decrease in stock-based compensation expense resulting from RSUs granted in a company-wide stock option exchange program, which 
were fully vested by May 2011. These decreases were offset in part by increases in professional service expenses as well as an increase in 
compensation and related expenses due to increased headcount. 

2011 compared to 2010: General and administrative expenses decreased $1.0 million from $28.0 million for 2010 to $27.0 million for 2011. 
The decrease was primarily due to a decrease in stock-based compensation expense resulting from RSUs granted in a company-wide stock 
option exchange program, which began vesting at the date of our IPO on March 24, 2010 and were fully vested in May 2011 and a decrease 
in corporate bonus plan expense. This decrease was partially offset by an increase in compensation and related costs from increased 
headcount and facilities-related and depreciation expenses due to the Occam acquisition and a severance payment made to our former chief 
financial officer in the first quarter of fiscal 2011.

Acquisition-related Expenses

We expense all acquisition-related costs as incurred. These costs generally include outside services for legal and accounting fees, costs 
associated with consolidating facilities, severance and retention bonuses paid to transitional and certain other employees, and costs for other 
integration services. The following table sets forth our acquisition-related expenses included in operating expenses (in thousands, except for 
percentages):

Acquisition-related expenses
Percent of total revenue

Years Ended December 31,

2012 vs 2011 Change

2011 vs 2010 Change

2012

2011

2010

$

%

$

$

1,401

$

12,927

$

3,942

$ (11,526)

(89)% $

8,985

%
228%

—%

4%

1%

2012 compared to 2011: Acquisition-related expenses for 2012 and 2011 were related to our EFAA acquisition and our Occam acquisition, 
respectively. The decrease is primarily due to the magnitude and complexity of the Occam acquisition compared to the EFAA acquisition. For 
the Occam acquisition, we incurred significant expenses associated with legal and professional fees, consolidating facilities, severance 
payments, salaries paid to transitional Occam employees, and stock-based compensation related to accelerated vesting for certain Occam 
executives who terminated subsequent to the acquisition date. For the EFAA acquisition, the vast majority of the $1.4 million acquisition-
related expense consisted of one-time payments made to former Ericsson employees who transferred to Calix as a result of the acquisition. 
We do not expect any additional acquisition-related expenses going forward for the EFAA acquisition.

2011 compared to 2010: The increase in acquisition-related expenses from 2010 to 2011 was due to that we completed the Occam acquisition 
in 2011 but did not complete any acquisition in 2010. The expenses incurred in 2010 consisted of legal and professional expenses in 
connection with our effort to acquire Occam.  

For more information regarding the aforementioned acquisitions, see Note 2, “Business Combinations” of the Notes to Consolidated 

Financial Statements included in this Form 10-K.

Amortization of Intangible Assets

In connection with our acquisitions of Occam in 2011 and OSI in 2006, we recorded amortizable intangible assets related to customer 
relationships of $51.0 million and $3.7 million, respectively. These amounts are amortized to operating expenses over their estimated useful 
lives. The amortization of intangible assets related to OSI acquisition was completed during the first quarter of 2011. The following table sets 
forth our amortization of intangible assets expenses included in operating expenses (in thousands, except for percentages):

Amortization of intangible assets

$ 10,208

$

8,569

$

Percent of total revenue

3%

2%

740
—%

$

1,639

19% $

7,829

2012

2011

2010

$

%

$

%
1,05
8

%

Years Ended December 31,

2012 vs 2011 Change

2011 vs 2010 Change

2012 compared to 2011: Amortization of intangible assets was greater during 2012 due to twelve months of amortization in 2012 compared 
with ten months of amortization in 2011, as the Occam acquisition was completed on February 22, 2011.

2011 compared to 2010: We recorded amortization expense of $8.6 million for the fiscal year ended December 31, 2011 and $0.7 million for 
the year ended 2010. The amortization of intangible assets related to our acquisition of OSI was completed during the first quarter of 2011. 

46

The amortization of the intangible assets related to Occam began at the end of February of 2011 and will amortize over their estimated useful 
lives.

Interest and Other Income (Expense), net

The following table sets forth our interest and other income (expense), net (in thousands, except for percentages):

Years Ended December 31,

2012 vs 2011 Change

2011 vs 2010 Change

2012

2011

2010

$

%

$

%

Interest and other income (expense), net

Interest income
Interest expense
Gain on bargain purchase
Change in fair value of preferred stock
warrants
Other income (expense), net

Total interest and other income (expense), net

$

Percent of total revenue

$

15
(185)
1,029

—
(3)
856
—%

$

$

87
(184)
—

—
92
(5)
— %

$ 384
(1,188)
—

(173)
(12)
$ (989)

— %

$

(72)
(1)
1,029

—
(95)
861

$

(83)% $ (297)
1,004
—

1 %
100 %

— %
(103)%
(17,220)% $

173
104
984

(77)%
(85)%
— %

(100)%
(867)%
(99)%

2012 compared to 2011: Interest and other income (expense), net, increased by $0.9 million during 2012 from a net expense of $5 thousand 
for 2011 to a net income of $0.9 million for 2012. This increase was primarily due to a gain on bargain purchase related to the EFAA 
acquisition. See Note 2, "Business Combinations" of the Notes to the Consolidated Financial Statements in this Form 10-K for more details. 
The EFAA acquisition resulted in a bargain purchase as Ericsson had been incurring losses in its fiber access business at the time of the 
acquisition and was therefore motivated to sell the assets of its fiber access assets.

2011 compared to 2010: Interest and other income (expense), net, was a net expense of $1.0 million for 2010 compared to a net expense of 
$5 thousand for 2011. The decrease in the net expense during fiscal 2011, when compared to the corresponding period of 2010 was primarily 
due to a decrease in interest expense resulting from the repayment of our outstanding loan of $20.0 million on May 4, 2010. This decrease 
was partially offset by a decrease in other income resulting from lower cash and investment balances during 2011 compared to 2010.

Liquidity and Capital Resources

We have funded our operations primarily through cash generated from operations and the 2010 initial public offering of our common 

stock. At December 31, 2012, we had cash and cash equivalents of $47.0 million, which consisted of deposits held at banks and money 
market mutual funds held at major financial institutions. We also have a revolving credit facility of $30.0 million based upon a percentage of 
eligible accounts receivable. Included in the revolving line are amounts available under letters of credit and cash management services. We 
are required to pay commitment fees of 0.25% per year on any unused portions of the facility. Any outstanding borrowings under our 
revolving credit facility bear a variable rate of interest based upon the applicable LIBOR or PRIME rate, which is adjusted based on our 
leverage ratio. The revolving credit facility matures on June 30, 2013. We intend to obtain a similar revolving credit facility after the current 
one expires.

The following table presents the cash inflows and outflows by activity during 2012, 2011, and 2010 (in thousands):

Net cash provided by operating activities
Net cash used in investing activities
Net cash provided by (used in) financing activities

Operating Activities

Years Ended December 31,

2012

2011

2010

$

$

27,678
(22,179)
2,513

$

14,589
(36,409)
(5,634)

9,176
(2,288)
27,595

Our operating activities provided cash of $27.7 million in 2012 and $14.6 million in 2011. The increase in cash provided by operating 
activities during 2012 as compared to 2011 was due primarily to a favorable change of $16.8 million in our operating results after adjustment 
of non-cash charges, offset partially by a $3.7 million decrease in net cash inflow resulting from changes in operating assets and liabilities.

In 2012, non-cash charges were $43.0 million (the majority of which consist of depreciation and amortization expenses and stock-

based compensation expense). Cash inflows from changes in operating assets and liabilities primarily resulted from a $26.4 million increase 
in deferred revenue as a result of increased shipments relating to certain RUS-funded contracts, an $11.3 million decrease in inventory due to 
improved inventory management, and a $2.6 million increase in accounts payable due to the timing of inventory receipts and payments. Cash 
outflows from changes in operating assets and liabilities included primarily a $13.4 million increase in deferred cost of revenue primarily 
related to the deferral of certain RUS-funded contracts, a $13.0 million increase in net accounts receivable due to the timing of sale and 
billing activities, and a $0.9 million decrease in accrued liabilities.

In 2011, our operating activities provided cash of $14.6 million. This resulted primarily from non-cash charges of $50.4 million (the 

majority of which consist of stock-based compensation expense, amortization of intangible assets, and depreciation expense) and positive net 
changes in operating assets and liabilities, largely offset by our net loss of $52.6 million. Cash inflows from changes in operating assets and 
liabilities included primarily a net decrease of $13.7 million in accounts receivable due to strong cash collections, $8.6 million related to the 

47

sell through of inventory, an increase in deferred revenue of $2.8 million due to the deferral of certain RUS funded contracts and $0.3 million 
release of restricted cash. These inflows were partially offset by cash outflows from accounts payable of $7.8 million resulting primarily from 
payments of accounts payable assumed from Occam and a decrease of $0.7 million in accrued and other liabilities.

In 2010, our operating activities provided $9.2 million in cash, which consisted of our net loss of $18.6 million offset by non-cash 
charges of $38.0 million. In addition, cash outflows from changes in operating assets and liabilities included a decrease in deferred revenue of 
$11.4 million primarily from the recognition of revenue from one large customer order that had been booked in 2008 and lower overall 
revenue deferrals from adoption of new accounting rules at the beginning of 2010 offset by an increase in extended warranty revenue 
deferrals, an increase in inventories of $6.0 million to support higher business volumes with a wider product mix and in additional receipts of 
last time buys of component inventory that have been discontinued by suppliers, a decrease in accounts payable of $4.4 million as we 
decreased inventory receipts in the last month of the 2010, and a decrease in accrued liabilities of $2.6 million primarily related to the 
utilization of customer rebate balances offset by an increase in accrued compensation related to an increase in the corporate bonus plan and 
vacation balances from significant increases in employee headcount. Cash inflows from changes in operating assets and liabilities included a 
decrease in deferred cost of goods sold of $8.7 million related to the decrease in deferred revenue, a decrease in accounts receivable of $3.6 
million due to strong collections, and a decrease in prepaid assets primarily due to IPO related costs reclassed to equity on the close of our 
initial public offering.

Investing Activities

In 2012, our cash used in investing activities primarily consisted of cash payment of $12.0 million to complete the acquisition of 

Ericsson's fiber access assets, and capital expenditures of $10.2 million primarily as a result of purchases of computer equipment and 
software.

In 2011, our cash used in investing activities primarily consisted of our acquisition of Occam for $60.8 million, net of $33.6 million of 

Occam cash assumed in the transaction, and capital expenditures of $7.4 million, partially offset by maturities of marketable securities of 
$31.8 million.

In 2010, our cash used in investing activities consisted of capital expenditures of $5.6 million, which primarily consisted of computer 

and test equipment, and the purchase of marketable securities of $79.2 million partially offset by sales and maturities of marketable securities 
of $82.5 million.

Financing Activities

In 2012, our financing activities provided cash of $2.5 million, which consisted of proceeds of $4.1 million from the issuance of 
common stock under the employee stock purchase plan (“ESPP”) and proceeds of $0.2 million from the exercises of stock options, offset by 
$1.7 million payment of payroll taxes for the vesting of restricted stock units and restricted stock awards. 

In 2011, our cash used in financing activities of $5.6 million primarily consisted of payment of payroll taxes of $10.4 million for the 
vesting of restricted stock units, offset by proceeds of $3.9 million from the issuance of common stock under the employee stock purchase 
plan or “ESPP” and proceeds of $0.8 million from the exercise of stock options. The payroll taxes withholding of $10.4 million for the 
vesting of the RSUs were net share-settled to cover the required withholding tax and the remaining amount was converted into an equivalent 
number of shares of common stock. The total shares withheld were approximately 485,000, which was based on the value of the RSUs on 
their vesting date as determined by our closing stock price.

In 2010, our financing activities provided cash of $27.6 million, which primarily consisted of net proceeds of $57.3 million from our 

IPO partially offset by the repayment of a term loan of $20.0 million. On May 4, 2010, we paid the outstanding loan payable to SVB of $20.0 
million in its entirety including outstanding accrued interest and prepayment penalties of $0.4 million. Additionally, we paid payroll taxes of 
$7.8 million for the vesting of 50% of the restricted stock units or RSUs, that had been exchanged for stock options held by employees in 
2009 and $2.2 million for other RSUs that vested during the year ended 2010. Upon vesting, the RSUs were net share-settled to cover the 
required withholding tax and the remaining amount was converted into an equivalent number of shares of common stock. The total shares 
withheld were approximately 737,000, which was based on the value of the RSUs on their vesting date as determined by our closing stock 
price.

Working Capital and Capital Expenditure Needs

Except as disclosed in the Contractual Obligations and Commitments section below, we currently have no material cash commitments, 

except for normal recurring trade payables, expense accruals, operating leases and firm purchase commitments. In addition, we believe that 
our outsourced approach to manufacturing provides us significant flexibility in both managing inventory levels and financing our inventory. 
We may be required to issue performance bonds to satisfy requirements under our RUS-funded contracts. We issue letters of credit under our 
existing credit facility to support a portion of these performance bonds. In the event we do not have sufficient capacity under our credit 
facility to support these bonds, we will have to purchase certificates of deposit, which could materially impact our working capital or limit 
our ability to satisfy such contract requirements.  As of December 31, 2012, we had outstanding letters of credit totaling $3.3 million and 
there was approximately $26.7 million available for borrowing under our revolving credit facility. At December 31, 2011, we had cash of $0.8 
million restricted for the issuance of surety performance bonds we acquired through our acquisition of Occam. At December 31, 2012, there 
were no restrictions on our cash. In the event that our revenue plan does not meet our expectations, we may eliminate or curtail expenditures 
to mitigate the impact on our working capital.

We believe based on our current operating plan, our existing cash, cash equivalents and existing amounts available under our revolving 

line of credit will be sufficient to meet our anticipated cash needs for at least the next twelve months. Our future capital requirements will 
depend on many factors including our rate of revenue growth, the timing and extent of spending to support development efforts, the 

48

expansion of sales and marketing activities, the timing of introductions of new products and enhancements to existing products, the 
acquisition of new capabilities or technologies and the continued market acceptance of our products. In the event that additional financing is 
required from outside sources, we may not be able to raise it on terms acceptable to us or at all. If we are unable to raise additional capital 
when desired, our business, operating results and financial condition would be harmed.

Contractual Obligations and Commitments

Our principal commitments consist of obligations under operating leases for office space and non-cancelable outstanding purchase 

obligations. The following table summarizes our contractual obligations at December 31, 2012 (in thousands):

Operating lease obligations (1)
Non-cancelable purchase commitments (2)

Total

Payments Due by Period

Total

Less Than 1
year

1-3 Years

4-5 Years

More Than 5
years

$

$

10,598
10,318
20,916

$

$

4,255
10,318
14,573

$

$

3,914
—
3,914

$

$

1,869
—
1,869

$

$

560
—
560

(1) The total minimum payments under our operating lease obligations have not been reduced by minimum sublease rentals of 

$0.3 million due in the future under non-cancelable sublease of a portion of our office in Fremont, California.

(2) Represents outstanding non-cancelable purchase orders for finished goods to be delivered by our contract manufacturers.

Future minimum operating lease obligations in the table above include payments for our primary office space in Petaluma, California, 

and for our facilities in Minneapolis, Minnesota; Acton, Massachusetts; Nanjing, China; Richardson, Texas; and Fremont, San Jose, and Santa 
Barbara, California, which expire at various dates through 2018, and for certain office equipment under non-cancelable operating lease 
agreements, obtained through our acquisition of Occam, which expire at various dates through 2015. A portion of the office in Fremont, 
California is sublet under a sublease expiring in 2015. We are also actively seeking to sublease the remainder of our Fremont office that is 
estimated to be vacated in March 2013. A lease agreement for our office in San Jose, California, was entered into in November 2012, and 
expires in August 2018.

On January 28, 2013, the Company entered into an amendment to its lease agreement (the "Amendment") for its primary office space 
in Petaluma, California, to extend the lease term from February 2014 to February 2019 under a new base rent schedule effective February 1, 
2013. The total minimum future payment commitment under this Amendment is approximately $5.6 million and is not included in the table 
above.

Off-Balance Sheet Arrangements

As of December 31, 2012 and December 31, 2011, we did not have any off-balance sheet arrangements.

ITEM 7A. 

Quantitative and Qualitative Disclosures About Market Risk

Interest Rate Risk

The primary objectives of our investment activity are to preserve principal, provide liquidity and maximize income without 

significantly increasing risk. By policy, we do not enter into investments for trading or speculative purposes. At December 31, 2012, we had 
cash and cash equivalents of $47.0 million, which was held primarily in cash or money market funds. Due to the nature of these money 
market funds, we believe that we do not have any material exposure to changes in the fair value of our cash equivalents as a result of changes 
in interest rates.

Our exposure to interest rate risk also relates to the amount of interest we must pay on our outstanding debt instruments. Any 
outstanding borrowings under our revolving credit facility bear a variable rate of interest based upon the applicable LIBOR or PRIME rate, 
which is adjusted based on our leverage ratio. As of December 31, 2012, we had no outstanding borrowings under the revolving credit 
facility.

Foreign Currency Exchange Risk

In our view, our primary foreign currency exposures are economic, translation, and transaction.

Economic Exposure

The direct effect of foreign currency fluctuations on our sales and expenses have not been material because they are primarily 
denominated in U.S. dollars. However, we are indirectly exposed to changes in foreign currency exchange rates to the extent of our use of 
foreign contract manufacturers whom we pay in U.S. dollars. Changes in the local currency rates of these vendors in relation to the U.S. 
dollar could cause an increase in the price of products that we purchase. Additionally, if the U.S. dollar strengthens relative to other 
currencies, such strengthening could have an indirect effect on our sales to the extent it raises the cost of our products to non-U.S. customers 
and thereby reduces demand. A weaker U.S. dollar could have the opposite effect. The precise indirect effect of currency fluctuations is 
difficult to measure or predict because our sales are influenced by many factors in addition to the impact of such currency fluctuations.

49

Translation Exposure

Our sales contracts are primarily denominated in U.S. dollars and, therefore, the majority of our revenues are not subject to foreign 

currency risk. We are directly exposed to changes in foreign exchange rates to the extent such changes affect our expenses related to our 
foreign assets and liabilities with our subsidiary in China and the United Kingdom, whose functional currencies are the Chinese Renminbi  
and Great British pound sterling, respectively.

Our operating expenses are incurred primarily in the United States, with a small portion of expenses incurred in China associated with 

our research and development operations that are maintained there, and in the United Kingdom for our sales and services office there. Our 
operating expenses are generally denominated in the functional currencies of our subsidiaries in which the operations are located. For 2012, 
approximately 93% of our operating expenses were U.S.-dollar denominated, and 4% and 3% of our expenses were denominated in British 
pound and Chinese RMB, respectively. Assuming the same currency exchange rates as last year, the negative impact on our 2012 operating 
results was approximately $62 thousand. If the currencies noted above uniformly fluctuated by plus or minus 10% from the exchange rates as 
of December 31, 2012, the change in our results of operation for 2013 would be immaterial. We do not currently enter into forward exchange 
contracts to hedge exposure denominated in foreign currencies or any derivative financial instruments. In the future, we may consider 
entering into hedging transactions to help mitigate our foreign currency exchange risk.

Foreign exchange rate fluctuations may also adversely impact our financial position as the assets and liabilities of our foreign 
operations are translated into U.S. dollars in preparing our Consolidated Balance Sheets. The effect of foreign exchange rate fluctuations on 
our consolidated financial position for the year ended December 31, 2012 was a net translation gain of approximately $34 thousand. This gain 
is recognized as an adjustment to stockholders’ equity through accumulated other comprehensive income.

Transaction Exposure

We have certain assets and liabilities, primarily receivables and accounts payable (including inter-company transactions) that are 

denominated in currencies other than the relevant entity’s functional currency. In certain circumstances, changes in the functional currency 
value of these assets and liabilities create fluctuations in our reported consolidated financial position, cash flows and results of operations. 
Transaction gains and losses on these foreign currency denominated assets and liabilities are recognized each period within other income 
(expense), net in our Consolidated Statements of Comprehensive Loss. During the year ended December 31, 2012, net loss we recognized 
related to these foreign exchange assets and liabilities was approximately $21 thousand.

ITEM 8.   

Financial Statements and Supplementary Data.

Report of Independent Registered Public Accounting Firm

Consolidated Balance Sheets, As of December 31, 2012 and 2011

Consolidated Statements of Comprehensive Loss, Years Ended December 31, 2012, 2011 and 2010

Consolidated Statements of Convertible Preferred Stock and Stockholders’ Equity, Years Ended December 31, 2012, 
2011 and 2010

Consolidated Statements of Cash Flows, Years Ended December 31, 2012, 2011 and 2010

Notes to Consolidated Financial Statements

51

52

53

54

55

56

50

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Stockholders of Calix, Inc. and subsidiaries

We have audited the accompanying consolidated balance sheets of Calix, Inc. and subsidiaries (the Company) as of December 31,   

2012 and 2011, and the related consolidated statements of comprehensive loss, convertible preferred stock and stockholders' equity and cash 
flows for each of the three years in the period ended December 31, 2012. Our audits also included the financial statement schedule included 
in the index at Item 15(a).  These financial statements are the responsibility of the Company's management. Our responsibility is to express an 
opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those 

standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material 
misstatement.  An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An 
audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall 
financial statement presentation. We believe that our audits provide a reasonable basis for our opinion. 

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of 
Calix, Inc. and subsidiaries at December 31, 2012 and 2011, and the consolidated results of their operations and their cash flows for each of 
the three years in the period ended December 31, 2012, in conformity with U.S. generally accepted accounting principles. Also, in our 
opinion, the related financial statement schedule, when considered in relation to the basic financial statements taken as a whole, presents 
fairly in all material respects the information set forth therein.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), Calix, Inc. 
and subsidiaries' internal control over financial reporting as of December 31, 2012, based on criteria established in Internal Control-Integrated 
Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 21, 2013 
expressed an unqualified opinion thereon.

San Francisco, California
February 21, 2013 

/s/ ERNST & YOUNG LLP

51

CALIX, INC.

CONSOLIDATED BALANCE SHEETS
(In thousands, except share and per share data)

ASSETS

Current assets:

Cash and cash equivalents

Restricted cash

Accounts receivable, net

Inventory

Deferred cost of revenue

Prepaids and other current assets

Total current assets

Property and equipment, net

Goodwill

Intangible assets, net

Other assets

Total assets

LIABILITIES AND STOCKHOLDERS’ EQUITY

Current liabilities:

Accounts payable

Accrued liabilities

Deferred revenue

Total current liabilities

Long-term portion of deferred revenue

Other long-term liabilities

Total liabilities

Commitments and contingencies (See Note 5)

Stockholders’ equity:

December 31,
2012

December 31,
2011

$

46,995

$

—

59,519

43,282

21,077

5,677

176,550

21,083

116,175

62,301

1,788

38,938

754

46,508

45,229

7,698

4,429

143,556

16,130

116,175

80,048

2,194

$

$

377,897

$

358,103

$

16,804

36,176

39,315

92,295

15,782

745

108,822

14,250

36,214

15,347

65,811

13,347

1,528

80,686

Preferred stock, $0.025 par value; 5,000,000 shares authorized; no shares issued and outstanding
as of December 31, 2012 and December 31, 2011

—

—

Common stock, $0.025 par value; 100,000,000 shares authorized; 48,898,924 shares and
47,825,200 shares issued and outstanding as of December 31, 2012 and December 31, 2011,
respectively

Additional paid-in capital

Accumulated other comprehensive income

Accumulated deficit

Total stockholders’ equity

Total liabilities and stockholders’ equity

1,222

760,232

132

(492,511)

269,075

$

377,897

$

1,195

740,309

98

(464,185)

277,417

358,103

See accompanying notes to consolidated financial statements.

52

 
CALIX, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS
(In thousands, except per share data)

Revenue
Cost of revenue:

Products and services (1)
Acquisition-related expenses
Amortization of intangible assets
Total cost of revenue

Gross profit
Operating expenses:

Research and development (1)
Sales and marketing (1)
General and administrative (1)
Acquisition-related expenses (1)
Amortization of intangible assets
Total operating expenses

Loss from operations
Interest and other income (expense), net:

Interest income
Interest expense
Gain on bargain purchase
Change in fair value of preferred stock warrants
Other income (expense), net
Loss before provision for income taxes
Provision for income taxes
Net loss
Preferred stock dividends
Net loss attributable to common stockholders

Net loss per common share:
Basic and diluted
Weighted-average number of shares used to compute net loss per common share:
Basic and diluted

Other comprehensive income, net of tax:

Unrealized gain (loss) on investments, net
Foreign currency translation adjustments, net

Total other comprehensive income, net of tax

Comprehensive loss

 (1)  Includes stock-based compensation as follows:

Cost of revenue
Research and development
Sales and marketing
General and administrative
Acquisition-related expenses

Years Ended December 31,

2012
330,218

$

2011
344,669

$

2010
287,043

$

185,103
—
7,539
192,642
137,576

66,748
62,129
26,114
1,401
10,208
166,600
(29,024)

15
(185)
1,029
—
(3)
(28,168)
158
(28,326)
—
(28,326)

(0.59)

195,698
19,966
9,552
225,216
119,453

67,725
55,551
27,002
12,927
8,569
171,774
(52,321)

87
(184)
—
—
92
(52,326)
224
(52,550)
—
(52,550)

(1.15)

$

$

48,180

45,546

— $
34
34
(28,292)

$

(21)
88
67
(52,483)

1,433
4,227
5,160
6,617
—
17,437

$

$

1,503
4,828
4,500
9,538
1,234
21,603

$

$

$

$

$

$

168,873
—
5,440
174,313
112,730

55,412
42,121
27,998
3,942
740
130,213
(17,483)

384
(1,188)
—
(173)
(12)
(18,472)
81
(18,553)
900
(19,453)

(0.65)

29,778

38
10
48
(18,505)

1,745
5,966
4,555
13,309
—
25,575

$

$

$

$

$

$

See accompanying notes to consolidated financial statements.

53

 
 
                                                                                     
CALIX, INC.
CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY
(In thousands)

Convertible
Preferred Stock

Common Stock

Shares
22,492

Amount
$ 479,628

Shares
4,087

Amount
102
$

Additional
Paid-in
Capital
$ 52,739

54

900

—

—

—

(22,546)

(480,528)

28,115

703

480,192

Accumulated
Other
Comprehensive
Income (loss)

$

Accumulated
Deficit
(17) $ (392,182) $

Total
Stockholders’
Equity
(339,358)
(900)

Balance at December 31, 2009

Preferred stock dividend

Preferred stock and preferred stock warrant
conversion upon completion of the IPO
IPO proceeds, net of issuance costs and
underwriters’ discount
Stock-based compensation

Exercise of stock options and warrants

Issuance of vested restricted stock units, net of
taxes withheld
Net loss

Other comprehensive income
Balance at December 31, 2010

Stock-based compensation

Acquisition of Occam Networks

Exercise of stock options and warrants

Issuance of vested restricted stock units, net of
taxes withheld
Restricted stock awards issued

Stock issued under employee stock purchase plan

Net loss

Other comprehensive income
Balance at December 31, 2011

Stock-based compensation

Exercise of stock options

Issuance of vested restricted stock units, net of
taxes withheld
Stock issued under employee stock purchase plan

Shares withheld for taxes for vested restricted 
stock awards

Restricted stock awards forfeited

Net loss

Other comprehensive income
Balance at December 31, 2012

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

— $

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

5,116

—

164

1,230

—

—

38,712

—

6,359

207

1,703

423

421

—

—

128

—

4

31

—

—

968

—

159

5

42

11

10

—

—

57,184

25,575

284

(10,035)

—

—

605,939

21,603

118,469

799

(10,418)

(11)

3,928

—

—

47,825

1,195

740,309

—

115

400

619

(35)

(25)

—

—

—

3

10

16

(1)

(1)

—

—

17,437

191

(1,564)

4,047

(189)

1

—

—

—

—

—

—

—

—

—

48

31

—

—

—

—

—

—

—

67

98

—

—

—

—

—

34

(900)

—

—

—

—

—

(18,553)

—

(411,635)

—

—

—

—

—

—

(52,550)

—

(464,185)

—

—

—

—

(28,326)

—

480,895

57,312

25,575

288

(10,004)

(18,553)
48

195,303

21,603

118,628

804

(10,376)

—

3,938
(52,550)
67

277,417

17,437

194

(1,554)

4,063

(190)

—
(28,326)
34

48,899

$

1,222

$ 760,232

$

132

$ (492,511) $

269,075

See accompanying notes to consolidated financial statements.

54

CALIX, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
(In thousands)

Operating activities:

Net loss
Adjustments to reconcile net loss to net cash provided by operating activities:
Amortization of premiums relating to available-for-sale securities
Depreciation and amortization
Loss on retirement of property and equipment
Amortization of intangible assets
Revaluation of warrant liability
Stock-based compensation
Gain on bargain purchase
Net gains on investments
Changes in operating assets and liabilities:

Restricted cash
Accounts receivable, net
Inventory
Deferred cost of revenue
Prepaids and other assets
Accounts payable
Accrued liabilities
Deferred revenue
Other long-term liabilities

Net cash provided by operating activities

Investing activities:

Purchase of property and equipment
Purchase of marketable securities
Sales and maturities of marketable securities
Acquisitions, net of cash acquired

Financing activities:

Net cash used in investing activities

Proceeds from exercise of stock options and other
Proceeds from employee stock purchase plan
Taxes withheld upon vesting of restricted stock units and restricted stock awards
Principal payments on loans
Proceeds from initial public offering of common stock, net of issuance costs

Net cash provided by (used in) financing activities

Effect of exchange rate changes on cash and cash equivalents
Net increase (decrease) in cash and cash equivalents
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period
Supplemental disclosures of cash flow information

Interest paid
Income taxes paid

Non-cash financing and investing activities

Value of common stock issued in acquisition
Fair value of equity awards assumed in connection with acquisition
Issuance of Series I preferred stock dividends

$

$

$

Years Ended December 31,

2012

2011

2010

$

(28,326)

$

(52,550)

$

(18,553)

—
8,562
262
17,747
—
17,437
(1,029)
—

754
(13,011)
11,308
(13,379)
47
2,554
(869)
26,403
(782)
27,678

(10,179)
—
—
(12,000)
(22,179)

194
4,063
(1,744)
—
—
2,513
45
8,057
38,938
46,995

68
125

—
—
—

244
7,954
2,449
18,121
—
21,603
—
—

300
13,722
8,557
73
(148)
(7,818)
(386)
2,781
(313)
14,589

(7,355)
—
31,755
(60,809)
(36,409)

804
3,938
(10,376)
—
—
(5,634)
88
(27,366)
66,304
38,938

87
79

117,258
1,370
—

$

$

$

$

$

$

967
5,015
77
6,180
173
25,575
—
(37)

629
3,615
(6,001)
8,697
1,237
(4,367)
(2,642)
(11,430)
41
9,176

(5,614)
(79,190)
82,516
—
(2,288)

288
—
(10,004)
(20,000)
57,311
27,595
—
34,483
31,821
66,304

796
40

—
—
900

See accompanying notes to consolidated financial statements.

55

 
CALIX, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.  Description of Business and Significant Accounting Policies

Company

Calix, Inc. (together with its subsidiaries, “Calix,” the “Company,” “our,” “we,” or “us”) was incorporated in August 1999, and is a 

Delaware corporation. We are a leading provider in North America of broadband communications access systems and software for fiber- and 
copper-based network architectures that enable communications service providers ("CSPs") to transform their networks and connect to their 
residential and business subscribers. We enable CSPs to provide a wide range of revenue-generating services, from basic voice and data to 
advanced broadband services, over legacy and next-generation access networks. We focus solely on CSP access networks, the portion of the 
network that governs available bandwidth and determines the range and quality of services that can be offered to subscribers. We develop and 
sell carrier-class hardware and software products, which we refer to as the Unified Access portfolio that are designed to enhance and 
transform CSP access networks to meet the changing demands of subscribers rapidly and cost-effectively.

Basis of Presentation

The Company's fiscal year begins on January 1st and ends on December 31st. Quarterly periods are based on a 4-4-5 fiscal calendar 

with the first, second and third fiscal quarters ending on the 13th Saturday of each fiscal period. 

The accompanying consolidated financial statements, including the accounts of Calix, Inc. and its wholly owned subsidiaries, have 
been prepared in accordance with the requirements of the U.S. Securities and Exchange Commission (“SEC”). In the opinion of management, 
the consolidated financial statements include all normal and recurring adjustments that are considered necessary for the fair presentation of 
the Company’s financial position and operating results. All significant intercompany balances and transactions have been eliminated in 
consolidation. 

Reclassifications

Certain reclassifications have been made to the Consolidated Balance Sheet and the Consolidated Cash Flow Statement for the prior 

year to conform to the current year presentation. The reclassifications are related to customer shipments that have not met the delivery criteria 
for revenue recognition. The impact of the reclassifications to the Consolidated Balance Sheet as of December 31, 2011, included a decrease 
in each of accounts receivable and deferred revenue of $1.4 million, an increase in inventory of $0.6 million, and a decrease in deferred cost 
of revenue of $0.6 million. Accordingly, the changes in these aforementioned asset and liability accounts in the Consolidated Statement of 
Cash Flow for 2011 have been reclassified by the same amounts. The reclassifications did not impact the Company's operating results or cash 
flows from operating, investing, or financing activities as previously reported.

Applicable Accounting Guidance

Any reference in these notes to applicable accounting guidance (“guidance”) is meant to refer to the authoritative U.S. generally 

accepted accounting principles ("GAAP") as found in the Financial Accounting Standards Board (“FASB”) Accounting Standards 
Codification (“ASC”).

Use of Estimates

The preparation of financial statements is in conformity with U.S. GAAP, which requires management to make estimates and 

assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. For the Company, these 
estimates include, but are not limited to: allowances for doubtful accounts and sales returns, excess and obsolete inventory, allowances for 
obligations to its contract manufacturers, useful lives assigned to long-lived assets and acquired intangible assets, warranty costs, and 
contingencies. Actual results could differ from those estimates, and such differences could be material to the Company's financial position 
and results of operations.

Business Combination

The Company accounted for its business acquisitions under ASC Topic 805, “Business Combinations” ("ASC Topic 805"). Under this 

guidance all of the assets acquired and liabilities assumed are recognized at their fair value as of the acquisition date. The excess of the 
purchase price over the estimated fair values of the net tangible and intangible assets acquired is recorded as goodwill. If a business 
combination results in a bargain purchase for the Company, the economic gain resulting from the fair value received being greater than the 
purchase price is recorded as a gain that is included in other income (expense), net in the Consolidated Statements of Comprehensive Loss. 
Prior to recognizing the gain, the Company reassesses whether it has correctly identified all of the assets acquired and liabilities assumed and 
recognizes any additional assets or liabilities that result from that review. The Company also reviews the measurement procedures used in 
valuing the assets acquired and liabilities assumed.

While the Company uses its best estimates and assumptions as a part of calculating the fair value at the acquisition date, the Company's 

estimates are inherently uncertain and subject to refinement. As a result, during the measurement period, which maybe up to one year from 
the acquisition date, the Company may record adjustments retrospectively to the fair value of assets acquired and liabilities assumed, with the 
corresponding offset to goodwill, or records a corresponding other income or expense in the case of a bargain purchase. Upon the conclusion 
of the measurement period or final determination of the fair value of assets acquired or liabilities assumed, whichever comes first, any 
subsequent adjustments are recorded to the Company's Consolidated Statements of Comprehensive Loss.

56

Transaction costs associated with the business combinations are expensed as incurred, and are included in acquisition-related expenses 

within operating expenses in the Consolidated Statements of Comprehensive Loss.

Revenue Recognition

The Company derives revenue primarily from the sale of hardware products and related software. Revenue is recognized when all of 

the following criteria have been met:

•  Persuasive evidence of an arrangement exists.   The Company generally relies upon sales agreements and customer purchase orders 

as evidence of an arrangement.

•  Delivery has occurred.  The Company uses the shipping terms of the arrangement or evidence of customer acceptance to verify 

delivery or performance.

•  Sales price is fixed or determinable.   The Company assesses whether the sales price is fixed or determinable based on the payment 
terms and whether the sales price is subject to refund or adjustment. Payment terms to customers can range from net 30 to net 120 
days. 

•  Collectability is reasonably assured.  The Company assesses collectability based primarily on creditworthiness of customers and their 

payment histories.

Revenue from installation and training services are recognized as the services are completed. Post-sales software support revenue and 

extended warranty services revenue are deferred and recognized ratably over the period during which the services are to be performed. To 
date, service revenue has comprised an insignificant portion of the Company's revenue and the Company has not reported service revenue 
separately from product revenue in its financial statements. In instances where substantive acceptance provisions are specified in the 
customer agreement, revenue is deferred until all acceptance criteria have been met. From time to time, the Company offers customers sales 
incentives, which include volume rebates and discounts. These amounts are estimated on a quarterly basis and recorded net of revenue.

The Company enters into arrangements with certain of its customers who receive government supported loans and grants from the U.S. 

Department of Agriculture's Rural Utility Service (“RUS”) to finance capital spending. Under the terms of an RUS equipment contract that 
includes installation services, the customer does not take possession and control and title does not pass until formal acceptance is obtained 
from the customer. Under this type of arrangement, the Company does not recognize revenue until it has received formal acceptance from the 
customer. For RUS arrangements that do not involve installation services, the Company recognizes revenue in accordance with the revenue 
recognition policy described above.

The Company's products contain both software and non-software components that function together to deliver the products' essential 

functionality. When the Company enters into sales arrangements that consist of multiple deliverables of its product and service offerings, the 
Company allocates the total consideration of the arrangement to each separable deliverable based on its relative selling price. The Company 
limits the amount allocable to delivered elements to the amount that is not contingent upon the delivery of additional items or meeting 
specified performance conditions, and recognize revenue on each deliverable in accordance with its revenue recognition policy. The 
determination of selling price for each deliverable is based on a selling price hierarchy, which is vendor-specific objective evidence 
(“VSOE”) if available, third-party evidence (“TPE”) if VSOE is not available, or estimated selling price (“ESP”) if neither VSOE nor TPE is 
available. VSOE of selling price is based on the price charged when the element is sold separately. In determining VSOE, the Company 
requires that a substantial majority of the selling prices of an element fall within a narrow range when each element is sold separately. The 
Company has established VSOE for its training and post-sales software support services based on the normal pricing practices of these 
services when sold separately. TPE of selling price is established by evaluating whether there are similar competitor products or services that 
are sold in stand-alone sales transaction to similarly situated customers. Generally, the Company's marketing strategy differs from that of its 
peers and its offerings contain a significant level of customization and differentiation such that the comparable pricing of products with 
similar functionality cannot be obtained. Additionally, as the Company is unable to reliably determine what similar competitor products' 
selling prices are on a stand-alone basis, it is not typically able to determine TPE. ESP is established considering multiple factors including, 
but not limited to geographies market conditions, competitive landscape, internal costs, gross margin objectives, characteristics of targeted 
customers and pricing practices. The determination of ESP is made through consultation with and formal approval by management, taking 
into consideration the go-to-market strategy.  

Cost of Revenue

Cost of revenue consists primarily of finished goods inventory purchased from the Company’s contract manufacturers, payroll and 
related expenses associated with managing the contract manufacturers’ relationships, depreciation of manufacturing test equipment, warranty 
costs, excess and obsolete inventory costs, shipping charges, and amortization of certain intangible assets. For the year ended December 31, 
2011, cost of revenue also includes acquisition-related expenses associated with the acquisition of Occam primarily related to a charge 
resulting from the required revaluation of Occam inventory to its estimated fair value and an associated write-down of acquired inventory 
determined as excess and obsolete.

Stock-Based Compensation

In accordance with ASC Topic 718, "Compensation - Stock Compensation" ("ASC Topic 718"), stock-based awards are recorded at fair 

value as of the grant date and recognized to expense over the employee’s requisite service period (generally the vesting period), which the 
Company has elected to amortize on a straight-line basis. Stock-based compensation expense has been reduced by the Company’s estimated 
forfeitures on all unvested awards.

The fair value of stock option and employee stock purchase right is estimated at the grant date using the Black-Scholes option valuation 
model. The fair value of restricted stock unit and restricted stock award is based on the closing market price of the Company's common stock 
on the date of grant. The fair value of performance restricted stock unit ("PRSU") with a market condition is estimated on the date of grant, 
57

using a Monte Carlo simulation model to estimate the total return ranking of the Company's stock in relation to the peer group over each 
performance period. Compensation cost on PRSUs with a market condition is not adjusted for subsequent changes in the Company's stock 
performance or the level of ultimate vesting.

Warranty

The Company offers limited warranties for its hardware products for a period of one or five years, depending on the product type. 
Warranty service revenues are deferred and recognized ratably over the period during which the services are to be performed. The Company 
recognizes estimated costs related to warranty activities as a component of cost of revenue upon product shipment. The estimates are based 
on historical product failure rates and historical costs incurred in correcting product failures. The recorded amount is adjusted from time to 
time for specifically identified warranty exposure. Actual warranty expenses are charged against the Company’s estimated warranty liability 
when incurred. Factors that affect the Company’s warranty liability include the number of installed units and historical and anticipated rates 
of warranty claims and cost per claim.

Research and Development

Research and development costs include costs of developing new products and processes, as well as design and engineering costs. Such 

costs are charged to research and development expense as incurred.

Development costs related to software incorporated in the Company’s products incurred subsequent to the establishment of 
technological feasibility are capitalized and amortized over the estimated useful lives of the related products. Technological feasibility is 
established upon completion of a working model. 

Credit Risk and Inventory Supplier Concentrations

Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash and cash 
equivalents and accounts receivable. Cash equivalents consist of money market funds, which are invested through financial institutions in the 
United States. Such deposits may, at times, exceed federally insured limits. The Company has not experienced any losses in such accounts. 
The Company also has an insignificant amount of cash held by its foreign subsidiaries in China and the U.K. Management believes that the 
financial institutions that hold the Company’s cash and investments are financially sound and, accordingly, minimal credit risk exists with 
respect to these cash and investments.

Concentrations of credit risk in relation to customers with an accounts receivable balance of 10% or greater of total accounts receivable 

and customers with net revenues of 10% or greater of total revenues are presented below for the periods indicated.

CenturyLink

Percentage of Accounts Receivable
At December 31,

2012
13%

2011
12%

Percentage of Revenue
Years Ended December 31,
2011
20%

2010
29%

2012
21%

The Company maintains an allowance for doubtful accounts for estimated losses resulting from the inability of its customers to make 
required payments. The Company records a specific allowance based on an analysis of individual past-due balances. Additionally, based on 
its historical write-offs and collections experience, the Company records an additional allowance based on a percentage of outstanding 
receivables. The Company performs credit evaluations of its customers’ financial condition. These evaluations require significant judgment 
and are based on a variety of factors including, but not limited to, current economic trends, payment history and financial review of the 
customer. Actual collection losses may differ from management’s estimates, and such differences could be material to the Company’s 
financial position and results of operations.

The Company depends primarily on a small number of outside contract manufacturers for the bulk of its finished goods inventory. The 
Company generally purchases its products through purchase orders with its suppliers or contract manufacturers. While the Company seeks to 
maintain a sufficient reserve of its products, the Company’s business and results of operations could be adversely affected by a stoppage or 
delay in receiving such products, the receipt of defective parts, an increase in price of such products or the Company’s inability to obtain 
lower prices from its contract manufacturers and suppliers in response to competitive pressures.

Fair Value of Financial Instruments

The carrying amounts of cash and cash equivalents, trade receivables, marketable securities, accounts payable, and other accrued 

liabilities approximate their fair value due to their relatively short-term nature. The carrying amount of the other long-term liabilities 
approximates its fair value.

Cash, Cash Equivalents, and Marketable Securities

The Company has invested its excess cash primarily in money market funds. Before 2012, the Company also invested some cash in 
highly liquid debt instruments. The Company considers all investments with maturities of three months or less when purchased to be cash 
equivalents. Marketable securities represent highly liquid debt instruments with maturities greater than 90 days at date of purchase. Cash, 
cash equivalents and marketable securities are stated at amounts that approximate fair value based on quoted market prices.

The Company’s investments have been classified and accounted for as available-for-sale. Such investments are recorded at fair value 

and unrealized holding gains and losses are reported as a separate component of comprehensive loss in the stockholders’ equity until realized. 
Should the Company determine that any unrealized losses on the investments are other-than-temporary, the amount of that impairment to be 
recognized in earnings will depend on whether the Company intends to sell the security or more likely than not will be required to sell the 
security before recovery of its amortized cost basis less any current period credit loss. The Company, to date, has not determined that any of 
58

 
 
 
 
  
 
 
the unrealized losses on its investments are considered to be other-than-temporary. Realized gains and losses, which have been immaterial to 
date, are determined on the specific identification method and are reflected in results of operations.

Restricted Cash

As of December 31, 2012, there were no restricted cash balances. Restricted cash consisted of $0.8 million as of December 31, 2011, 

which is related to performance bonds required for the Company’s RUS-funded customer contracts. 

Inventory 

Inventory, which primarily consisted of finished goods purchased from contract manufacturers is stated at the lower of cost, determined 

by the first-in, first-out method, or market value. Inbound shipping costs are included in cost of inventory. In addition, the Company will, 
from time to time, procure component inventory primarily as a result of manufacturing discontinuation of critical components by suppliers. 
The Company regularly monitors inventory quantities on hand and records write-downs for excess and obsolete inventories based on the 
Company’s estimate of demand for its products, potential obsolescence of technology, product life cycles, and whether pricing trends or 
forecasts indicate that the carrying value of inventory exceeds its estimated selling price. These factors are impacted by market and economic 
conditions, technology changes, and new product introductions and require estimates that may include elements that are uncertain. Actual 
demand may differ from forecasted demand and may have a material effect on gross margins. If inventory is written down, a new cost basis is 
established that cannot be increased in future periods.

Deferred Cost of Revenue

When the Company’s products have been shipped, but the product revenue associated with the arrangement has been deferred as a 
result of not meeting the criteria for immediate revenue recognition, the Company also defers the related inventory costs for the delivered 
items until all criteria are met for revenue recognition. Deferred cost of revenue also includes installation service costs related to customer 
installation projects in which the revenue has been deferred until completion of the project and, to a lesser extent, trial orders that are pending 
acceptance.

Property and Equipment

Property and equipment are stated at cost, less accumulated depreciation, and are depreciated using the straight-line method over the 
estimated useful life of each asset. Computer equipment is depreciated over two years; purchased software is depreciated over three years; 
test equipment is depreciated over three years; furniture and fixtures are depreciated over seven years; and leasehold improvements are 
depreciated over the shorter of the respective lease term or the estimated useful life of the asset. Maintenance and repairs are charged to 
expense as incurred.

Goodwill, Intangible Assets and Other Long-Lived Assets

The Company records goodwill when consideration paid in a business acquisition exceeds the fair value of the net tangible assets and 
the identified intangible assets acquired. Goodwill is not amortized but instead is subject to an annual impairment test or more frequently if 
events or changes in circumstances indicate that it may be impaired. The Company evaluates goodwill on an annual basis as of the end of the 
second quarter of each fiscal year. Management has determined that it operates as a single reporting unit and, therefore, evaluates goodwill 
impairment at the enterprise level. To evaluate for impairment, the Company compares its fair value to its carrying value including goodwill. 
The Company determines its fair value using both an income approach and a market approach. Under the income approach, the Company 
determines fair value based on estimated future cash flows, discounted by an estimated weighted-average cost of capital, which reflects the 
overall level of inherent risk of the Company and the rate of return an outside investor would expect to earn. Under the market-based 
approach, the Company utilizes information regarding the Company as well as publicly available industry information to determine earnings 
multiples that are used to value the Company. If the carrying value of the Company exceeds its fair value, the Company will determine the 
amount of impairment loss by comparing the implied fair value of goodwill with the carrying value of goodwill. An impairment charge is 
recognized for the excess of the carrying value of goodwill over its implied fair value.

The Company has completed its annual goodwill impairment test as of June 30, 2012 in July 2012 and determined that the fair value of 

its reporting unit exceeded the carrying value by approximately 15%. See Note 3, “Goodwill and Intangible Assets” of the Notes to 
Consolidated Financial Statements in this Form 10-K for a detailed description. There have been no significant events or circumstances 
affecting the valuation of goodwill subsequent to the annual impairment test performed in July 2012. As of December 31, 2012, there was no 
impairment to the carrying value of the Company's goodwill. There were no impairment losses for goodwill during 2011 and 2010.

Intangible assets with finite useful lives are amortized over their estimated useful life, generally five years. The Company periodically 

evaluates long-lived assets,  including intangible assets,  for impairment whenever events or changes in circumstances indicate that a potential 
impairment may have occurred. If such events or changes in circumstances arise, the Company compares the carrying amount of the long-
lived assets to the estimated future undiscounted cash flows expected to be generated by the long-lived assets. If the estimated aggregate 
undiscounted cash flows are less than the carrying amount of the long-lived assets, an impairment charge, calculated as the amount by which 
the carrying amount of the assets exceeds the fair value of the assets, is recorded. The fair value of long-lived assets is determined based on 
the estimated discounted cash flows expected to be generated from the assets. The Company has reviewed events and changes to its business 
during the year and has determined that there was no impairment to its long-lived assets during 2012. The Company did not incur any 
impairment losses for intangible assets and other long-lived assets during 2011 and 2010.

Income Taxes

The Company evaluates its tax positions and estimates its current tax exposure together with assessing temporary differences resulting 
from differing treatment of items not currently deductible for tax purposes. These differences result in deferred tax assets and liabilities on the 

59

Company’s balance sheets, which are estimated based upon the difference between the financial statement and tax bases of assets and 
liabilities using the enacted tax rates that will be in effect when these differences reverse. In general, deferred tax assets represent future tax 
benefits to be received when certain expenses previously recognized in the Company’s statements of operations become deductible expenses 
under applicable income tax laws or loss or credit carry-forwards are utilized. Accordingly, realization of the Company’s deferred tax assets is 
dependent on future taxable income against which these deductions, losses and credits can be utilized.

The Company must assess the likelihood that the Company’s deferred tax assets will be recovered from future taxable income, and to 
the extent the Company believes that recovery is not more likely than not, the Company must establish a valuation allowance. Management 
judgment is required in determining the Company’s provision for income taxes, the Company’s deferred tax assets and liabilities and any 
valuation allowance recorded against the Company’s net deferred tax assets. Excluding our foreign operations, the Company recorded a full 
valuation allowance at each balance sheet date presented because, based on the available evidence, the Company believes it is more likely 
than not that it will not be able to utilize all of its deferred tax assets in the future. The Company intends to maintain the full valuation 
allowances until sufficient evidence exists to support the reversal of the valuation allowances.

Foreign Currency Translation

Assets and liabilities of the Company’s wholly owned foreign subsidiaries are translated from their respective functional currencies at 

exchange rates in effect at the balance sheet date, and revenues and expenses are translated at the monthly average exchanges rates. Any 
material resulting translation adjustments are reflected as a separate component of stockholders’ equity. Realized foreign currency transaction 
gains and losses were not significant during the years ended December 31, 2012, 2011 and 2010.

Recently Adopted Accounting Guidance

In the first quarter of fiscal year 2012, the Company adopted the FASB guidance in Accounting Standards Update (“ASU”) No. 
2011-05, "Presentation of Comprehensive Income," which requires companies to present the total of comprehensive income, the components 
of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in 
two separate but consecutive statements. This update eliminates the option to present the components of other comprehensive income as part 
of the statement of equity. In December 2011, the FASB issued ASU No. 2011-12, "Deferral of the Effective Date for Amendments to the 
Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in ASU 2011-05," to defer the effective date of 
the specific requirement to present items that are reclassified out of accumulated other comprehensive income to net income alongside their 
respective components of net income and other comprehensive income. Other than changing the presentation of comprehensive income, the 
adoption of this guidance did not have an impact on the financial statements of the Company.

2.  Business Combinations

Acquisition of Ericsson Fiber Access Assets

On November 2, 2012, Calix acquired the fiber access assets of Ericsson Inc. ("Ericsson"), including the Ericsson EDA 1500 GPON 

solution and its complementary ONT portfolio, under an Asset Purchase Agreement ("EFAA Acquisition"). In connection with this 
acquisition, Calix and Ericsson also signed a non-exclusive global reseller agreement, under which Calix will become Ericsson's preferred 
global partner for broadband access applications. Calix expects this partnership to provide Calix with an extensive new global reseller 
channel, and Calix believes that its acquisition of Ericsson's fiber access portfolio delivers powerful new complements to Calix's industry-
leading Unified Access portfolio. Calix expects that this partnership will also provide Ericsson's existing fiber access customers with world-
class support and maintenance, and an expanded portfolio of access systems and software from a leading company totally focused on access. 

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed from Ericsson at the 

acquisition date (in thousands):

Inventory
Other current asset
Property and equipment
Other current liabilities
Deferred tax liability

Net assets acquired
Gain on bargain purchase
Total purchase price

At November 2, 2012
9,361
$
739
3,616
(124)
(563)
13,029
(1,029)
12,000

$

The total consideration for the purchase price was $12.0 million in cash.  Because the fair value of identifiable assets acquired, net of 
liabilities assumed, exceeded the consideration transferred, the Company recognized a bargain purchase gain of $1.0 million, net of income 
taxes.  The Company reassessed the recognition and measurement of identifiable assets acquired and liabilities assumed and concluded that 
all acquired assets and assumed liabilities were recognized and that the valuation procedures and resulting measures were appropriate. The 
gain is included as a separate line item on the Company's 2012 Consolidated Statements of Comprehensive Loss.

Pursuant to the Asset Purchase Agreement, the Company received a credit of approximately $3.3 million, which was recorded at fair 
value as of the date of the acquisition. The credit can be used for consulting services, additional inventory, or any other purpose agreed to by 
both parties. Any unused portion of the credit will expire on August 31, 2013 and will have no cash value.  

60

The Company recognized $1.4 million of acquisition-related costs in 2012 in connection with the EFAA Acquisition. These costs are 

included in the Consolidated Statements of Comprehensive Loss in the line item entitled “Acquisition-related expenses” within Operating 
expenses.

The assets, liabilities, and operating results associated with the EFAA Acquisition have been included in our consolidated financial 

statements from the date of acquisition. For 2012, $0.6 million of our total revenue resulted from the EFAA acquisition. It is impracticable to 
determine the results of operations for EFAA on a standalone basis as the operations associated with these assets have been integrated into 
our operations. Pro forma results of operations have also not been presented because it is impracticable to obtain the historical operating 
results of EFAA before the acquisition on a standalone basis and that the effect of the acquisition was not material to our consolidated results 
of operations.

Acquisition of Occam Networks

On February 22, 2011, the Company completed its acquisition of Occam Networks, Inc. ("Occam") in a stock and cash transaction 
valued at approximately $213.1 million which consisted of $94.5 million of cash consideration and a value of $118.6 million of common 
stock and equity awards issued. In connection with the consummation of the acquisition, each outstanding share of common stock of Occam 
was converted, effective as of February 22, 2011, into the right to receive: (i) 0.2925 shares of Calix common stock and (ii) $3.8337 in cash. 
In addition, (a) each outstanding Occam stock option or restricted stock unit as of immediately prior to the effective time of the acquisition 
which was or became vested as of the effective time of the acquisition with a per share exercise price that was less than (i) $3.8337 plus (ii) 
0.2925 multiplied by the average volume weighted average trading price of Calix common stock during the five consecutive trading days 
ending on the trading day that was one day before the effective time of the acquisition, such amount being referred to as the cash-out 
consideration and (b) Occam options or restricted stock units held by persons who were not Occam employees or consultants immediately 
prior to the effective time of the acquisition were automatically canceled and extinguished and the vested portion thereof was automatically 
converted into the right to receive the cash-out consideration for the aggregate number of shares of Occam common stock that were issuable 
upon the exercise of such stock options or restricted stock units, less any applicable per share exercise price.

Unvested portions of each outstanding Occam stock option or restricted stock unit held by Occam employees who continued to be 
employed by Calix or its subsidiaries after the effective time of the merger transaction that were not cashed out and canceled as described 
above were, at the effective time, automatically converted into options or restricted stock units, as the case may be, for Calix common stock, 
subject to adjustments in accordance with the compensatory award exchange ratio, and subject to the terms and conditions of such award 
prior to the effective time, including vesting and exercisability. The fair value of Calix stock options and restricted stock units issued to 
employees of Occam was $5.8 million including those accelerated for Occam executives associated with their severance agreements, which 
were executed subsequent to the acquisition date. The fair value of options was estimated using a Black-Scholes option pricing model.

The following table represents the weighted average assumptions used to estimate fair value of stock options:

Expected volatility
Expected life (years)
Expected dividend yield
Risk-free interest rate

At February 22, 2011
52%
3.95
—
1.65%

The acquisition of Occam has been accounted for under the acquisition method of accounting, which requires the acquired assets and 
assumed liabilities to be recorded based on their estimated fair values. The fair values assigned to the acquired assets and assumed liabilities 
are based on valuations using management's best estimates and assumptions utilizing the best information available at the time these 
consolidated financial statements were issued. During the measurement period (which is not to exceed one year from the acquisition date), 
the Company is required to retrospectively adjust the provisional assets or liabilities if new information is obtained about facts and 
circumstances that existed as of the acquisition date that, if known, would have resulted in the recognition of those assets or liabilities as of 
that date.

61

The following table summarizes the fair value of the acquired assets and assumed liabilities related to the acquisition of Occam (in 

thousands):

At February 22, 2011

Cash and cash equivalents
Restricted cash
Accounts receivable
Inventory
Prepaid expenses and other assets
Property and equipment
Intangible assets:

Trade name (useful life of 6 months)
Customer relationships (useful life of 5 years)
Core developed technology (useful life of 5 years)
In-process technology
Purchase order backlog (useful life of 10 months)
Total intangible assets

Goodwill
Current liabilities
Deferred revenue
Long-term liabilities

Total

$

$

33,631
1,054
16,854
29,229
854
7,363

2,290
51,040
25,494
16,270
2,560
97,654
50,599
(22,414)
(866)
(890)
213,068

The Company has finalized the fair values of the acquired assets and assumed liabilities and has closed the measurement period as of 

June 25, 2011.

Trade names represent acquired product names, which are expected to have a useful life of six months. Customer relationships 

represent agreements with existing Occam customers and have estimated useful lives of five years.

Core developed technology represents technology that has reached technological feasibility and includes Occam's primary product 

line. The fair value of the core developed technology is determined using future discounted cash flows related to the projected income stream 
of the developed technology for a discrete projection period. Core developed technology will be amortized over its estimated useful life of 
five years.

In-process technology represents projects that have not reached technological feasibility at the time of the acquisition and they do not 
have a finite useful life. In-process technology will be impaired, if abandoned, or amortized in future periods, depending on the ability of the 
Company to use the research and development in future periods. See Note 3, "Goodwill and Intangible Assets" of the Notes to Consolidated 
Financial Statements in this Form 10-K for an update of the in-process technology acquired from Occam.

Acquired backlog represents goods and services that the Occam customers are contractually obligated to receive in the future and is 

expected to have a ten month life.

During the year ended December 31, 2011, the Company incurred $20.0 million of acquisition-related expenses that was recorded in 

cost of revenue, resulting from the required revaluation of inventory to its estimated fair value and an associated write-down of inventory 
determined as excess and obsolete. The Company also recorded $12.9 million of acquisition-related expenses within operating expenses in 
the twelve months ended December 31, 2011, related to severance for terminated employees and salaries for transitional employees, 
expenses associated with consolidating facilities, transaction costs for financial advisory, legal and accounting services, and stock-based 
compensation expense primarily related to accelerated vesting for certain Occam executives who terminated subsequent to the acquisition 
date. 

The premium paid by the Company in this transaction is attributable to the strategic benefits of creating a more competitive and 
efficient company, more capable of competing against larger telecommunications equipment companies in more markets and the significant 
cost synergies that would be obtained by the combined organization. The combined organization is expected to provide communications 
service providers globally with an enhanced portfolio of advanced broadband access systems, and accelerate innovation across the expanded 
Calix Unified Access portfolio. The acquisition is expected to result in more access options over both fiber and copper for communications 
service providers to deploy, which could expedite the proliferation of advanced broadband services to both residential and business 
subscribers, including such services as high-speed Internet, Internet protocol television, voice over internet protocol ("VOIP"), Ethernet 
business services, and other advanced broadband applications.

62

The results of operations of Occam are included in the Company's consolidated results of operations beginning on the February 22, 

2011 acquisition date. The following pro forma information of 2010 gives effect to the business combination that was completed during the 
quarter ended March 26, 2011 as if the business combination occurred at the beginning of 2010. The pro forma results are not necessarily 
indicative of what actually would have occurred had the business combination been in effect for the period presented:

(in thousands)
Revenue
Net loss attributable to common stockholders

$
$

Year Ended December 31, 2010

381,495
(47,614)

The above Pro forma results have been adjusted for the following material adjustments, as if the business combination was completed 

on January 1, 2010:

1.  Pro forma revenue for the year ended December 31, 2010, reflects elimination of deferred revenue of $13.0 million and related 
deferred cost of revenue of $6.2 million, associated with Occam's products shipped but pending customer acceptance, as of 
December 31, 2009, as this would have been assigned little or no value, under the acquisition method of accounting.

2.  Pro forma net loss for the year ended December 31, 2010, includes amortization of intangible assets of $18.1 million that would 

have been acquired as if the business combination was completed on January 1, 2010.

3.  Goodwill and Intangible Assets

Goodwill

Goodwill was recorded as a result of the Company's acquisitions of Occam in February 2011 and Optical Solutions, Inc. ("OSI") in 

February 2006. This goodwill is not deductible for tax purposes, and there have been no adjustments to goodwill since the acquisition 
dates. The table below sets forth changes in carrying amount of goodwill during 2011 and 2012 (in thousands):

Balance at beginning of year

Goodwill acquired during year

Balance at end of year

2012

2011

116,175
—
116,175

$

$

65,576
50,599
116,175

$

$

In accordance with our annual goodwill impairment test, we evaluated the potential impairment of goodwill as of June 30, 2012 in 

July 2012. The goodwill impairment testing process involved the use of significant assumptions, estimates and judgments, and is subject to 
inherent uncertainties and subjectivity in determination of the fair value of our sole reporting unit. In performing the first step of the 
goodwill impairment test, we determined the fair value of our reporting unit by combining two valuation methods, a discounted cash flow 
analysis (DCF) and market multiples of comparable publicly traded companies. Under the DCF method, we prepared annual projections of 
future cash flows over a period of five years (the “discrete projection period”) and applied a terminal value assumption to the final year 
within the discrete projection period to estimate the total value of the cash flows beyond the final year. These projected cash flow estimates 
were then discounted using a discount rate that reflected market-based estimates based on comparable publicly traded companies, and 
included an additional risk premium specific to Calix. Under the market multiples method, fair value was determined by applying multiples 
of Revenue and EBITDA (earnings before interest, taxes, depreciation and amortization). In addition, we analyzed the fair value of our 
reporting unit and our total market capitalization for reasonableness, taking into account certain factors, including control premium, which 
were based on values observed in market transactions. Based on our analyses, we determined that the fair value of our reporting unit 
exceeded the carrying value by approximately 15% and no indicators of impairment were evident. However, significant changes in these 
estimates and assumptions could create future impairment losses to goodwill.

At the end of 2012, the Company reviewed events and changes to its business subsequent to the impairment test performed in July 

2012 and concluded that there were no indicators of impairment to the carrying value of its goodwill through December 31, 2012. As of 
December 31, 2012, there was no impairment to the carrying value of the Company's goodwill.

63

Intangible Assets

Intangible assets are carried at cost, less accumulated amortization. The details of intangible assets as of December 31, 2012 and 

December 31, 2011 are disclosed in the following table (in thousands):

Core developed technology
Customer relationships
Purchase order backlog
Trade name

Total amortizable intangible assets

In-process technology

Total intangible assets, excluding
goodwill

December 31, 2012

December 31, 2011

$

Gross
Carrying
Amount

68,964
54,740
—
—
123,704
—

Accumulated
Amortization
(38,986)
$
(22,417)
—
—
(61,403)
—

Net
$ 29,978
32,323
—
—
62,301
—

$

Gross
Carrying
Amount

52,694
54,740
4,260
2,290
113,984
16,270

Accumulated
Amortization
(31,447)
$
(12,209)
(4,260)
(2,290)
(50,206)
—

Net
$ 21,247
42,531
—
—
63,778
16,270

$

123,704

$

(61,403)

$ 62,301

$

130,254

$

(50,206)

$ 80,048

At the end of the first quarter of 2012, upon the completion of the research and development efforts associated with the $16.3 
million in-process technology that was acquired from Occam, the Company determined that this technology had a useful life of 5 years and 
therefore reclassified it as core developed technology. The Company began amortizing this intangible asset to cost of revenue during the 
second quarter of 2012.

Amortization expense for intangible assets was $17.7 million, $18.1 million, and $6.2 million for the years ended December 31, 

2012, 2011, and 2010, respectively. Expected future amortization expense for the fiscal years indicated is as follows (in thousands):

Period
2013
2014
2015
2016
2017

Total

Expected Amortization 
Expense

$

$

18,561
18,561
18,561
5,805
813
62,301

4. Balance Sheet Details

Cash and cash equivalents consisted of the following (in thousands):

Cash
Money market funds

Total cash and cash equivalents

December 31,
2012

December 31,
2011

$

$

27,157
19,838
46,995

$

$

19,109
19,829
38,938

As of December 31, 2012 and 2011, the Company did not hold any marketable securities and therefore there were no unrealized 

gains or losses. Realized gains and losses on the investments are determined on the specific identification method and are reflected in 
results of operations. The Company did not experience any significant realized gains or losses on its investments through December 31, 
2012.

Inventory consisted of the following (in thousands):

Raw materials
Finished goods

Total inventory

December 31,
2012

December 31,
2011

$

$

9,377
33,905
43,282

$

$

3,077
42,152
45,229

64

 
 
Accounts receivable, net consisted of the following (in thousands):

Accounts receivable
Allowance for doubtful accounts
Product return reserve

Accounts receivable, net

Property and equipment, net consisted of the following (in thousands):

Computer equipment and purchased software
Test equipment
Furniture and fixtures
Leasehold improvements

Total

Accumulated depreciation and amortization

Property and equipment, net

December 31,
2012

December 31,
2011

$

$

$

$

61,680
(421)
(1,740)
59,519

December 31,
2012

31,582
37,595
1,470
6,763
77,410
(56,327)
21,083

$

$

$

$

47,745
(402)
(835)
46,508

December 31,
2011

28,477
29,849
1,480
6,342
66,148
(50,018)
16,130

Depreciation and amortization expense was $8.6 million, $8.0 million, and $5.0 million for the years ended December 31, 2012, 

2011, and 2010, respectively. 

Accrued liabilities consisted of the following (in thousands):

Accrued warranty
Accrued compensation and related benefits
Accrued professional and consulting fees
Accrued excess and obsolete inventory at contract manufacturers
Accrued customer rebates
Accrued business travel expenses
Sales and use tax payable
Income taxes payable
Accrued other

Total accrued liabilities

December 31,
2012

December 31,
2011

$

$

11,762
12,906
1,740
1,357
1,565
593
929
627
4,697
36,176

$

$

12,104
12,406
1,741
3,784
1,549
383
861
173
3,213
36,214

Deferred cost of revenue consisted entirely of products and services. Deferred revenue consisted of the following (in thousands):

Deferred Revenue:
Product and services - current
Extended Warranty - current
Extended warranty - non-current
Product and services - non-current
Total deferred revenue

December 31,
2012

December 31,
2011

$

$

36,715
2,600
15,711
71
55,097

$

$

13,079
2,268
13,282
65
28,694

65

The following table provides the balances and changes in the components of accumulated other comprehensive income (loss) for the 

years indicated (in thousands):

Foreign Currency 
Translation 
Adjustments

Unrealized Gain
(Loss) on
Investments

Accumulated Other 
Comprehensive 
Income (Loss)

Balance at 12/31/2009

Current period other comprehensive income

Balance at 12/31/2010

Current period other comprehensive income (loss)

Balance at 12/31/2011

Current period other comprehensive income

Balance at 12/31/2012

$

$

—
10
10
88
98
34
132

$

$

(17)
38
21
(21)
—
—
—

$

$

(17)
48
31
67
98
34
132

5.  Commitments and Contingencies

Lease Commitments

The Company leases office space under non-cancelable operating leases. Certain of the Company’s operating leases contain renewal 
options and rent acceleration clauses. Future minimum payments under the non-cancelable operating leases consisted of the following as of 
December 31, 2012 (in thousands):

Period
2013
2014
2015
2016
2017
Thereafter
Total

Minimum Future Lease 
Payments

$

$

4,255
2,405
1,509
989
880
560
10,598

The above total minimum payments have not been reduced by minimum sublease rentals of $0.3 million due in the future under 

non-cancelable sublease of a portion of the Company's office in Fremont, California.

The Company leases its primary office space in Petaluma, California under a lease agreement ("Petaluma Lease") that extends 

through February 2014. The Company received a lease incentive consisting of $1.2 million in leasehold improvements provided by the 
lessor. The Company has capitalized the full amount of the lease incentive and this incentive is being amortized through rent expense over 
the lease term. As of December 31, 2012, the unamortized lease incentive related to this lease was $0.3 million. Payments under the 
Company’s operating leases that escalate over the term of the lease are recognized as rent expense on a straight-line basis. On January 28, 
2013, the Company entered into an amendment to the Petaluma Lease. See Note 14, "Subsequent Event" for detailed discussions.

The above table also includes future minimum lease payments for our facilities in Minneapolis, Minnesota, Acton, Massachusetts, 

Nanjing, China, Richardson, Texas, and Fremont, San Jose, and Santa Barbara, California, which expire at various dates through 2018, and 
for certain office equipment under non-cancelable operating lease agreements, which expire at various dates through 2015. A lease 
agreement for our office in San Jose, California was entered into in November 2012 and expires in August 2018. 

Rent expense, net of sublease income, was $3.5 million, $3.6 million, and $2.1 million for the years ended December 31, 2012, 2011 

and 2010, respectively.

Purchase Commitments

The Company’s primary contract manufacturers place orders for component inventory in advance based upon the Company’s build 

forecasts in order to reduce manufacturing lead times and ensure adequate component supply. The components are used by the contract 
manufacturers to build the products included in the build forecasts. The Company does not take ownership of the components and any 
outstanding orders do not represent firm purchase commitments pursuant to the Company’s agreement with the contract manufacturer. The 
Company will provide purchase orders to its contract manufacturers in order to fulfill its monthly finished product inventory requirements. 
The Company incurs a liability when the manufacturer has converted the component inventory to a finished product and takes ownership 
of the inventory when transferred to the designated shipping warehouse. However, historically, the Company has reimbursed its primary 
contract manufacturer for component inventory purchases when this inventory has been rendered excess or obsolete, for example due to 
manufacturing and engineering change orders resulting from design changes, manufacturing discontinuation of parts by its suppliers, or in 
cases where inventory levels greatly exceed projected demand. The estimated excess and obsolete inventory liabilities related to such 
manufacturing and engineering change orders, which are included in accrued liabilities in the accompanying balance sheets, were $1.4 

66

million and $3.8 million as of December 31, 2012 and 2011, respectively. The Company records these amounts in cost of products and 
services in its Consolidated Statements of Comprehensive Loss.

As of December 31, 2012, the Company had non-cancelable outstanding purchase orders of $10.3 million for finished goods to be 

delivered by its contract manufacturers within one year. 

Accrued Warranty

The Company provides a warranty for its hardware products. Hardware generally has a one to five-year warranty from the date of 
shipment. The Company accrues for potential warranty claims based on the Company’s historical claims experience. The adequacy of the 
accrual is reviewed on a periodic basis and adjusted, if necessary, based on additional information as it becomes available.

Changes in the Company’s warranty reserve in the periods as indicated were as follows (in thousands):

Balance at beginning of period

Accrued warranty from the Occam acquisition
Warranty charged to cost of revenue
Utilization of warranty

Balance at end of period

Litigation

2012

Years Ended December 31,
2011

2010

$

$

12,104
—
4,701
(5,043)
11,762

$

$

3,789
8,500
5,883
(6,068)
12,104

$

$

4,213
—
5,258
(5,682)
3,789

From time to time, the Company is involved in various legal proceedings arising from the normal course of business activities.

On September 16, 2010, the Company, two direct, wholly owned subsidiaries of the Company, and Occam entered into an 

Agreement and Plan of Merger and Reorganization (the “Merger Agreement”). In response to the announcement of the Merger Agreement, 
on October 6, 2010, a purported class action complaint was filed by stockholders of Occam in the Delaware Court of Chancery: Steinhardt 
v. Howard-Anderson, et al. (Case No. 5878-VCL). On November 24, 2010, these stockholders filed an amended complaint, or the amended 
Steinhardt complaint. The amended Steinhardt complaint names Occam and the members of the Occam board of directors as defendants. 
The amended Steinhardt complaint does not name Calix as a defendant.

The amended Steinhardt complaint generally alleges that the members of the Occam board breached their fiduciary duties in 

connection with the acquisition of Occam by Calix, by, among other things, engaging in an allegedly unfair process and agreeing to an 
allegedly unfair price for the merger transaction. The amended Steinhardt complaint also alleges that Occam and the former members of 
the Occam board breached their fiduciary duties by failing to disclose certain allegedly material facts about the merger transaction in the 
preliminary proxy statement and prospectus included in the Registration Statement on Form S-4 that Calix filed with the SEC on 
November 2, 2010. The amended Steinhardt complaint sought injunctive relief rescinding the merger transaction and award of damages in 
an unspecified amount, as well as plaintiffs’ costs, attorney’s fees, and other relief.

The merger transaction was completed on February 22, 2011. On January 6, 2012, the Delaware court ruled on a motion for 
sanctions brought by the defendants in the Delaware case against certain of the lead plaintiffs. The Delaware court found that lead plaintiffs 
Michael Steinhardt, Steinhardt Overseas Management, L.P., and Ilex Partners, L.L.C., collectively the “Steinhardt Plaintiffs,” had engaged 
in improper trading of Calix shares, and dismissed the Steinhardt Plaintiffs from the case with prejudice. The court further held that the 
Steinhardt Plaintiffs are: (i) barred from receiving any recovery from the litigation, (ii) required to self-report to the SEC, (iii) directed to 
disclose their improper trading in any future application to serve as lead plaintiff, and (iv) ordered to disgorge trading profits of $0.5 
million, to be distributed to the remaining members of the class of former Occam stockholders. The Delaware court also granted the motion 
of the remaining lead plaintiffs, Herbert Chen and Derek Sheeler, for class certification, and certified Messrs. Chen and Sheeler as class 
representatives. The certified class is a non-opt-out class consisting of all owners of Occam common stock whose shares were converted to 
shares of Calix on the date of the merger transaction, with the exception of the defendants in the Delaware action and their affiliates. Chen 
and Sheeler, on behalf of the class of similarly situated former Occam stockholders, continue to seek an award of damages in an 
unspecified amount.

The Company believes that the allegations in the Delaware action are without merit and intends to continue to vigorously contest the 

action. However, there can be no assurance that the Company will be successful in defending this ongoing action. In addition, the 
Company has obligations, under certain circumstances, to hold harmless and indemnify each of the former Occam directors against 
judgments, fines, settlements and expenses related to claims against such directors and otherwise to the fullest extent permitted under 
Delaware law and Occam’s bylaws and certificate of incorporation. Such obligations may apply to this lawsuit.

The Company is not currently a party to any other legal proceedings that, if determined adversely to the Company, would 

individually or in the aggregate have a material adverse effect on the Company’s business, operating results or financial condition.

Guarantees

The Company from time to time enters into certain types of contracts that contingently require it to indemnify various parties against 

claims from third parties. These contracts primarily relate to (i) certain real estate leases, under which the Company may be required to 
indemnify property owners for environmental and other liabilities, and other claims arising from the Company’s use of the applicable 

67

 
premises, (ii) certain agreements with the Company’s officers, directors, and employees, under which the Company may be required to 
indemnify such persons for liabilities arising out of their relationship with the Company, (iii) contracts under which the Company may be 
required to indemnify customers against third-party claims that a Company product infringes a patent, copyright, or other intellectual 
property right and (iv) procurement or license agreements, under which the Company may be required to indemnify licensors or vendors 
for certain claims that may be brought against them arising from the Company’s acts or omissions with respect to the supplied products or 
technology.

Generally, a maximum obligation under these contracts is not explicitly stated. Because the obligated amounts associated with these 

types of agreements are not explicitly stated, the overall maximum amount of the obligation cannot be reasonably estimated. Historically, 
the Company has not been required to make payments under these obligations, and no liabilities have been recorded for these obligations in 
the Company’s balance sheets.

6.  Fair Value Measurements 

In accordance with ASC Topic 820, "Fair Value Measurements and Disclosures," (“ASC Topic 820”), the Company measures its 

cash equivalents and marketable securities at fair value on a recurring basis. ASC Topic 820 clarifies that fair value is an exit price, 
representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market 
participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants 
would use in pricing an asset or liability. As a basis for considering such assumptions, ASC Topic 820 establishes a three-tier value 
hierarchy, which prioritizes the inputs used in measuring fair value as follows:

Level 1 – Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.

Level 2 – Observable inputs other than quoted prices included in Level 1 for similar instruments in active markets, quoted prices for 

identical or similar instruments in markets that are not active, and model-driven valuations in which all significant inputs and significant 
value drivers are observable in active markets.

Level 3 – Unobservable inputs to the valuation derived from fair valuation techniques in which one or more significant inputs or 

significant value drivers are unobservable. The fair value hierarchy also requires the Company to maximize the use of observable inputs, 
when available, and to minimize the use of unobservable inputs when determining inputs and determining fair value.

As of December 31, 2012 and December 31, 2011, the fair values of certain of the Company’s financial assets were determined 

using the following inputs (in thousands):

As of December 31, 2012
Money market funds

Total

As of December 31, 2011
Money market funds

Total

Level 1

Total

19,838
19,838

Level 1

19,829
19,829

$
$

$
$

19,838
19,838

Total

19,829
19,829

$
$

$
$

The Company’s valuation techniques used to measure the fair values of money market funds were derived from quoted market 

prices as active markets for these instruments exist. The Company has no level 2 or level 3 financial assets.

7.  Net Loss per Share

The following table sets forth the computation of basic and diluted net loss per share for the periods indicated (in thousands, except per 

share data):

Numerator:

Net loss attributable to common stockholders

Denominator:

Weighted-average common shares outstanding

Basic and diluted net loss per common share

Years Ended December 31,

2012

2011

2010

$

$

(28,326)

$

(52,550)

$

(19,453)

48,180

45,546

(0.59)

$

(1.15)

$

29,778

(0.65)

For the year ended December 31, 2012 and 2011, unvested restricted stock awards are included in the calculation of basic weighted-

average shares because such shares are participating securities, however the impact was immaterial. 

As the Company incurred net losses in the periods presented, the following table displays the Company’s other outstanding common 

stock equivalents that were excluded from the computation of diluted net loss per share, as the effect of including them would have been anti-
dilutive (in thousands):

68

 
 
Restricted stock units and performance restricted stock units
Stock options
Employee stock purchase plan
Common stock warrants

Total common stock equivalents

December 31,
2012

December 31,
2011

December 31,
2010

1,945
2,213
369
23
4,550

1,775
1,661
326
23
3,785

3,426
735
177
65
4,403

8.  Stockholders’ Equity

Common Stock

On March 2, 2010, the Company’s board of directors approved an amended and restated certificate of incorporation that increased the 

authorized common stock to 100 million shares and the authorized preferred stock to 5.0 million shares effective immediately prior to the 
completion of the Company’s initial public offering on March 26, 2010.

On March 21, 2010, the Company’s board of directors approved an amended and restated certificate of incorporation effecting a 2-
for-3 reverse stock split of its common stock and all convertible preferred stock. The par value and the authorized shares of the common stock 
and convertible preferred stock were not adjusted as a result of the reverse stock split. All issued and outstanding common stock, convertible 
preferred stock, warrants for common stock, warrants for preferred stock, and per share amounts contained in the financial statements have 
been retroactively adjusted to reflect this reverse stock split for all periods presented. The reverse stock split was effected on March 23, 2010.

On March 26, 2010, the Company completed its initial public offering in which 4,166,666 shares of common stock were sold by the 

Company at a public offering price of $13.00 per share. Gross proceeds of $54.2 million from the sale of common stock by the Company 
were reduced by issuance costs of $4.6 million and underwriters fees of $3.8 million. On April 8, 2010, the Company issued and sold 949,339 
shares of common stock resulting from the exercise of the underwriters’ option to purchase common shares associated with the Company’s 
initial public offering. This sale resulted in gross proceeds of $12.3 million based on an initial public offering price of $13.00 per share of 
common stock, which were reduced by underwriters’ discount and offering expenses payable by the Company of $0.8 million.

On February 22, 2011, in connection with the acquisition of Occam, the Company issued 6.4 million shares of the Company’s common 
stock, a value of $117.2 million. For more information regarding the acquisition of Occam see Note 2, “Business Combinations” of the Notes 
to Consolidated Financial Statements in this Form 10-K.

Holders of our common stock are entitled to receive dividends, if any, as may be declared from time to time by our board of directors 
out of legally available funds. No dividends have been declared or paid as of December 31, 2012. In the event of our liquidation, dissolution 
or winding up, holders of our common stock will be entitled to share ratably in the net assets legally available for distribution to stockholders 
after the payment of all of our debts and other liabilities and the satisfaction of any liquidation preference granted to the holders of any then 
outstanding shares of preferred stock.

Preferred Stock

The board of directors has the authority, without action by stockholders with the exception of stockholders who hold board positions, 

to designate and issue up to 5.0 million shares of preferred stock in one or more series and to fix the rights, preferences, privileges and 
restrictions thereof. These rights, preferences and privileges could include dividend rights, conversion rights, voting rights, terms of 
redemption, liquidation preferences, sinking fund terms and the number of shares constituting any series or the designation of such series, any 
or all of which may be greater than the rights of common stock. The issuance of the Company’s preferred stock could adversely affect the 
voting power of holders of common stock and the likelihood that such holders will receive dividend payments and payments upon 
liquidation. In addition, the issuance of preferred stock could have the effect of delaying, deferring or preventing a change in control of the 
Company or other corporate action. Subsequent to the Company’s initial public offering and the conversion of all preferred stock outstanding 
at that date, the board of directors has not designated any rights, preference or powers of any preferred stock and no shares of preferred stock 
have been issued.

Equity Incentive Plans

Prior to March 2010, the Company had the 2000 Stock Plan ("2000 Plan") and the Amended and Restated 2002 Stock Plan ("2002 

Plan") (together, "Prior Plans"). Under the Prior Plans, the Company may grant incentive stock options at a price not less than 100% of the 
fair market value of the common stock on the date of grant and non-statutory stock options at a price not less than 85%, or, with respect to the 
2002 Plan, 100% of the fair market value of the common stock on the date of grant. Before April 2004, certain options could be granted with 
the right to exercise those options before vesting. The majority of the stock options granted under the Prior Plans vest over 4 years and expire 
in 10 years.

On March 2, 2010, the Company’s Board of Directors approved the 2010 Equity Incentive Award Plan ("2010 Plan") which allows the 

Company to grant stock options, restricted stock awards ("RSA"), restricted stock units ("RSU"), performance restricted stock units 
("PRSU"), stock appreciation rights, dividend equivalents, deferred stock, and stock payments to employees, directors and consultants of the 
Company. A total of 4,666,666 shares of common stock were reserved for future issuance under the 2010 Plan, which became effective upon 
the completion of the Company’s initial public offering of common stock. In addition, on the first day of each year beginning in 2011 and 
ending in 2020, the 2010 Plan provides for an annual automatic increase to the shares reserved for issuance and no more than 17,150,494 

69

shares of Common Stock may be issued upon the exercise of Incentive Stock Options. Pursuant to the automatic annual increase, 666,666 and 
666,666 additional shares were reserved under the 2010 Plan on January 1, 2012 and 2011, respectively.

Upon the effectiveness of the 2010 Plan, equity awards were granted only under the 2010 Plan and shares of common stock previously 

reserved for issuance under the Prior Plans became available for issuance under the 2010 Plan. To date, awards granted under the 2010 Plan 
consist of stock options, RSAs, RSUs and PRSUs. 

Stock options granted under the 2010 Plan are granted in general at a price not less than 100% of the fair market value of the common 
stock on the date of grant. Generally, the options issued under the 2010 Plan vest 25% on the first anniversary of the vesting commencement 
date and on a monthly basis thereafter for a period of an additional three years. The options have a maximum term of ten years. 

Each RSU granted under the 2010 Plan represents a right to receive one share of the Company’s common stock (subject to adjustment 

for certain specified changes in the capital structure of the Company) upon the completion of a specific period of continued service. The 
majority of RSUs granted vest over four years.

In July 2011, the Company granted 423,000 RSAs to executives under the 2010 Plan, which vest 25% per year for 4 years from the 

grant date. Upon issuance of RSA, the holder is entitled to have all the rights of a stockholder, subject to the restrictions in his or her Award 
Agreement, including the right to receive all dividends and other distributions paid or made with respect to the shares. 

In the first quarter of 2012, the Company began to grant PRSUs to its executives. The performance criterion is based on the relative 
total shareholder return (“TSR”) of Calix common stock as compared to the TSR of the Company’s peer group. The Company established 
two-year and three-year performance periods that are from January 1, 2012 to December 31, 2013 and 2014, respectively. The TSR is 
calculated by dividing (a) the average closing trading price for the 90-day period ending on the last day of the applicable performance period 
by (b) the average closing trading price for the 90-day period immediately preceding January 1, 2012. This TSR is then used to derive the 
achievement ratio, which is then multiplied by the number of units in the grant to derive the common stock to be issued for each performance 
period, which may equal from zero percent (0%) to two hundred percent (200%) of the target award. 

Stock Option Exchange Program

On September 23, 2009, the Company completed a stock option exchange program, which was approved by its board of directors in 

July 2009, pursuant to which eligible employees were able to exchange eligible stock options for restricted stock units on a one-for-one basis. 
Pursuant to the exchange, the Company canceled options for 3.4 million shares of the Company’s common stock and issued an equivalent 
number of RSUs to eligible holders on September 23, 2009. The vesting schedule for the RSUs was as follows: 50% of the RSUs vested on 
the first day the trading window opened for employees that was more than 180 days following the effective date of an initial public offering, 
which vesting date was October 26, 2010, or the First Vesting Date, and the remaining 50% of the RSUs vested on the first day the trading 
window opens for employees that is more than 180 days after the First Vesting Date, which second vesting date was in May 2011, in each 
case, subject to the employee’s or director’s continuous service to the Company through the corresponding vesting date.  In connection with 
the RSU grants, the unrecognized compensation expense related to the exchanged options was expensed over the remainder of the original 
vesting period of the options exchanged. The incremental cost due to the exchange was deferred until a liquidity event, which happened with 
the Company’s IPO, and had been recognized in accordance with the vesting periods described above.

Stock Options

The following table summarizes the activity of stock options under the Company’s equity incentive plans (in thousands, except per 

share data):

Stock Options
Outstanding as of December 31, 2011

Granted
Exercised
Forfeited or expired

Outstanding as of December 31, 2012
Vested and expected to vest at December 31, 2012

Weighted-
Average
Exercise Price
Per Share

Weighted-Average
Remaining
Contractual Life
(in years)

Aggregate
Intrinsic
   Value (1)

Number of
Shares

1,661
795
(115)
(128)
2,213
2,146

$

$
$

15.33
8.76
1.69
18.22
13.51
13.60

7.8
7.8

$
$

1,319
1,287

(1) Amounts represent the difference between the exercise price and the fair market value of common stock at December 31, 2012 

for all in the money options outstanding.

During the years ended December 31, 2012, 2011, and 2010, total intrinsic value of stock options exercised was $0.6 million, $2.7 

million, and $1.9 million, respectively. Total cash received from employees as a result of stock option exercises in 2012, 2011, and 2010 was 
$0.2 million, $0.8 million, and $0.3 million, respectively.

70

                                                                                  
The following table summarizes information about stock options outstanding and exercisable at December 31, 2012 (in thousands, 

except year and per share data):

Options Outstanding
Weighted-Average
Remaining
Contractual Life
(in years)
7.1
8.8
8.0
8.1
3.3
7.8

Weighted-
Average
Exercise Price
Per Share

$

$

5.52
9.72
15.74
21.60
40.56
13.51

Number
of Shares
Outstanding
589
601
492
447
84
2,213

Options Exercisable

Number
of Shares
Exercisable
263
164
247
218
84
976

Weighted-
Average
Exercise Price
Per Share

$

$

4.31
9.37
15.53
21.78
40.56
15.01

Range of Exercise Prices

$

$

6.80
0.49 — $
10.71
6.95 —
18.86
10.85 —
19.40 —
31.19
33.57 — 4,401.93
0.49 — $ 4,401.93

Restricted Stock Units, Performance Restricted Stock Units, and Restricted Stock Awards

The following table summarizes the activities of the Company's RSUs, PRSUs, and RSAs under the Company’s equity incentive plans 

(in thousands, except per share data):

RSUs

PRSUs

RSAs

Weighted-
Average
Grant Date
Fair Value
Per Share

Weighted-
Average
Grant Date
Fair Value
Per Share

Number of
Shares

Weighted-
Average
Grant Date
Fair Value
Per Share

Number of
Shares

Number of
Shares

1,775
683
(642)
(54)
1,762

$

$

14.27
6.55
13.11
15.20
11.67

— $
190
—
(7)
183

$

—
14.81
—
15.61
14.78

423
—
(99)
(25)
299

$

$

21.67
—
21.67
21.67
21.67

Outstanding at December 31, 2011

Granted
Vested
Canceled

Outstanding at December 31, 2012

Upon vesting of certain RSUs and RSAs, the Company withheld shares with value equivalent to the employees’ minimum statutory 

obligation for the applicable income and other employment taxes, and remitted the cash to the appropriate taxing authorities. The number of 
shares withheld was based on the value of the RSUs or RSAs on their vesting date as determined by the Company’s closing stock price. The 
withheld shares are reserved for future grant and issuance under the 2010 Plan.

Employee Stock Purchase Plan

The Company’s 2010 Employee Stock Purchase Plan, as amended (“2010 ESPP”) allows employees to purchase shares of the 
Company’s common stock through payroll deductions of up to 15 percent of their annual compensation subject to certain Internal Revenue 
Code limitations. In addition, no participant may purchase more than 2,000 shares of common stock in each offering period. 

The offering periods under the 2010 ESPP are six-month periods commencing on June 1 and December 1 of each year. The price of 

common stock purchased under the plan is 85 percent of the lower of the fair market value of the common stock on the commencement date 
and exercise date of each six-month offering period.

At the 2012 Annual Meeting of Stockholders, stockholders approved an amendment to the Company's 2010 ESPP to increase the 

number of shares of common stock reserved for issuance from 1,000,000 shares to 4,300,000 shares. During the twelve months ended 
December 31, 2012, 619,000 shares were purchased and issued. As of December 31, 2012, there were 3,259,596 shares available for 
issuance.

Stock Based Compensation

In accordance with ASC Topic 718, stock-based compensation expense associated with stock options, RSUs, PRSUs, RSAs, and 
purchase rights under the 2010 ESPP is measured at the grant date based on the fair value of the award, and is recognized, net of forfeitures, 
as expense over the remaining requisite service period on a straight-line basis. During the years ended December 31, 2012, 2011, and 2010, 
the Company recorded stock-based compensation expense of $17.4 million, $21.6 million and $25.6 million, respectively. 

71

The following table summarizes the weighted-average grant date fair values of the Company's stock-based awards granted in the 

periods indicated:

Stock options
RSUs
PRSUs
RSAs
ESPP

Years Ended December 31,
2011

2010

2012

$
$
$

$

4.68
6.55
14.81

N/A

2.34

$
$

$
$

9.77
21.33

N/A

21.67
3.48

$
$

$

6.50
11.12

N/A
N/A

4.20

The Company values the RSUs and RSAs at the closing market price of the Company’s common stock on the date of grant.

The fair value of the PRSU with a market condition is estimated on the date of award, using a Monte Carlo simulation model to 

estimate the TSR of the Company's stock in relation to the peer group over each performance period. Compensation cost on PRSUs with a 
market condition is not adjusted for subsequent changes in the Company's stock performance or the level of ultimate vesting.

The Company estimates the fair value of stock options and purchase rights under the 2010 ESPP at the grant date using the Black-

Scholes option-pricing model. This model requires the use of the following assumptions: 

(i) Expected volatility of the Company's common stock - Starting in the fourth quarter of 2012, the Company computed its expected 
volatility assumption based on a blended volatility (50% historical volatility and 50% implied volatility from traded options on the 
Company's common stock). This change of the method was made as the Company's common stock has now been publicly traded 
for more than two years, a sufficient history of stock prices had been developed. The selection of a blended volatility assumption 
was based upon the Company's assessment that a blended volatility is more representative of the Company's future stock price trend 
as it weighs the historical volatility with the future implied volatility. Expected volatilities computed using this new method for 
stock options granted in the fourth quarter of 2012 was 66%. Prior to the fourth quarter of 2012, the Company’s computation of 
expected volatility was based on the Company’s peer group in the industry in which the Company does business. Expected 
volatilities computed using the old method for stock options granted in the first three quarters of 2012 ranged from 55% to 56%.

(ii) Expected life of the option award - Represents the weighted-average period that the stock options are expected to remain 
outstanding. The Company’s computation of expected life utilizes the simplified method in accordance with Staff Accounting 
Bulletin No. 110 ("SAB 110") due to the lack of sufficient historical exercise data to provide a reasonable basis upon which to 
estimate expected term. The mid-point between the vesting date and the expiration date is used as the expected term under this 
method. 

(iii) Expected dividend yield - Assumption is based on the Company's history of not paying dividends and no future expectations of 
dividend payouts.

(iv) Risk-free interest rate - Based on the U.S. Treasury yield curve in effect at the time of grant with maturities approximating the 
grant’s expected life. 

The following table summarizes the weighted-average assumptions used in estimating the grant-date fair value of stock options and of 

each employee’s purchase right under the 2010 ESPP in the periods indicated:

Stock Options
Expected volatility
Expected life (years)
Expected dividend yield
Risk-free interest rate

ESPP
Expected volatility
Expected life (years)
Expected dividend yield
Risk-free interest rate

2012

Years Ended December 31,
2011

2010

56%
6.25
—
1.06%

52%
6.25
—
2.11%

2012

Years Ended December 31,
2011

2010

63%
0.50
—
0.13%

52%
0.50
—
0.66%

53%
6.25
—
2.03%

55%
0.50
—
1.20%

In addition, the Company applies an estimated forfeiture rate to awards granted and records stock-based compensation expense only 
for those awards that are expected to vest. Forfeiture rates are estimated at the time of grant based on the Company's historical experience. 
Further, to the extent the Company's actual forfeiture rate is different from management's estimate, stock-based compensation is adjusted 
accordingly.

On February 22, 2011, in connection with the acquisition of Occam (see Note 2, "Business Combinations" of the Notes to Consolidated 

Financial Statements in this Form 10-K), the Company issued 536,190 stock options and 42,654 RSUs to certain Occam employees. The 
grants were in exchange for certain options and RSUs that were held by Occam employees prior to the acquisition which retained the original 
vesting schedule of the initial Occam grants, except for certain equity awards held by Occam executives that were accelerated in association 

72

with their severance agreements. The Company estimated the fair value of $5.8 million of the options and RSUs in accordance with ASC 
Topic 718. In accordance with ASC Topic 805, the Company allocated the value of $1.4 million of certain options and RSUs to consideration 
in the business combination with the remaining value of $4.5 million allocated to post-combination expense to be recognized over the 
remaining service period of the grants.

As of December 31, 2012, unrecognized stock-based compensation expenses by award type, net of estimated forfeitures, and their 

expected weighted-average recognition periods are summarized in the following table (in thousands).

Unrecognized stock-based compensation expense
Weighted-average amortization period (in years)

Stock Option
7,651
$
2.6

$

Common Stock Warrants

RSU
15,260
2.2

As of December 31, 2012
PRSU

RSA

ESPP

$

$

1,503
1.4

$

5,265
2.6

740
0.4

Warrants to purchase convertible preferred stock that did not expire at the close of the Company’s initial public offering, in March 

2010, converted to warrants to purchase common stock at the applicable conversion rate for the related preferred stock. As of December 31, 
2012, the following warrants to purchase common stock were outstanding (in thousands, except per share data):

Expiration Date
August 16, 2014
September 4, 2017

Exercise Price
Per Share

Number of Warrants
Outstanding

   $
   $

7.89   
16.56

8
15
23

Shares Reserved for Future Issuance

The Company had common shares reserved for future issuance as follows (in thousands):

Stock options outstanding
Restricted stock units outstanding
Performance restricted stock units outstanding
Shares available for future grant under 2010 Plan
Shares available for future issuance under ESPP
Common stock warrants

Total

2012

As of December 31,
2011

2010

2,213
1,762
183
3,959
3,260
23
11,400

1,661
1,775
—
4,508
579
23
8,546

735
3,426
—
5,061
1,000
65
10,287

9.  Employee Benefit Plan

The Company sponsors a 401(k) tax-deferred savings plan for all employees who meet certain eligibility requirements. Participants 

may contribute, on a pre-tax basis, a percentage of their annual compensation, but not to exceed a maximum contribution amount pursuant to 
Section 401(k) of the Internal Revenue Code. The Company, at the discretion of the board of directors, may make additional matching 
contributions on behalf of the participants. The Company made matching contributions totaling $1.4 million, $1.3 million, and $0.7 million in 
2012, 2011 and 2010.

10.  Credit Facility

The Company has a revolving credit facility of $30.0 million based upon a percentage of eligible accounts receivable. Included in the 

revolving line are amounts available under letters of credit and cash management services. The Company had outstanding letters of credit 
totaling $3.3 million and $2.8 million as of December 31, 2012 and December 31, 2011, respectively. There were no outstanding borrowings 
under the revolving credit facility as of December 31, 2012 and December 31, 2011. As of December 31, 2012, there was approximately 
$26.7 million available for borrowing under this revolving credit facility. The Company is also required to pay commitment fees of 0.25% per 
year on any unused portions of the facility. As of December 31, 2012 and December 31, 2011, the Company was in compliance with its 
financial covenants under the credit facility. The revolving credit facility matures on June 30, 2013.

11.  Income Taxes

The Company recorded a provision for income taxes of $0.2 million, $0.2 million, and $0.1 million, in 2012, 2011, and 2010, 
respectively.  The income tax provision for 2012 primarily consisted of federal alternative minimum tax and state and foreign income taxes. 
Related to the bargain purchase of EFAA during the year, the Company established a deferred tax liability in the opening balance sheet. The 
bargain purchase gain is presented net of tax in the Company's 2012 Consolidated Statements of Comprehensive Loss. The deferred tax 
liability was offset against the Company's deferred tax assets subsequent to the date of acquisition. Given that the Company has a full 

73

  
  
  
  
valuation allowance against its deferred tax assets, the valuation allowance related to this offsetting amount was released resulting in a tax 
benefit of $0.6 million, which partially offset the tax provision during 2012.

Provision for income taxes consisted of the following for the periods indicated (in thousands):

Federal current income tax
State current income tax
Foreign current income tax
Federal deferred income tax (benefit)
State deferred income tax (benefit)
Foreign deferred income tax (benefit)

Provision for income taxes

Years Ended December 31,
2011

2010

2012

$

$

152
73
440
(474)
(89)
56
158

$

$

— $
114
228
—
—
(118)
224

$

(8)
46
43
—
—
—
81

The differences between the statutory tax rate and the effective tax rate, expressed as a percentage of loss before provision for income 

taxes, were as follows:

Federal statutory rate
State statutory rate
Foreign operations
R&D tax credits
Release of valuation allowance related to EFAA acquisition
Acquisition-related costs
Tax attribute true-up from tax studies
Other permanent items
Valuation allowance
Effective tax rate

Years Ended December 31,
2011

2010

2012

34.0 %
5.2 %
0.1 %
2.5 %
2.0 %
1.2 %
— %
0.1 %
(45.7)%
(0.6)%

34.0 %
5.2 %
0.2 %
2.1 %
— %
(1.5)%
— %
(1.6)%
(38.8)%
(0.4)%

34.0 %
6.5 %
— %
4.7 %
— %
(7.2)%
(28.7)%
(1.4)%
(8.3)%
(0.4)%

The significant components of the Company’s deferred tax assets and liabilities were as follows (in thousands):

$

Deferred tax assets:

Net operating loss carryforwards
Tax credit carryforwards
Depreciation and amortization
Accruals and reserves
Deferred revenue
Stock-based compensation
Other

Gross deferred tax assets

Valuation allowance

Net deferred tax assets

Deferred tax liabilities:
Intangible assets

Net deferred tax assets reflected in balance sheet

$

As of December 31,

2012

2011

$

180,005
20,154
2,858
11,353
13,367
3,592
294
231,623
(207,441)
24,182

182,674
19,076
3,619
14,057
8,804
4,734
118
233,082
(202,004)
31,078

(24,120)
62

$

(30,960)
118

Management reviews the recognition of deferred tax assets to determine if realization of such assets is more likely than not. The 
realization of the Company's deferred tax assets is dependent upon future earnings. The Company has been in a cumulative loss position since 
inception, which represents a significant piece of negative evidence. Using the more likely than not criteria specified in the applicable 
accounting guidance, this negative evidence cannot be overcome by positive evidence currently available to the Company and as a result the 
Company has established a full valuation allowance against its deferred tax assets with the exception of certain foreign deferred tax assets. 
The Company’s valuation allowance increased by $5.4 million and $22.8 million in the years ended December 31, 2012 and 2011, 
respectively. The valuation allowance in both 2012 and 2011 include $0.1 million related to excess tax benefits of stock option deductions 
prior to the adoption of ASC Topic 718. The benefits will increase additional paid-in capital when realized.

74

As of December 31, 2012, the Company had U.S. federal and state net operating losses of approximately $554.7 million and $318.7 

million. The U.S. federal net operating loss carryforwards will expire at various dates beginning in 2018 and through 2032 if not utilized. The 
state net operating loss carryforwards will expire at various dates beginning in 2013 and through 2032, if not utilized. In addition, as of 
December 31, 2012 and 2011, the Company had $36.3 million and $35.3 million in federal deductions, respectively, and $33.3 million and 
$32.4 million in state deductions, respectively, related to excess tax benefits from stock options which are not included in the net operating 
loss carryforward amounts in the table above since they have not met the realization criteria of ASC Topic 718. The tax benefits from these 
deductions will increase additional paid-in capital when realized. Additionally, the Company has U.S. federal, California and other various 
U.S. states research and development credits of approximately $15.9 million, $20.3 million and $1.7 million as of December 31, 2012, 
respectively. The U.S. federal research and development credits will begin to expire in 2020 and through 2032, and the California research 
and development credits have no expiration date. The credits related to other various U.S. states will begin to expire in 2015 and through 
2027. During the year ended December 31, 2010, the Company performed a Section 382 study of the Internal Revenue Code (and similar 
state provisions), and a research and development credit study, and adjusted its deferred tax assets related to its net operating loss 
carryforwards and its research and development credits accordingly.

Uncertain Tax Positions

ASC Topic 740, "Income Taxes," prescribes a recognition threshold and measurement attribute to the financial statement recognition 

and measurement of a tax position taken or expected to be taken in a tax return. The guidance also provides guidance on derecognition, 
classification, accounting in interim periods and disclosure requirements for uncertain tax positions. The standard requires the Company to 
recognize the financial statement effects of an uncertain tax position when it is more likely than not that such position will be sustained upon 
audit. The Company recognizes accrued interest and penalties related to unrecognized tax benefits as interest expense and income tax 
expense, respectively, in statements of operations. 

The following table reconciles the Company's unrecognized tax benefits for the years ended December 31, 2012 and 2011 (in 

thousands):

Balance as of January 1

    Additions for tax positions related to prior year
    Reductions for tax positions related to prior year
    Additions for tax positions related to current year
    Additions for tax positions related to acquisition

Balance as of December 31

As of December 31,

2012

2011

12,543
228
(37)
504
—
13,238

$

$

7,801
—
(86)
663
4,165
12,543

$

$

The total amount of unrecognized tax benefits that would affect the Company's effective tax rate is $0.1 million and $0.1 million as of 
December 31, 2012 and December 31, 2011, respectively. The amount of accrued interest and penalties included in the liability for uncertain 
income taxes as of December 31, 2012 is immaterial. 

The Company files tax returns in the United States and various state jurisdictions, the United Kingdom, and China. The tax years 1997 

through 2012 remain open and subject to examination by the appropriate governmental agencies in the U.S. due to tax carryforward 
attributes. 

12.  Segment Information

ASC Topic 280, "Segment Reporting," establishes standards for reporting information about operating segments. The guidance requires 

disclosures of certain information regarding operating segments, products and services, geographic areas of operation and major customers. 
Segment reporting is based upon the management approach, i.e. how management organizes the Company’s operating segments for which 
separate financial information is (1) available, and (2) evaluated regularly by the chief operating decision maker in deciding how to allocate 
resources and in assessing performance. The Company’s chief operating decision maker is the Company’s Chief Executive Officer . 

The Company’s Chief Executive Officer  reviews financial information presented on a Company-wide basis, accompanied by 
disaggregated information about revenues by geographic region for purposes of allocating resources and evaluating financial performance. 
The Company develops, markets and sells communications access systems and software, and there are no segment managers who are held 
accountable for operations, operating results and plans for levels or components below the Company unit level. Accordingly, the Company is 
considered to be in a single reporting segment and operating unit structure. 

75

Geographic Information:

The following is a summary of revenues by geographic region based upon the location to which the product was shipped (in 

thousands):

United States
Canada
Caribbean
Other
Total

2012

Years Ended December 31,
2011

2010

$

$

306,003
10,894
9,343
3,978
330,218

$

$

323,070
6,691
12,837
2,071
344,669

$

$

244,538
1,650
40,812
43
287,043

The Company's property and equipment, net of accumulated depreciation, are located in the following geographical areas (in 

thousands):

United States
China
Total

2012

18,390
2,693
21,083

$

$

As of December 31,
2011

$

$

14,339
1,791
16,130

2010

10,970
845
11,815

$

$

13. Quarterly Financial Data—Unaudited

The Company's fiscal year begins on January 1st and ends on December 31st. Quarterly periods are based on a 4-4-5 fiscal calendar 

with the first, second and third fiscal quarters ending on the 13th Saturday of each fiscal period. As a result, the Company had six more days 
in the first quarter of 2012 and five less days in the fourth quarter of 2012 than in the respective 2011 periods. 

The following table presents selected unaudited quarterly financial data of the Company (in thousands, except per share data). The 

Company’s quarterly results of operations for these periods are not necessarily indicative of future results of operations.

Revenue
Gross profit
Operating loss
Net loss
Net loss attributable to common stockholders
Basic and diluted net loss per common share

Revenue
Gross profit
Operating loss
Net loss
Net loss attributable to common stockholders
Basic and diluted net loss per common share

March 31

78,565
33,819
(7,369)
(7,521)
(7,521)
(0.16)

March 26

71,470
20,389
(22,734)
(22,756)
(22,756)
(0.55)

$

$

$

$

$

June 30

Fiscal Year 2012 Quarter Ended
September 29
81,301
$
33,506
(7,077)
(7,140)
(7,140)
(0.15)

78,928
33,221
(6,830)
(7,091)
(7,091)
(0.15)

$

$

$

June 25

Fiscal Year 2011 Quarter Ended
September 24
83,655
$
31,847
(6,894)
(6,934)
(6,934)
(0.15)

97,959
30,163
(17,537)
(17,646)
(17,646)
(0.38)

$

$

December 31
91,424
$
37,030
(7,748)
(6,574)
(6,574)
(0.14)

$

December 31
91,585
$
37,054
(5,156)
(5,214)
(5,214)
(0.11)

$

14. Subsequent Event

On January 28, 2013, the Company entered into an amendment to its lease agreement (the "Amendment") for its primary office space 
in Petaluma, California, to extend the lease term from February 2014 to February 2019 under a new base rent schedule effective February 1, 
2013. The total minimum future payment commitment under this Amendment is approximately $5.6 million. The Company will receive a 
lease incentive consisting of $0.4 million in leasehold improvements provided by the lessor. 

ITEM 9.  

Changes in and Disagreements with Accountants on Accounting and Financial Disclosure.

During the fiscal years ended December 31, 2012, 2011 and 2010, there were no changes in accountants nor any disagreements with 

accountants on accounting and financial disclosure.

76

ITEM 9A. 

Controls and Procedures

Evaluation of Disclosure Controls and Procedures

As of the end of the period covered by this report, which we refer to as the evaluation date, we carried out an evaluation under the 

supervision and with the participation of management, including our Chief Executive Officer and Chief Financial Officer, of our disclosure 
controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended).

The purpose of this evaluation was to determine whether as of the evaluation date our disclosure controls and procedures were 

effective to provide reasonable assurance that the information we are required to disclose in our filings with the Securities and Exchange 
Commission, (i) is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms and 
(ii) accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to 
allow timely decisions regarding required disclosure. Based upon this evaluation, our Chief Executive Officer and Chief Financial Officer 
concluded that our disclosure controls and procedures were effective as of the end of the period covered by this report.

Management’s Report on Internal Control Over Financial Reporting

Management is responsible for establishing and maintaining adequate internal control over financial reporting. Our internal control 
over financial reporting is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of 
financial statements for external purposes in accordance with generally accepted accounting principles. Because of its inherent limitations, 
internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future 
periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with 
the policies or procedures may deteriorate. Management has evaluated the effectiveness of our internal control over financial reporting as of 
December 31, 2012 using the criteria set forth in the Internal Control—Integrated Framework issued by the Committee of Sponsoring 
Organizations of the Treadway Commission ("COSO"). Based on our evaluation, management has concluded that we maintained effective 
control over financial reporting as of December 31, 2012 based on the COSO criteria. The effectiveness of our internal control over financial 
reporting as of December 31, 2012 has been audited by Ernst & Young, LLP, an independent registered public accounting firm, as stated in 
their report included in this Annual Report on Form 10-K.

Limitations on the Effectiveness of Controls

Our disclosure controls and procedures provide our Chief Executive Officer and Chief Financial Officer reasonable assurances that our 
disclosure controls and procedures will achieve their objectives. However, our management, including our Chief Executive Officer and Chief 
Financial Officer, does not expect that our disclosure controls and procedures or our internal control over financial reporting can or will 
prevent all human error. A control system, no matter how well designed and implemented, can provide only reasonable, not absolute, 
assurance that the objectives of the control system are met. Furthermore, the design of a control system must reflect the fact that there are 
internal resource constraints, and the benefit of controls must be weighed relative to their corresponding costs. Because of the limitations in 
all control systems, no evaluation of controls can provide complete assurance that all control issues and instances of error, if any, within our 
company are detected. These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns 
can occur due to human error or mistake. Additionally, controls, no matter how well designed, could be circumvented by the individual acts 
of specific persons within the organization. The design of any system of controls is also based in part upon certain assumptions about the 
likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated objectives under all potential 
future conditions.

Changes in Internal Control over Financial Reporting

There was no change in our internal control over financial reporting identified in connection with the evaluation required by Rule 

13a-15(d) and 15d-15(d) of the Exchange Act that occurred during the period covered by this report that has materially affected, or is 
reasonably likely to materially affect, our internal control over financial reporting.

77

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of Calix Inc. and subsidiaries

We have audited Calix, Inc. and subsidiaries' internal control over financial reporting as of December 31, 2012, based on criteria 

established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission 
(the COSO criteria). Calix, Inc. and subsidiaries' management is responsible for maintaining effective internal control over financial 
reporting, and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management's 
Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the company's internal control over 
financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those 

standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial 
reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, 
assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on 
the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a 
reasonable basis for our opinion.

A company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of 

financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting 
principles. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of 
records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide 
reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally 
accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of 
management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized 
acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections 

of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in 
conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, Calix, Inc. and subsidiaries maintained, in all material respects, effective internal control over financial reporting as of 

December 31, 2012, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the 

consolidated balance sheets of Calix, Inc. and subsidiaries as of December 31, 2012 and 2011, and the related consolidated statements of 
comprehensive loss, convertible preferred stock and stockholders' equity, and cash flows for each of the three years in the period ended 
December 31, 2012, and its financial statement schedule listed in the index at Item 15(a), and our report dated February 21, 2013 expressed 
an unqualified opinion thereon.

/s/ ERNST & YOUNG LLP

San Francisco, California
February 21, 2013 

78

 
ITEM 9B. 

Other Information.

None.

PART III

ITEM 10. 

Directors, Executive Officers and Corporate Governance.

Information required by this Item 10 relating to our directors is incorporated herein by reference to the information set forth under the 
captions “Proposal No. 1—Election of Directors” and “Director Compensation” and in other applicable sections of the Proxy Statement for 
the 2013 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission pursuant to Regulation 14A of the 
Exchange Act, or the Proxy Statement, to be filed within 120 days of the end of the fiscal year covered by this Report. Information required 
by this Item 10 relating to our officers is incorporated herein by reference to the information set forth under the captions “Executive Officers” 
and “Executive Compensation” and in other applicable sections of the Proxy Statement. Information regarding our Section 16 reporting 
compliance is incorporated herein by reference to the information set forth under the captions “Security Ownership of Certain Beneficial 
Owners and Management” and “Section 16(a) Beneficial Ownership Reporting Compliance” of the Proxy Statement.

We have adopted a code of ethics, which applies to all employees, officers and directors of Calix. The Code of Business Conduct and 

Ethics meets the requirements of a “code of ethics” as defined by Item 406 of Regulation S-K, and applies to our Chief Executive Officer, 
Chief Financial Officer (who is both our principal financial and principal accounting officer), as well as all other employees, as indicated 
above. The Code of Business Conduct and Ethics also meets the requirements of a code of conduct under NYSE listing standards. The Code 
of Business Conduct and Ethics is posted on our website at www.calix.com under the links “About Calix—Investor Relations—Corporate 
Governance—Code of Conduct". We intend to disclose any amendments to the Code of Business Conduct and Ethics, as well as any waivers 
for executive officers or directors, on our website at www.calix.com.

ITEM 11. 

Executive Compensation.

Information required by this Item 11 relating to executive compensation and other matters is incorporated herein by reference to the 

information set forth under the caption “Compensation Discussion and Analysis” and in other applicable sections of the Proxy Statement.

ITEM 12. 

Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

Information required by this Item 12 relating to security ownership of certain beneficial owners and management and related 

stockholder matters is incorporated herein by reference to the information set forth under the caption “Security Ownership of Certain 
Beneficial Owners and Management” and in other applicable sections of the Proxy Statement. Information regarding securities authorized for 
issuance under our equity compensation plans is incorporated herein by reference to the information set forth under the caption “Equity 
Compensation Plan Information” of the Proxy Statement.

ITEM 13. 

Certain Relationships and Related Transactions, and Director Independence.

Information required by this Item 13 relating to certain relationships and related transactions and director independence is incorporated 

herein by reference to the information set forth under the caption “Certain Relationships and Related Transactions” and in other applicable 
sections of the Proxy Statement.

ITEM 14. 

Principal Accountant Fees and Services.

Information required by this Item 14 relating to principal account fees and services is incorporated herein by reference to the 

information set forth under the caption “Principal Accountant Fees and Services” of the Proxy Statement.

79

PART IV

ITEM 15. 

Exhibits, Financial Statement Schedules.

(a) The following documents are filed as part of this Report:

1. Consolidated Financial Statements

The consolidated financial statements of Calix and the report of independent registered public accounting firm thereon are set forth 

under Part II, Item 8 of this report.

Report of Independent Registered Public Accounting Firm

Consolidated Balance Sheets, As of December 31, 2012 and 2011

Consolidated Statements of Comprehensive Loss, Years Ended December 31, 2012, 2011 and 2010

Consolidated Statements of Convertible Preferred Stock and Stockholders’ Equity, Years Ended 
December 31, 2012, 2011 and 2010

Consolidated Statements of Cash Flows, Years Ended December 31, 2012, 2011 and 2010

Notes to Consolidated Financial Statements

2. Consolidated Financial Statement Schedules

The following Financial Statement Schedule is filed as part of this Report:

Schedule II – Valuation and Qualifying Accounts

51

52

53

54

55

56

84

Schedules not listed above have been omitted because they are not applicable or are not required or the information required to be set 

forth therein is included in the consolidated financial statements and notes thereto.

3. Exhibits.

The following exhibits are filed with or incorporated by reference in this report. Where such filing is made by incorporation by 

reference to a previously filed registration statement or report, such registration statement or report is identified in parentheses. We will 
furnish any exhibit upon request to: Calix Investor Relations, David Allen at david.allen@calix.com. 

Exhibit
Number

2.1

2.2

3.1

3.2

4.1

4.2

4.3

Description

Agreement and Plan of Merger and Reorganization, dated as of September 16, 2010, by and among Calix, Inc., Ocean Sub
I, Inc., Ocean Sub II, LLC, Occam Networks, Inc. (filed as Exhibit 2.1 to Calix’s Registration Statement on Form S-4
originally filed with the Securities and Exchange Commission on November 2, 2010 (File No. 333-170282), as amended by
Amendment No. 1 filed December 14, 2010, as amended by Post-Effective Amendment No. 1, filed December 14, 2010
and as amended by Post-Effective Amendment No. 2, filed February 7, 2011 and incorporated by reference herein).

Support Agreement, dated September 16, 2010, by and among Calix, Inc., Ocean Sub I, Inc., Ocean Sub II, LLC and certain
stockholders of Occam Networks, Inc. (filed as Exhibit 2.2 to Calix’s Registration Statement on Form S-4 originally filed
with the Securities and Exchange Commission on November 2, 2010 (File No. 333-170282), as amended by Amendment
No. 1 filed December 14, 2010, as amended by Post-Effective Amendment No. 1, filed December 14, 2010 and as amended
by Post-Effective Amendment No. 2, filed February 7, 2011 and incorporated by reference herein).

Amended and Restated Certificate of Incorporation of Calix, Inc. (filed as Exhibit 3.3 to Amendment No. 7 to Calix’s
Registration Statement on Form S-1 filed with the Securities and Exchange Commission on March 23, 2010 (File No.
333-163252) and incorporated by reference herein).

Amended and Restated Bylaws of Calix, Inc. (filed as Exhibit 3.5 to Amendment No. 7 to Calix’s Registration Statement on
Form S-1 filed with the Securities and Exchange Commission on March 23, 2010 (File No. 333-163252) and incorporated
by reference herein).

Form of Calix, Inc.’s Common Stock Certificate (filed as Exhibit 4.1 to Amendment No. 7 to Calix’s Registration Statement
on Form S-1 filed with the Securities and Exchange Commission on March 23, 2010 (File No. 333-163252) and
incorporated by reference herein).

Amended and Restated Investors’ Rights Agreement, by and between Calix, Inc. and the investors listed on Exhibit A
thereto, dated May 29, 2009 (filed as Exhibit 4.2 to Calix’s Registration Statement on Form S-1 filed with the SEC on
November 20, 2009 (File No. 333-163252) and incorporated by reference herein).

Warrant to Purchase Stock, between Optical Solutions, Inc. and Silicon Valley Bank, dated August 16, 2004 (filed as
Exhibit 4.22 to Calix’s Registration Statement on Form S-1 filed with the SEC on November 20, 2009 (File No.
333-163252) and incorporated by reference herein).

80

Exhibit
Number

4.4

4.5

10.1*

10.2*

10.3*

10.4*

10.5

10.6

10.7

10.8*

10.9*

10.10*

10.11*

10.12*

10.13*

10.14*

10.15*

10.16

10.17*

10.18*

10.19*

10.20†

Description

Assignment, between Silicon Valley Bank and Silicon Valley Bancshares, dated August 19, 2004 (filed as Exhibit 4.23 to
Calix’s Registration Statement on Form S-1 filed with the SEC on November 20, 2009 (File No. 333-163252) and
incorporated by reference herein).

Warrant to Purchase Stock, between Calix, Inc. and Greater Bay Venture Banking, a division of Greater Bay Bank N.A.,
dated September 4, 2007 (filed as Exhibit 4.27 to Calix’s Registration Statement on Form S-1 filed with the SEC on
November 20, 2009 (File No. 333-163252) and incorporated by reference herein).

Calix Networks, Inc. Amended and Restated 2000 Stock Plan and related documents (filed as Exhibit 10.1 to Calix’s
Registration Statement on Form S-1 filed with the SEC on November 20, 2009 (File No. 333-163252) and incorporated by
reference herein).

Calix Networks, Inc. Amended and Restated 2002 Stock Plan and related documents (filed as Exhibit 10.2 to Amendment
No. 6 to Calix’s Registration Statement on Form S-1 filed with the SEC on March 8, 2010 (File No. 333-163252) and
incorporated by reference herein).

Optical Solutions, Inc. Amended and Restated 1997 Long-Term Incentive and Stock Option Plan and related documents
(filed as Exhibit 10.3 to Calix’s Registration Statement on Form S-1 filed with the SEC on November 20, 2009 (File No.
333-163252) and incorporated by reference herein).

Calix, Inc. 2010 Equity Incentive Award Plan and related documents (filed as Exhibit 10.2 to Amendment No. 6 to Calix’s
Registration Statement on Form S-1 filed with the SEC on March 8, 2010 (File No. 333-163252) and incorporated by
reference herein).

Form of Indemnification Agreement made by and between Calix, Inc. and each of its directors, executive officers and some
employees (filed as Exhibit 10.5 to Amendment No. 6 to Calix’s Registration Statement on Form S-1 filed with the SEC on
March 8, 2010 (File No. 333-163252) and incorporated by reference herein).

Lease, between RNM Lakeville, LLC and Calix, Inc., dated February 13, 2009 (filed as Exhibit 10.6 to Calix’s Registration
Statement on Form S-1 filed with the SEC on November 20, 2009 (File No. 333-163252) and incorporated by reference
herein).

Amended and Restated Loan and Security Agreement, by and between Calix, Inc. and Silicon Valley Bank, dated August
21, 2009 (filed as Exhibit 10.7 to Calix’s Registration Statement on Form S-1 filed with the SEC on November 20, 2009
(File No. 333-163252) and incorporated by reference herein).

Offer Letter, between Calix, Inc. and Carl Russo, dated November 1, 2006 (filed as Exhibit 10.8 to Amendment No. 1 to
Calix’s Registration Statement on Form S-1 filed with the SEC on December 31, 2009 (File No. 333-163252) and
incorporated by reference herein).

Offer Letter, between Calix, Inc. and Kelyn Brannon-Ahn, dated April 2, 2008 (filed as Exhibit 10.9 to Amendment No. 1
to Calix’s Registration Statement on Form S-1 filed with the SEC on December 31, 2009 (File No. 333-163252) and
incorporated by reference herein).

Offer Letter, between Calix, Inc. and Tony Banta, dated August 25, 2005 (filed as Exhibit 10.10 to Amendment No. 1 to
Calix’s Registration Statement on Form S-1 filed with the SEC on December 31, 2009 (File No. 333-163252) and
incorporated by reference herein).

Offer Letter, between Calix, Inc. and John Colvin, dated March 3, 2004 (filed as Exhibit 10.11 to Amendment No. 1 to
Calix’s Registration Statement on Form S-1 filed with the SEC on December 31, 2009 (File No. 333-163252) and
incorporated by reference herein).

Offer Letter, between Calix, Inc. and Kevin Pope, dated December 21, 2008 (filed as Exhibit 10.12 to Amendment No. 1 to
Calix’s Registration Statement on Form S-1 filed with the SEC on December 31, 2009 (File No. 333-163252) and
incorporated by reference herein).

Offer Letter, between Calix, Inc. and Roger Weingarth, dated February 17, 2003, as amended April 13, 2004 (filed as
Exhibit 10.13 to Amendment No. 1 to Calix’s Registration Statement on Form S-1 filed with the SEC on December 31,
2009 (File No. 333-163252) and incorporated by reference herein).

Offer Letter, between Calix, Inc. and Michael Ashby, dated March 7, 2011 (filed as Exhibit 10.2 to Calix’s Form 8-K filed
with the SEC on March 7, 2011 (File No. 001-34674) and incorporated by reference herein).

Separation Agreement and General Release of All Claims, between Calix, Inc. and Kelyn Brannon, dated March 7, 2011
(filed as Exhibit 10.1 to Calix’s Form 8-K filed with the SEC on March 7, 2011 (File No. 001-34674) and incorporated by
reference herein).

Amendment No. 1 to Amended and Restated Loan and Security Agreement, between Silicon Valley Bank and Calix, Inc.,
dated March 8, 2010 (filed as Exhibit 10.17 to Amendment No. 7 to Calix’s Registration Statement on Form S-1 filed with
the Securities and Exchange Commission on March 23, 2010 (File No. 333-163252) and incorporated by reference herein).

Employment Agreement, between Calix, Inc. and Andrew Lockhart, dated February 2, 2011 (filed as Exhibit 10.20 to 
Calix's Form 10-Q filed with the SEC on May 3, 2012 (File No. 001-34674) and incorporated by reference herein).

Calix, Inc. Amended And Restated Employee Stock Purchase Plan (Effective as of May 23, 2012)  (filed as Exhibit 10.1 to
Calix’s Form 10-Q filed with the SEC on August 7, 2012 (File No. 001-34674) and incorporated by reference herein).

Calix, Inc. Non-Employee Director Equity Compensation Policy, as amended October 18, 2011 and July 25, 2012 (filed as
Exhibit 10.2 to Calix’s Form 10-Q filed with the SEC on August 7, 2012 (File No. 001-34674) and incorporated by
reference herein).

Asset Purchase Agreement between Ericsson Inc. and Calix, Inc., dated August 20, 2012 (filed as Exhibit 10.1 to Calix’s
Form 10-Q/A filed with the SEC on December 18, 2012 (File No. 001-34674) and incorporated by reference herein).

81

Exhibit
Number

10.21*

10.22*

10.23*

10.24*

10.25

10.26*

21.1

23.1

24.1

31.1

31.2

32.1

Description

Calix, Inc. Non-Employee Director Cash Compensation Policy, effective January 1, 2012 (filed as Exhibit 10.2 to Calix’s
Form 10-Q filed with the SEC on November 2, 2012 (File No. 001-34674) and incorporated by reference herein).

Calix, Inc. Non-Employee Director Restricted Stock Unit Deferred Compensation Plan, effective January 1, 2013.

Calix, Inc. Management Bonus Program Under the 2010 Equity Incentive Award Plan (filed as Exhibit 10.1 to Calix's Form 
8-K filed with the SEC on February 28, 2012 (File No. 001-34674) and incorporated by reference herein).
Calix, Inc. Long Term Incentive Program Under the 2010 Equity Incentive Award Plan (filed as Exhibit 10.2 to Calix's 
Form 8-K filed with the SEC on February 28, 2012 (File No. 001-34674) and incorporated by reference herein).
First Amendment to Lease, by and between 1031, 1035, 1039 North McDowell, LLC and Calix, Inc., effective January 28, 
2013.
Transition and Separation Agreement, by and between Roger Weingarth and Calix, Inc., dated February 6, 2013.

Subsidiaries of the Registrant.

Consent of Ernst & Young LLP, independent registered public accounting firm.

Power of Attorney (included on signature page to this Annual Report on Form 10-K).

Certification of Chief Executive Officer of Calix, Inc. Pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934.

Certification of Chief Financial Officer of Calix, Inc. Pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934.

Certification of Chief Executive Officer and Chief Financial Officer of Calix, Inc. Pursuant to 18 U.S.C. Section 1350, as
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

101.INS **

XBRL Instance Document.

101.SCH **

XBRL Taxonomy Extension Schema Document.

101.CAL **

XBRL Taxonomy Extension Calculation Linkbase Document.

101.DEF **

XBRL Taxonomy Extension Definition Linkbase Document.

101.LAB **

XBRL Taxonomy Extension Label Linkbase Document.

101.PRE **

XBRL Taxonomy Extension Presentation Linkbase Document.

*

†

**

Indicates management compensatory plan, contract or arrangement.

Confidential treatment has been granted as to certain portions of this agreement.

In accordance with Rule 406T of Regulation S-T, the XBRL information is furnished and not filed herewith, is not a part of a
registration statement or Prospectus for purposes of sections 11 or 12 of the Securities Act of 1933, is deemed not filed for purposes
of section 18 of the Securities Exchange Act of 1934, and otherwise is not subject to liability under these sections.

82

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its 

behalf by the undersigned thereunto duly authorized.

SIGNATURES

Dated:  February 21, 2013

Dated:  February 21, 2013

CALIX, INC.
(Registrant)

By:

/s/    Carl Russo        

Carl Russo

Chief Executive Officer
(Principal Executive Officer)

By:

/s/    Michael Ashby        

Michael Ashby

Chief Financial Officer
(Principal Financial Officer)

POWER OF ATTORNEY

Each person whose individual signature appears below hereby authorizes and appoints Carl Russo and Michael Ashby, and each of 
them, with full power of substitution and resubstitution and full power to act without the other, as his true and lawful attorney-in-fact and 
agent to act in his name, place and stead and to execute in the name and on behalf of each person, individually and in each capacity stated 
below, and to file any and all amendments to this Annual Report on Form 10-K, and to file the same, with all exhibits thereto, and other 
documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each 
of them, full power and authority to do and perform each and every act and thing, ratifying and confirming all that said attorneys-in-fact and 
agents or any of them or their or his substitute or substitutes may lawfully do or cause to be done by virtue thereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on 

behalf of the registrant and in the capacities indicated on February 21, 2013.

Signature

/s/ Carl Russo
Carl Russo

/s/ Michael Ashby
Michael Ashby

/s/ Don Listwin
Don Listwin

/s/ Michael Everett
Michael Everett

/s/ Michael Flynn
Michael Flynn

/s/ Adam Grosser
Adam Grosser

/s/ Michael Matthews
Michael Matthews

/s/ Thomas Pardun
Thomas Pardun

/s/ Kevin DeNuccio
Kevin DeNuccio

Title

Chief Executive Officer and Director
(Principal Executive Officer)

Chief Financial Officer and Director
(Principal Financial and Accounting Officer)

Date

February 21, 2013

February 21, 2013

Chairman of the Board of Directors

February 21, 2013

Director

Director

Director

Director

Director

Director

83

February 21, 2013

February 21, 2013

February 21, 2013

February 21, 2013

February 21, 2013

February 21, 2013

 
 
 
 
 
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
Schedule II.   Valuation and Qualifying Accounts

Year ended December 31, 2012

Allowance for doubtful accounts
Product return reserve

Year ended December 31, 2011

Allowance for doubtful accounts
Product return reserve

Year ended December 31, 2010

Allowance for doubtful accounts
Product return reserve

Balance
At Beginning
of Year

Additions
Charged to
Costs or
Expenses or
Revenue

Deductions
and Write
Offs

Balance At
End of Year

(In thousands)

$

$

$

402
835

617
551

1,008
1,199

$

$

$

112
5,474

130
4,996

233
2,845

$

$

$

(93)
(4,569)

(345)
(4,712)

(624)
(3,493)

$

$

$

421
1,740

402
835

617
551

84

Exhibit
Number

2.1

2.2

3.1

3.2

4.1

4.2

4.3

4.4

4.5

10.1*

10.2*

10.3*

10.4*

10.5

10.6

10.7

10.8*

10.9*

10.10*

EXHIBIT INDEX

Description

Agreement and Plan of Merger and Reorganization, dated as of September 16, 2010, by and among Calix, Inc., Ocean Sub
I, Inc., Ocean Sub II, LLC, Occam Networks, Inc. (filed as Exhibit 2.1 to Calix’s Registration Statement on Form S-4
originally filed with the Securities and Exchange Commission on November 2, 2010 (File No. 333-170282), as amended by
Amendment No. 1 filed December 14, 2010, as amended by Post-Effective Amendment No. 1, filed December 14, 2010
and as amended by Post-Effective Amendment No. 2, filed February 7, 2011 and incorporated by reference herein).

Support Agreement, dated September 16, 2010, by and among Calix, Inc., Ocean Sub I, Inc., Ocean Sub II, LLC and certain
stockholders of Occam Networks, Inc. (filed as Exhibit 2.2 to Calix’s Registration Statement on Form S-4 originally filed
with the Securities and Exchange Commission on November 2, 2010 (File No. 333-170282), as amended by Amendment
No. 1 filed December 14, 2010, as amended by Post-Effective Amendment No. 1, filed December 14, 2010 and as amended
by Post-Effective Amendment No. 2, filed February 7, 2011 and incorporated by reference herein).

Amended and Restated Certificate of Incorporation of Calix, Inc. (filed as Exhibit 3.3 to Amendment No. 7 to Calix’s
Registration Statement on Form S-1 filed with the Securities and Exchange Commission on March 23, 2010 (File No.
333-163252) and incorporated by reference herein).

Amended and Restated Bylaws of Calix, Inc. (filed as Exhibit 3.5 to Amendment No. 7 to Calix’s Registration Statement on
Form S-1 filed with the Securities and Exchange Commission on March 23, 2010 (File No. 333-163252) and incorporated
by reference herein).

Form of Calix, Inc.’s Common Stock Certificate (filed as Exhibit 4.1 to Amendment No. 7 to Calix’s Registration Statement
on Form S-1 filed with the Securities and Exchange Commission on March 23, 2010 (File No. 333-163252) and
incorporated by reference herein).

Amended and Restated Investors’ Rights Agreement, by and between Calix, Inc. and the investors listed on Exhibit A
thereto, dated May 29, 2009 (filed as Exhibit 4.2 to Calix’s Registration Statement on Form S-1 filed with the SEC on
November 20, 2009 (File No. 333-163252) and incorporated by reference herein).

Warrant to Purchase Stock, between Optical Solutions, Inc. and Silicon Valley Bank, dated August 16, 2004 (filed as
Exhibit 4.22 to Calix’s Registration Statement on Form S-1 filed with the SEC on November 20, 2009 (File No.
333-163252) and incorporated by reference herein).

Assignment, between Silicon Valley Bank and Silicon Valley Bancshares, dated August 19, 2004 (filed as Exhibit 4.23 to
Calix’s Registration Statement on Form S-1 filed with the SEC on November 20, 2009 (File No. 333-163252) and
incorporated by reference herein).

Warrant to Purchase Stock, between Calix, Inc. and Greater Bay Venture Banking, a division of Greater Bay Bank N.A.,
dated September 4, 2007 (filed as Exhibit 4.27 to Calix’s Registration Statement on Form S-1 filed with the SEC on
November 20, 2009 (File No. 333-163252) and incorporated by reference herein).

Calix Networks, Inc. Amended and Restated 2000 Stock Plan and related documents (filed as Exhibit 10.1 to Calix’s
Registration Statement on Form S-1 filed with the SEC on November 20, 2009 (File No. 333-163252) and incorporated by
reference herein).

Calix Networks, Inc. Amended and Restated 2002 Stock Plan and related documents (filed as Exhibit 10.2 to Amendment
No. 6 to Calix’s Registration Statement on Form S-1 filed with the SEC on March 8, 2010 (File No. 333-163252) and
incorporated by reference herein).

Optical Solutions, Inc. Amended and Restated 1997 Long-Term Incentive and Stock Option Plan and related documents
(filed as Exhibit 10.3 to Calix’s Registration Statement on Form S-1 filed with the SEC on November 20, 2009 (File No.
333-163252) and incorporated by reference herein).

Calix, Inc. 2010 Equity Incentive Award Plan and related documents (filed as Exhibit 10.2 to Amendment No. 6 to Calix’s
Registration Statement on Form S-1 filed with the SEC on March 8, 2010 (File No. 333-163252) and incorporated by
reference herein).

Form of Indemnification Agreement made by and between Calix, Inc. and each of its directors, executive officers and some
employees (filed as Exhibit 10.5 to Amendment No. 6 to Calix’s Registration Statement on Form S-1 filed with the SEC on
March 8, 2010 (File No. 333-163252) and incorporated by reference herein).

Lease, between RNM Lakeville, LLC and Calix, Inc., dated February 13, 2009 (filed as Exhibit 10.6 to Calix’s Registration
Statement on Form S-1 filed with the SEC on November 20, 2009 (File No. 333-163252) and incorporated by reference
herein).

Amended and Restated Loan and Security Agreement, by and between Calix, Inc. and Silicon Valley Bank, dated August
21, 2009 (filed as Exhibit 10.7 to Calix’s Registration Statement on Form S-1 filed with the SEC on November 20, 2009
(File No. 333-163252) and incorporated by reference herein).

Offer Letter, between Calix, Inc. and Carl Russo, dated November 1, 2006 (filed as Exhibit 10.8 to Amendment No. 1 to
Calix’s Registration Statement on Form S-1 filed with the SEC on December 31, 2009 (File No. 333-163252) and
incorporated by reference herein).

Offer Letter, between Calix, Inc. and Kelyn Brannon-Ahn, dated April 2, 2008 (filed as Exhibit 10.9 to Amendment No. 1
to Calix’s Registration Statement on Form S-1 filed with the SEC on December 31, 2009 (File No. 333-163252) and
incorporated by reference herein).

Offer Letter, between Calix, Inc. and Tony Banta, dated August 25, 2005 (filed as Exhibit 10.10 to Amendment No. 1 to
Calix’s Registration Statement on Form S-1 filed with the SEC on December 31, 2009 (File No. 333-163252) and
incorporated by reference herein).

85

Exhibit
Number

10.11*

10.12*

10.13*

10.14*

10.15*

10.16

10.17*

10.18*

10.19*

10.20†

10.21*

10.22*

10.23*

10.24*

10.25

10.26*

21.1

23.1

24.1

31.1

31.2

32.1

Description

Offer Letter, between Calix, Inc. and John Colvin, dated March 3, 2004 (filed as Exhibit 10.11 to Amendment No. 1 to
Calix’s Registration Statement on Form S-1 filed with the SEC on December 31, 2009 (File No. 333-163252) and
incorporated by reference herein).

Offer Letter, between Calix, Inc. and Kevin Pope, dated December 21, 2008 (filed as Exhibit 10.12 to Amendment No. 1 to
Calix’s Registration Statement on Form S-1 filed with the SEC on December 31, 2009 (File No. 333-163252) and
incorporated by reference herein).

Offer Letter, between Calix, Inc. and Roger Weingarth, dated February 17, 2003, as amended April 13, 2004 (filed as
Exhibit 10.13 to Amendment No. 1 to Calix’s Registration Statement on Form S-1 filed with the SEC on December 31,
2009 (File No. 333-163252) and incorporated by reference herein).

Offer Letter, between Calix, Inc. and Michael Ashby, dated March 7, 2011 (filed as Exhibit 10.2 to Calix’s Form 8-K filed
with the SEC on March 7, 2011 (File No. 001-34674) and incorporated by reference herein).

Separation Agreement and General Release of All Claims, between Calix, Inc. and Kelyn Brannon, dated March 7, 2011
(filed as Exhibit 10.1 to Calix’s Form 8-K filed with the SEC on March 7, 2011 (File No. 001-34674) and incorporated by
reference herein).

Amendment No. 1 to Amended and Restated Loan and Security Agreement, between Silicon Valley Bank and Calix, Inc.,
dated March 8, 2010 (filed as Exhibit 10.17 to Amendment No. 7 to Calix’s Registration Statement on Form S-1 filed with
the Securities and Exchange Commission on March 23, 2010 (File No. 333-163252) and incorporated by reference herein).

Employment Agreement, between Calix, Inc. and Andrew Lockhart, dated February 2, 2011 (filed as Exhibit 10.20 to
Calix's Form 10-Q filed with the SEC on May 3, 2012 (File No. 001-34674) and incorporated by reference herein).

Calix, Inc. Amended And Restated Employee Stock Purchase Plan (Effective as of May 23, 2012)  (filed as Exhibit 10.1 to
Calix’s Form 10-Q filed with the SEC on August 7, 2012 (File No. 001-34674) and incorporated by reference herein).

Calix, Inc. Non-Employee Director Equity Compensation Policy, as amended October 18, 2011 and July 25, 2012 (filed as
Exhibit 10.2 to Calix’s Form 10-Q filed with the SEC on August 7, 2012 (File No. 001-34674) and incorporated by
reference herein).

Asset Purchase Agreement between Ericsson Inc. and Calix, Inc., dated August 20, 2012 (filed as Exhibit 10.1 to Calix’s
Form 10-Q/A filed with the SEC on December 18, 2012 (File No. 001-34674) and incorporated by reference herein).

Calix, Inc. Non-Employee Director Cash Compensation Policy, effective January 1, 2012 (filed as Exhibit 10.2 to Calix’s
Form 10-Q filed with the SEC on November 2, 2012 (File No. 001-34674) and incorporated by reference herein).

Calix, Inc. Non-Employee Director Restricted Stock Unit Deferred Compensation Plan, effective January 1, 2013.

Calix, Inc. Management Bonus Program Under the 2010 Equity Incentive Award Plan (filed as Exhibit 10.1 to Calix's Form
8-K filed with the SEC on February 28, 2012 (File No. 001-34674) and incorporated by reference herein).

Calix, Inc. Long Term Incentive Program Under the 2010 Equity Incentive Award Plan (filed as Exhibit 10.2 to Calix's
Form 8-K filed with the SEC on February 28, 2012 (File No. 001-34674) and incorporated by reference herein).

First Amendment to Lease, by and between 1031, 1035, 1039 North McDowell, LLC and Calix, Inc., effective January 28,
2013.
Transition and Separation Agreement, by and between Roger Weingarth and Calix, Inc., dated February 6, 2013.

Subsidiaries of the Registrant.

Consent of Ernst & Young LLP, independent registered public accounting firm.

Power of Attorney (included on signature page to this Annual Report on Form 10-K).

Certification of Chief Executive Officer of Calix, Inc. Pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934.

Certification of Chief Financial Officer of Calix, Inc. Pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934.

Certification of Chief Executive Officer and Chief Financial Officer of Calix, Inc. Pursuant to 18 U.S.C. Section 1350, as
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

101.INS **

XBRL Instance Document.

101.SCH **

XBRL Taxonomy Extension Schema Document.

101.CAL **

XBRL Taxonomy Extension Calculation Linkbase Document.

101.DEF **

XBRL Taxonomy Extension Definition Linkbase Document.

101.LAB **

XBRL Taxonomy Extension Label Linkbase Document.

101.PRE **

XBRL Taxonomy Extension Presentation Linkbase Document.

*

†

**

Indicates management compensatory plan, contract or arrangement.

Confidential treatment has been granted as to certain portions of this agreement.

In accordance with Rule 406T of Regulation S-T, the XBRL information is furnished and not filed herewith, is not a part of a
registration statement or Prospectus for purposes of sections 11 or 12 of the Securities Act of 1933, is deemed not filed for
purposes of section 18 of the Securities Exchange Act of 1934, and otherwise is not subject to liability under these sections.

86

CALIX, INC. 
NON-EMPLOYEE DIRECTOR 
RESTRICTED STOCK UNIT 
DEFERRED COMPENSATION PLAN

Exhibit 10.22

Section 1. 

Purpose and Administration.  

(a) 

Purpose; Equity Plan.  The purpose of this Non-Employee Director Restricted Stock 
Unit Deferred Compensation Plan (the “Plan”) is to assist the members of the Board of Directors (the 
“Board”) of Calix, Inc. (the “Company”) who are not employees of the Company (“Non-Employee 
Directors”) in their financial planning by providing a means for the deferral of the settlement of some 
or all of the Awards of Restricted Stock Units granted to such Non-Employee Directors pursuant to the 
Company’s 2010 Equity Incentive Award Plan (as amended from time to time and, collectively with 
any successor plans, the “Equity Plan”).  It is anticipated that the Plan will aid in attracting and 
retaining members of the Board and provide a tax-efficient means for Non-Employee Directors to 
meet the stock ownership guidelines of the Company as in effect from time to time.  Notwithstanding 
anything herein or in the Equity Plan to the contrary, the settlement of an Award of Restricted Stock 
Units may not be deferred, and no Non-Employee Director may elect or determine the settlement date 
with respect to an Award of Restricted Stock Units except pursuant to a Deferral Election (as defined 
below) in accordance with the terms of this Plan.  Unless a Deferral Election is made in accordance 
with the terms of this Plan, the settlement date with respect to any Restricted Stock Units shall be the 
date on which such Restricted Stock Units vest in accordance with the terms of an Award Agreement.  
Defined terms used in this Plan but not defined herein shall have the meanings assigned to such terms 
in the Equity Plan.

(b) 

Administration.  The Plan shall be administered by the Compensation Committee of 

the Board (the “Committee”).    

(c) 

Powers/Duties/Liabilities of the Committee.  The Committee shall implement the 

Plan, and may adopt rules and regulations in furtherance thereof which are not inconsistent with any 
express provisions of the Plan or the Equity Plan.  The Committee shall construe and interpret the Plan 
and any rules or regulations it has adopted, and make such determinations (including without 
limitation determinations of fact) as it determines are necessary or advisable for the administration of 
the Plan.  The interpretations and determinations of the Committee shall be binding and conclusive.  
The Committee may amend the Plan in its discretion, subject to Section 5(e).  No member of the 
Committee shall be liable for any action taken or omitted in connection with the administration of the 
Plan unless attributable to such member’s willful misconduct that results in a material breach of this 
Plan.

Section 2. 

Participation.   

(a) 

Eligible Participants.  Each Non-Employee Director shall be eligible to participate in 

the Plan.  

(b) 

Deferral Elections.  Each Non-Employee Director may participate in the Plan by 

furnishing the Company with an election (a “Deferral Election”), signed by the Non-Employee 
Director, pursuant to which the Non-Employee Director elects to defer settlement of an Award of 

1

Restricted Stock Units.  A Non-Employee Director who timely signs and returns a Deferral Election to 
the Company shall become a “Participant” in the Plan.  A Participant’s Deferral Election with respect 
to an Award may not be modified or revoked after the close of business on the last day the Participant 
may make his or her Deferral Election as provided below, except in the event of an Unforeseeable 
Emergency (as defined below) and if permitted by the Committee in its sole discretion.  Restricted 
Stock Units that are covered by a Deferral Election shall constitute “Deferred Units.”  Deferral 
Elections shall be effective only if furnished to the Committee as follows, provided, that the 
Committee in its discretion may limit the timing of a Deferral Election to one or more of the 
following:

(1) 

on or before December 31 of any calendar year (or such earlier date 

established in the discretion of the Committee) with respect to Awards of Restricted Stock 
Units granted to the Participant in the following calendar year and any subsequent calendar 
years as specified in the Deferral Election; provided, however, that no Deferral Election may 
be made under this subsection 1 with respect to any Awards of Restricted Stock Units granted 
to a Participant with respect to any services performed by such Participant prior to the 
applicable December 31;

(2) 

in the case of the first year in which an employee becomes a Non-Employee 
Director, which first year of eligibility shall be determined in accordance with Treas. Reg. § 
1.409A-2(a)(7), and with respect to Awards of Restricted Stock Units granted to such 
employee after the date of the Deferral Election, within 30 days after the date such employee 
becomes a Non-Employee Director; provided, however, that no election may be made by a 
Non-Employee Director pursuant to this subsection 3 if the Company determines in its sole 
discretion that, prior to becoming a Non-Employee Director, such Non-Employee Director 
was eligible to participate in any “non-qualified deferred compensation plan” (as defined in 
Section 409A of the Internal Revenue Code of 1986, as amended (the “Code”)) that would be 
aggregated with the Plan for purposes of Section 409A of the Code; or

(3) 

on or before the 30th day following the date of any Award of Restricted Stock 
Units, provided, however, that no Deferral Election made pursuant to this subsection 3 shall be 
effective with respect to any Restricted Stock Units that vest prior to the date that that is 
twelve months after the date of such Deferral Election, unless the vesting of such Restricted 
Stock Units during such twelve-month period may only occur in the event of the Participant’s 
death or a change in control event (as defined in Treas. Reg. § 1.409A-3(i)(5).  

Section 3. 

Plan Accounts.   

(a) 

Plan Accounts.  The Company shall establish an account on the books of the Company 

(a “Plan Account”) for each Participant who furnishes a Deferral Election and shall credit the 
Participant’s Plan Account with a number of Deferred Units equal to the number of Restricted Stock 
Units that would have been settled in the absence of the Participant’s Deferral Election.  The 
Committee shall also establish, to the extent necessary, separate subaccounts of a Participant’s Plan 
Account to reflect the Participant’s Deferral Election for different calendar years.  The Committee 
shall debit the Plan Account of a Participant each time a distribution is made to the Participant from his 
Plan Account.

(b) 

Distributions; Adjustments.   

2

(1) 

Cash Distributions in respect of Dividends.  With respect to each Deferred 

Unit in a Participant’s Plan Account on the record date (the “Record Date”) of any cash 
dividend or other distribution paid with respect to shares of common stock of the Company, 
the Company shall pay to each Participant an amount of cash or other property equal to the 
cash payment or other property that would have been paid to the Participant in respect of such 
cash dividend or other distribution under the terms of the applicable Award Agreement, but in 
no event shall any payment be made to the Participant in respect of any cash dividend or other 
distribution if the Record Date with respect to such cash dividend falls after the date on which 
the Participant incurs a Separation from Service.  Any amount payable pursuant to this Section 
3(b)(1) shall be paid to the Participant at the time the respective cash dividend or other 
distribution is paid to the holders of Company common stock, but in no event later than March 
15 of the year following the year in which the Record Date with respect to such cash dividend 
or other distribution falls.  Notwithstanding the foregoing, if the Participant is entitled to such 
cash dividend or other distribution as a result of holding shares of Company common stock 
issued with respect to a distribution made under Section 4 of this Plan on or after the Record 
Date but prior to the payment of the applicable cash dividend or other distribution (the 
“Distributed Shares”), then the Participant shall not also be entitled to receive a cash payment 
with respect to such cash dividend or distribution under this Section 3(b)(1) with respect to the 
Distributed Shares.

(2) 

Changes in Capitalization.  If any change shall occur in or affect shares of 

Company common stock on account of a merger, consolidation, reorganization, stock 
dividend, stock split or combination, reclassification, recapitalization, distribution to holders 
of shares of Company common stock (other than cash dividends) or such similar event (as 
determined by the Committee in its discretion), the Committee shall make such adjustments, if 
any, that it deems necessary or equitable in each Participant’s Plan Account in order to prevent 
the dilution or enlargement of the Participant’s benefits under the Plan.

(c) 

Statements.  As soon as practicable following the close of a calendar year, the 

Company shall furnish to each Participant having a Plan Account a statement setting forth the number 
of Deferred Units in his or her Plan Account at the close of such calendar year.

(d) 

Nature of the Company’s Obligations/Participant’s Rights.  The Company’s liability to 

pay the amount in a Participant’s Plan Account shall be reflected in its books of account as a general, 
unsecured and unfunded obligation, and the rights of a Participant or his or her designated beneficiary 
to receive payments from the Company under the Plan are solely those of a general, unsecured 
creditor.  The Company shall not be required to segregate any of its assets in respect to its obligations 
hereunder, and a Participant or designated beneficiary shall not have any interest whatsoever, vested or 
contingent, in any properties or assets of the Company.  Without limiting the generality or effect of the 
foregoing, a Participant shall have no voting rights with respect to Deferred Units.

(e) 

No Trust.  Nothing contained in the Plan and no action taken pursuant to the 

provisions hereof shall create or be construed to create a trust of any kind, or a fiduciary relationship 
between (i) the Company and the Committee (or any member thereof) and (ii) the Participant, his or 
her designated beneficiary or any other person.

(f) 

Optional Trust.  The Committee, at any time, may authorize the establishment of a 

trust for the benefit of the Participants, the assets of which are always subject to the claims of general 

3

creditors of the Company and containing such other terms and conditions as the Committee shall 
approve.  

(g) 

Vesting.  The number of Deferred Units in a Participant’s Plan Account shall be vested 

and nonforfeitable on the same date that the corresponding Restricted Stock Units would have vested 
in accordance with the terms of the applicable Award Agreement.

Section 4. 

Distributions in Respect of Plan Accounts.   

(a) 

Scheduled Distributions.  Distributions in respect of a Participant’s Plan Account shall 
be made in accordance with the distribution option elected by such Participant in the Deferral Election 
(the “Distribution Election”).  A separate Distribution Election shall apply to each Deferral Election.  
Subject to Section 4(b), the distribution options available under the Plan are as follows:

(1) 

Separation from Service.  Distribution as soon as practicable following the 
Participant’s Separation from Service as determined by the Company, but in no event later 
than December 31st of the year of the Participant’s Separation from Service.  For purposes of 
this Plan, a Separation from Service shall mean the Participant’s “separation from service” 
with the Company as such term is defined in Treasury Regulation § 1.409A-1(h) and any 
successor provision thereto.

(2) 

Date Certain.  Distribution on a date fixed by the Participant in the Deferral 

Election (or in any Rollover Election as provided in Section 4(d) below).

(b) 

Accelerated Distributions.   

(1) 

Death of Participant.  If a Participant dies, the amount of the then-current 

balance credited to his or her Plan Account shall be distributed to the designated beneficiary of 
the Participant, or if there is no designated beneficiary or such beneficiary does not survive the 
Participant, such distribution shall be made to the estate of the Participant.  Such distributions 
shall be made as soon as practicable following the date of the Participant’s death, but in no 
event later than December 31st of the year of the Participant’s death.  Notwithstanding the 
foregoing, with respect to amounts deferred pursuant to a Deferral Election made in 
accordance with Section 2(b)(3) of this Plan, if the Participant dies prior to the date that is 
twelve months after the date of such Deferral Election, such Deferral Election shall not be 
given effect and such amounts shall be distributed to the beneficiary of the Participant in 
accordance with the terms of the applicable Award Agreement.

(2) 

Financial Emergency.  If a Participant encounters a severe and unforeseeable 

financial emergency, the Committee may authorize prompt distribution to the Participant of 
such portion of the amount in the Plan Account of the Participant as is required to meet the 
immediate financial need created by the emergency.  For purposes hereof, financial emergency 
shall include a severe financial hardship resulting from a sudden and unexpected illness or 
accident of the Participant or a dependent, the loss of the Participant’s property due to casualty 
or any other similar extraordinary and unforeseeable circumstances arising as a result of 
events beyond the control of the Participant, in each case as determined in the sole discretion 
of the Committee, provided, however, that no accelerated distribution shall be authorized 
unless such financial emergency constitutes an “unforeseeable emergency” within the meaning 
of Treasury Regulation § 1.409A-3(i)(3) or any successor provision thereto (an 
“Unforeseeable Emergency”).  Without limiting the foregoing, distribution of the Participant’s 

4

Plan Account will not be made to the extent that any such hardship may be relieved through 
reimbursement or compensation by insurance or otherwise, by liquidation of the Participant’s 
assets (to the extent such liquidation would not itself cause a severe financial hardship) or by 
the cessation of deferrals under the Plan in accordance with the terms of the Plan.  To apply for 
an accelerated payment by reason of financial emergency as aforesaid, the Participant shall 
furnish the Committee, in writing and in reasonable detail, with the relevant facts and 
information, and the determination of the Committee as to whether an Unforeseeable 
Emergency has occurred and whether an accelerated payment is warranted under this 
provision and the amount of any such payment shall be binding and conclusive.

(3) 

Change in Control.  If there is a Change in Control of the Company, then the 

amount of each Participant’s Plan Account shall be paid immediately to such Participant.  
Notwithstanding the foregoing, with respect to amounts deferred pursuant to a Deferral 
Election made in accordance with Section 2(b)(3) of this Plan, if a Change in Control occurs 
prior to the date that is twelve months after the date of such Deferral Election, such Deferral 
Election shall not be given effect and such amounts shall be distributed to the Participant in 
accordance with the terms of the applicable Award Agreement.  For the purposes of the Plan, 
no Change in Control shall be deemed to occur unless there has been a change in the 
ownership or effective control of the Company or a change in the ownership of a substantial 
portion of the assets of the Company, in each case within the meaning of Treas. Reg. § 
1.409A-3(i)(5).

(c) 

Designation of Beneficiary.  A Participant shall have the right to designate a 

beneficiary for the purposes of receiving an accelerated distribution as provided in Section 4(b)(1) 
above at any time by furnishing the Company with a Beneficiary Designation Form.  A Participant 
may change or revoke a beneficiary designation at any time and from time to time by furnishing a 
revised Beneficiary Designation Form to the Company.

(d) 

Rollover Elections.  A Participant may file an additional Deferral Election (a 

“Rollover Election”) with respect to any Deferred Units for which a distribution option under Section 
4(a)(2) has previously been elected, provided that (i) such Rollover Election is filed at least twelve 
months before the distribution date specified in the prior Distribution Election, (ii) such Rollover 
Election specifies a distribution date at least five years later than the distribution date specified in the 
prior Distribution Election, and (iii) the requirements of Treasury Regulation Section 1.409A-2(b) are 
otherwise met.

(e) 

Form of Distribution.  Notwithstanding anything to the contrary in an Award 

Agreement, distribution of a Participant’s Plan Account shall be in the form of shares of Company 
common stock.

Section 5. 

Miscellaneous Provisions.   

(a) 

No Assignment.  The rights and interests of the Participants under the Plan may not be 

anticipated, assigned, transferred, pledged or encumbered, except upon death by virtue of the law of 
descent and distribution.  Any attempt by the Participant so to anticipate, assign, transfer, pledge or 
encumber purported rights and interest shall be null and void.

(b) 

No Service Contract/Bonus Commitment.  The Plan does not constitute a service 

contract between the Company and the Participant.  Neither the Plan nor the accrual of Deferred Units 
hereunder shall constitute an undertaking, express or implied, giving the Participant the right to remain 
5

in the service of the Company or interfere with the right of the Company and its stockholders to 
terminate the Participant’s service, nor giving the right to require the Participant to remain in its 
service or to interfere with the Participant’s right to terminate service.  Participation in the Plan does 
not confer upon a Participant the right to receive an Award of Restricted Stock Units from the 
Company in any year.

(c) 

Entire Plan.  The Plan, collectively with the Equity Plan, any Deferral Election Form 

and any Beneficiary Designation Form, constitutes the entire understanding and agreement between 
the Participant and the Company in respect of the subject matter hereof, and neither party has relied on 
any representations of the other party except as expressly set forth herein.

(d) 

Binding Effect.  This Plan shall be binding upon and inure to the benefit of (i) the 
Company, its successors and assigns by merger, consolidation, purchase or otherwise, and (ii) the 
Participant and the heirs, executors, administrators and legal representatives of such Participant.

(e) 

Amendment and Termination.  The Company at any time and from time to time, but 
only in a manner that complies with Treasury Regulation § 1.409A-3(j)(4)(ix), may amend, modify, 
suspend, reinstate or terminate this Plan in whole or in part in such respects as it may deem advisable; 
provided, however, that no such amendment, modification, suspension, reinstatement or termination 
shall adversely affect the rights of a Participant with respect to the amount then credited to the Plan 
Account of such Participant.  In the event that the Plan is terminated as described in Treasury 
Regulation Section 1.409A-3(j)(4)(ix), the balance in a Participant’s Plan Account shall be paid to such 
Participant or beneficiary, as applicable, in full satisfaction of all such Participant’s or beneficiary’s 
rights and benefits hereunder, pursuant to the applicable requirements of Treasury Regulation § 
1.409A-3(j)(4)(ix).

(f) 

Governing Law.  The Plan shall be governed by and construed and interpreted in 

accordance with the laws of the State of California, including without limitation, the California statute 
of limitations, but without giving effect to the principles of conflict of laws of such State.

(g) 

Section 409A Compliance.  Notwithstanding any provision of the Plan to the contrary, 
if at the time of the Participant’s Separation from Service, the Participant is a “specified employee” as 
defined in Section 409A the Code, as reasonably determined by the Company in accordance with 
Section 409A of the Code, and the deferral of the commencement of any distributions that would 
otherwise be made hereunder as a result of such Separation from Service is necessary in order to 
prevent any accelerated or additional tax under Section 409A of the Code, then the Company will 
defer the commencement of the distributions hereunder until the date that is at least six (6) months 
following the Participant’s Separation from Service (or the earliest date permitted under Section 409A 
of the Code), whereupon the Company will make such distributions to the Participant that would have 
otherwise been previously made to the Participant under the Plan during the period in which such 
distributions were deferred.  Thereafter, distributions will resume in accordance with the Plan.  It is 
intended that this Plan shall be limited, construed and interpreted in accordance with Section 409A of 
the Code.  It is also intended that to the extent that any payment or benefit described hereunder is 
subject to Section 409A of the Code, it shall be paid in a manner that will comply with Section 409A 
of the Code, including guidance issued by the Secretary of the Treasury and the Internal Revenue 
Service with respect thereto.  No provision in this Plan shall be interpreted or construed to directly or 
indirectly transfer any liability for a failure to comply with Section 409A of the Code from a 
Participant or other individual to the Company, or any other individual or entity affiliated with the 
Company.

6

(h) 

Expenses of the Plan.  All expenses of administering the Plan shall be borne by the 

Company.

(i) 

Notice.  Any notice in connection with the Plan shall be in writing and shall be 

delivered in person or by certified mail, return receipt requested.  Any notice given by certified mail 
shall be deemed to have been given upon the date of delivery indicated on the certified mail return 
receipt, if correctly addressed.

(j) 

Effective Date and Term.  The Plan shall be effective as of the date this plan is 

adopted, and subject to Section 5(e) shall continue in effect until terminated by the Company.

*     *     *     *     *

7

Exhibit 10.25

FIRST AMENDMENT 

THIS FIRST AMENDMENT (this “Amendment”) is made and entered into as of January 28, 
2013,  by  and  between  1031,  1035,  1039  NORTH  MCDOWELL,  LLC,  a  Delaware  limited  liability 
company (“Landlord”), and CALIX NETWORKS, INC., a Delaware corporation (“Tenant”).

RECITALS

A. 

Landlord (as successor in interest to RNM Lakeville, LLC, a Delaware limited liability company) 
and Tenant are parties to that certain lease dated February 13, 2009 (the “Lease”).  Pursuant to the 
Lease,  Landlord  has  leased  to Tenant  space  currently  containing  approximately  82,082  rentable 
square feet (the “Premises”) in the building located at 1035 North McDowell Boulevard, Petaluma, 
California (the “Building”).

B. 

The Lease by its terms shall expire on February 15, 2014 (“Prior Expiration Date”), and the parties 
desire to extend the Lease Term, all on the following terms and conditions.

NOW, THEREFORE, in consideration of the mutual covenants and agreements herein contained 
and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, 
Landlord and Tenant agree as follows:

1. 

2. 

Extension.  The Lease Term is hereby extended for a period of sixty (60) months and thirteen (13) 
days and shall expire on February 28, 2019 (“Extended Expiration Date”), unless sooner terminated 
in accordance with the terms of the Lease.  That portion of the Lease Term commencing the day 
immediately following the Prior Expiration Date (“Extension Date”) and ending on the Extended 
Expiration Date shall be referred to herein as the “Extended Lease Term”.

Base Rent.  Notwithstanding anything to the contrary contained in the Lease, as of February 1, 2013, 
the schedule of Base Rent payable with respect to the Premises during the remainder of the current 
Lease Term and during the Extended Lease Term is the following:

Period

2/1/2013 – 1/31/2014
2/1/2014 – 1/31/2015
2/1/2015 – 1/31/2016
2/1/2016 – 1/31/2017
2/1/2017 – 1/31/2018
2/1/2018 – 1/31/2019
2/1/2019 – 2/28/2019

Rentable Square
Footage
82,082
82,082
82,082
82,082
82,082
82,082
82,082

Annual Base Rent Monthly Base Rent

$886,485.60
$913,080.17
$940,472.58
$968,686.76
$997,747.36
$1,027,679.78
$1,058,510.17

$73,873.80
$76,090.01
$78,372.72
$80,723.90
$83,145.61
$85,639.98
$88,209.18

All such Base Rent shall be payable by Tenant in accordance with the terms of the Lease, as amended 
hereby.  Notwithstanding anything in the Lease, as amended hereby, to the contrary, so long as Tenant 
is not in default under the Lease, as amended hereby, Tenant shall be entitled to an abatement of 
Base  Rent  with  respect  to  the  Premises  in  the  amount  of  $73,873.80  per  month  for  the  period 
commencing February 1, 2013 and continuing until April 30, 2013.  The maximum total amount of 
Base  Rent  abated  with  respect  to  the  Premises  in  accordance  with  the  foregoing  shall  equal 

1

$221,621.40 (the “Abated Base Rent”).  If Tenant defaults under the Lease, as amended hereby, at 
any time during the remainder of the current Lease Term or the Extended Lease Term and fails to 
cure such default within any applicable cure period under the Lease, then all Abated Base Rent shall 
immediately become due and payable.  Only Base Rent shall be abated pursuant to this Section, as 
more particularly described herein, and Tenant’s Share of Operating Expenses and all other rent and 
other costs and charges specified in the Lease, as amended hereby, shall remain as due and payable 
pursuant to the provisions of the Lease, as amended hereby.

3. 

4. 

Additional Security Deposit and Letter of Credit.   No additional Security Deposit shall be required 
in connection with this Amendment.  Landlord currently holds a Letter of Credit in the amount of 
$300,000.00 pursuant to the terms of Paragraph 5 the Lease.  Notwithstanding anything to the contrary 
set forth in the Lease, provided that Tenant is not in default beyond any applicable notice and cure 
period set forth in the Lease, upon the full execution and delivery of this Amendment, Tenant shall 
have no further obligation to maintain the Letter of Credit in accordance with the terms of the Lease.  
Within thirty (30) days following the full execution and delivery of this Amendment, Landlord shall 
return the Letter of Credit to Tenant.

Additional Rent.  For the period commencing on the Extension Date and ending on the Extended 
Expiration Date, Tenant shall pay all additional rent payable under the Lease, including Tenant’s 
Share of Operating Expenses in accordance with the terms of the Lease, as amended hereby.

5. 

Improvements to Premises.

5.1 

5.2 

Condition of Premises.  Tenant is in possession of the Premises and accepts the same “as 
is” without any agreements, representations, understandings or obligations on the part of 
Landlord to perform any alterations, repairs or improvements, except as may be expressly 
provided  otherwise  in  this Amendment.    Tenant  hereby  acknowledges  and  agrees  that 
Landlord has fulfilled all of its obligations pursuant to Exhibit “C” to the Lease.

Responsibility for Improvements to Premises.  Tenant may perform improvements to the 
Premises in accordance with the Exhibit A attached hereto and Tenant shall be entitled to 
an  improvement  allowance  in  connection  with  such  work  as  more  fully  described  in 
Exhibit A.

6. 

Other  Pertinent  Provisions.    Landlord  and  Tenant  agree  that,  effective  as  of  the  date  of  this 
Amendment (unless  different effective date(s) is/are  specifically referenced  in  this Section), the 
Lease shall be amended in the following additional respects:

6.1 

Landlord’s Address.  Landlord’s Address set forth on the signature page of the Lease is 
hereby deleted in its entirety and replaced with the following:

“1031, 1035, 1039 North McDowell, LLC
c/o Investcorp International, Inc.
280 Park Avenue – 36th Floor
New York, New York 10017

With a copy to:

Investcorp International, Inc.
c/o Veritas Property Management
1600 Corporate Circle
Petaluma, California 94954”

2

6.2 

6.3 

Extension Option.  Tenant has exercised its first Extension Option and has one Extension 
Option remaining to renew the Lease Term pursuant to Paragraph 26 of the Lease.

Right of First Offer.  The Right of First Offer set forth in Paragraph 27 of the Lease is 
deleted in its entirety and is null and void and of no further force and effect.

7. 

Miscellaneous.

7.1 

7.2 

7.3 

7.4 

7.5 

This Amendment, including Exhibit A (Tenant Alterations) attached hereto, sets forth the 
entire agreement between the parties with respect to the matters set forth herein.  There have 
been no additional oral or written representations or agreements.  Under no circumstances 
shall  Tenant  be  entitled  to  any  rent  abatement,  improvement  allowance,  leasehold 
improvements, or other work to the Premises, or any similar economic incentives that may 
have been provided Tenant in connection with entering into the Lease, unless specifically 
set forth in this Amendment.

Except as herein modified or amended, the provisions, conditions and terms of the Lease 
shall remain unchanged and in full force and effect.  In the case of any inconsistency between 
the provisions of the Lease and this Amendment, the provisions of this Amendment shall 
govern and control.  The capitalized terms used in this Amendment shall have the same 
definitions as set forth in the Lease to the extent that such capitalized terms are defined 
therein and not redefined in this Amendment.

Submission of this Amendment by Landlord is not an offer to enter into this Amendment 
but rather is a solicitation for such an offer by Tenant.  Landlord shall not be bound by this 
Amendment until Landlord has executed and delivered the same to Tenant.

Tenant hereby represents to Landlord that Tenant has dealt with no broker in connection 
with this Amendment.  Tenant agrees to indemnify and hold Landlord and the Landlord 
Indemnitees harmless from all claims of any brokers claiming to have represented Tenant 
in connection with this Amendment.  

Each signatory of this Amendment represents hereby that he or she has the authority to 
execute and deliver the same on behalf of the party hereto for which such signatory is acting.  
Tenant hereby represents and warrants that neither Tenant, nor any persons or entities holding 
any  legal  or  beneficial  interest  whatsoever  in Tenant,  are  (i)  the  target  of  any  sanctions 
program that is established by Executive Order of the President or published by the Office 
of Foreign Assets Control, U.S. Department of the Treasury (“OFAC”); (ii) designated by 
the President or OFAC pursuant to the Trading with the Enemy Act, 50 U.S.C. App.  § 5, 
the International Emergency Economic Powers Act, 50 U.S.C. §§ 1701-06, the Patriot Act, 
Public Law 107-56, Executive Order 13224 (September 23, 2001) or any Executive Order 
of the President issued pursuant to such statutes; or (iii) named on the following list that is 
published by OFAC: “List of Specially Designated Nationals and Blocked Persons.” If the 
foregoing representation is untrue at any time during the Extended Lease Term, an Event 
of Default under the Lease will be deemed to have occurred, without the necessity of notice 
to Tenant.

7.6 

Redress for any claim against Landlord under the Lease and this Amendment shall be limited 
to and enforceable only against and to the extent of Landlord's interest in the Building. The 
obligations of Landlord under the Lease are not intended to and shall not be personally 
binding on, nor shall any resort be had to the private properties of, any of its trustees or 

3

board of directors and officers, as the case may be, its investment manager, the general 
partners thereof, or any beneficiaries, stockholders, employees, or agents of Landlord or the 
investment manager, and in no case shall Landlord be liable to Tenant hereunder for any 
lost profits, damage to business, or any form of special, indirect or consequential damage. 

[SIGNATURE PAGE FOLLOWS]

4

IN WITNESS WHEREOF, Landlord and Tenant have entered into and executed this Amendment 

as of the date first written above.

LANDLORD:

TENANT:

1031, 1035, 1039 NORTH MCDOWELL, LLC,
a Delaware limited liability company

CALIX NETWORKS, INC., 
a Delaware corporation

By:  PVP Holdings JV, LLC,
        a Delaware limited liability company

By:  PVP Holdings Capital, LLC,
        a Delaware limited liability company
        its Managing Member

By:    /s/ H. Herbert Myers                                                 

By:    /s/ Jim Sanfillippo                                                    

Name:    H. Herbert Myers                                  

Name:    Jim Sanfillippo                                      

Its:     Vice President                                            

Its:     Director, Facilities                                     

Dated:  February 6, 2013

Dated:  February 1, 2013

5

EXHIBIT A – TENANT ALTERATIONS

attached to and made a part of the Amendment dated as of February 1, 2013,
between 1031, 1035, 1039 NORTH MCDOWELL, LLC, a Delaware limited liability company, 
as Landlord and CALIX NETWORKS, INC., a Delaware corporation, as Tenant

Tenant, following the full and final execution and delivery of the Amendment to which this Exhibit 
1. 
A is attached, shall have the right to repair, replace and/or upgrade, as necessary, the heating, ventilation and 
air conditioning system exclusively servicing the Premises, and to otherwise perform repair, remodeling, 
maintenance and construction work, as necessary, in the Premises (collectively, the “Tenant Alterations”).  
Notwithstanding the foregoing, Tenant and its contractors shall not have the right to perform the Tenant 
Alterations in the Premises unless and until Tenant has complied with all of the terms and conditions of 
Paragraph 10.2 of the Lease, including, without limitation, approval by Landlord of the contractors to be 
retained by Tenant to perform such Tenant Alterations. Tenant shall be responsible for all elements of the 
Tenant Alterations  (including, without limitation, compliance with law, functionality of design, the structural 
integrity of the design, the configuration of the Premises and the placement of Tenant’s furniture, appliances 
and equipment), and Landlord’s approval of any plans shall in no event relieve Tenant of the responsibility 
for such design.  In addition to the foregoing, Tenant shall be solely liable for all costs and expenses associated 
with  or  otherwise  caused  by Tenant’s  performance  and  installment  of  the Tenant Alterations  (including, 
without limitation, any legal compliance requirements arising outside of the Premises).  Landlord’s approval 
of the contractors to perform the Tenant Alterations shall not be unreasonably withheld.  The parties agree 
that Landlord’s approval of the general contractor to perform the Tenant Alterations shall not be considered 
to be unreasonably withheld if any such general contractor (a) does not have trade references reasonably 
acceptable to Landlord, (b) does not maintain insurance as required pursuant to the terms of the Lease, (c) 
does not have the ability to be bonded for the work in an amount of no less than one hundred fifty percent 
(150%) of the total estimated cost of the Tenant Alterations, (d) does not provide current financial statements 
reasonably acceptable to Landlord, or (e) is not licensed as a contractor in the state/municipality in which 
the Premises is located.  Tenant acknowledges the foregoing is not intended to be an exclusive list of the 
reasons why Landlord may reasonably withhold its consent to a general contractor.

Provided Tenant is not in default, Landlord agrees to contribute the sum of $410,410.00 (representing 
2. 
$5.00 per rentable square foot of the Premises) (the “Allowance”) toward costs which are payable by Tenant 
and reasonably related to Tenant’s performance of the Tenant Alterations in the Premises (including, without 
limitation, space planning costs, third party consultant fees and contractor fees).  Except as provided above 
and  in  Section  3  below,  the Allowance  may  only  be  used  for  hard  costs  in  connection  with  the Tenant 
Alterations.  The Allowance shall be paid to Tenant or, at Tenant’s option, to the order of the general contractor 
that performed the Tenant Alterations, within thirty (30) days following receipt by Landlord of (a) receipted 
bills covering all labor and materials expended and used in the Tenant Alterations; (b) a sworn contractor’s 
affidavit from the general contractor and a request to disburse from Tenant containing an approval by Tenant 
of the work done; (c) full and final waivers of lien; and (d) the certification of Tenant that the Tenant Alterations 
have been installed in a good and workmanlike manner, and in accordance with applicable laws, codes and 
ordinances.  The Allowance shall be disbursed in the amount reflected on the receipted bills meeting the 
requirements above.  Notwithstanding anything herein to the contrary, Landlord shall not be obligated to 
disburse any portion of the Allowance during the continuance of an uncured default under the Lease, and 
Landlord’s obligation to disburse shall only resume when and if such default is cured.

In no event shall the Allowance be used for the purchase of equipment, furniture or other items of 
3. 
personal property of Tenant. If Tenant does not submit a request for payment of the entire Allowance to 
Landlord in accordance with the provisions contained in this Exhibit A by February 1, 2015, any unused 

A-1

Initials

 
 
 
amount shall accrue to the sole benefit of Landlord, it being understood that Tenant shall not be entitled to 
any credit, abatement or other concession in connection therewith. Notwithstanding anything to the contrary 
set forth herein, upon completion of the Tenant Alterations and application of the Allowance to the costs 
related thereto pursuant to Section 2 above, if any portion of the Allowance is then remaining (the “Unused 
Allowance”), Tenant, provided it is not in default under the Lease, as amended, shall be entitled to deliver 
written notice to Landlord by no later than February 1, 2015, requesting that Landlord apply the Unused 
Allowance (if any)  as a credit against the next installment(s) of Base Rent payable by Tenant under the 
Lease, as amended hereby.  However, in no event shall Landlord have any obligation to apply any portion 
of the Unused Allowance to Base Rent if Tenant does not deliver such written notice to Landlord by February 
1, 2015 and any unused amount remaining after such date shall accrue to the sole benefit of Landlord, it 
being understood that Tenant shall not be entitled to any credit, abatement or other concession in connection 
therewith.  Tenant shall be responsible for all applicable state sales or use taxes, if any, payable in connection 
with the Tenant Alterations and/or Allowance.

4. 
Tenant agrees to accept the Premises in its “as-is” condition and configuration, it being agreed that 
Landlord shall not be required to perform any work or, except as provided above with respect to the Allowance, 
incur any costs in connection with the construction or demolition of any improvements in the Premises.

This Exhibit A shall not be deemed applicable to any additional space added to the Premises at any 
5. 
time or from time to time, whether by any options under the Lease or otherwise, or to any portion of the 
original Premises or any additions to the Premises in the event of a renewal or extension of the original Term 
of the Lease, whether by any options under the Lease or otherwise, unless expressly so provided in the Lease 
or any amendment or supplement to the Lease.

[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

A-2

Initials

 
 
 
TRANSITION AND SEPARATION AGREEMENT

Exhibit 10.26

This Transition and Separation Agreement (“Agreement”) is made by and between Roger 
Weingarth (“Executive”) and Calix, Inc., a Delaware corporation (“Company”), effective as of the date 
Executive signs this Agreement (“Effective Date”), with reference to the following facts:

A. 
of the Company.

Executive currently serves as the Executive Vice President and Chief Operating Officer 

B.   

Executive and the Company desire for Executive to transition to the role of Advisor to 

the Chief Executive Officer effective as of April 1, 2013 (“Transition Date”).

C.  

Executive and the Company desire for Executive to terminate employment with the 

Company as of March 31, 2014 (“Termination Date”). 

D. 

Executive and the Company want to transition Executive’s duties and end their 

relationship amicably and also to establish the obligations of the parties including, without limitation, all 
amounts due and owing to Executive.

The parties agree as follows:

1. 

Continued Employment.  Unless Executive is terminated by the Company for Cause 

(within the meaning of the Company’s Executive Change in Control and Severance Plan (“Severance 
Plan”)) or Executive voluntarily resigns from the Company, Executive shall continue to serve as the 
Company’s Executive Vice President and Chief Operating Officer and continue his current duties and 
responsibilities (including leading the integration of the Ericsson Access business and such other duties 
that may be assigned by the Company’s Chief Executive Officer from time to time), compensation 
arrangements and benefit plans until the Transition Date.  Executive acknowledges that, while 
continuing to serve as the Company’s Executive Vice President and Chief Operating Officer, Executive 
shall continue to be subject to the requirements of Section 16 of by the Securities Exchange Act of 1934, 
as amended (“Exchange Act”).  Executive shall no longer be eligible to participate in the Severance Plan 
and Executive’s letter agreement with the Company under the Severance Plan shall be deemed 
terminated and superseded in its entirety by this Agreement.

2. 

Transition Period.

(a)  Transition Period.  Unless Executive’s employment with the Company is terminated by 
the Company for Cause or Executive voluntarily resigns from the Company, during the period of 
time (“Transition Period”) commencing on the Transition Date and ending on the Termination 
Date, Executive shall remain employed by the Company as the Advisor to the Chief Executive 
Officer and Executive shall provide transition services in Executive’s areas of expertise and 
work experience and responsibility and such other duties as shall be assigned by the Chief 
Executive Officer or other officer of the Company designated by the Chief Executive Officer 
(“Transition Duties”).  Executive acknowledges and agrees that, during the Transition Period, 
Executive shall not, directly or indirectly, become employed by or provide assistance to any 
Competitor (as defined below) of the Company and may only accept employment with a 
Competitor if Executive receives written consent from the Company’s Chief Executive Officer.  
Executive shall otherwise devote such time and attention to Executive’s Transition Duties as 

1

 
 
 
 
 
 
 
shall reasonably be required.  For purposes of this Agreement, “Competitor” means any 
company that could reasonably be considered to be a competitor of Company, including without 
limitation all of the following entities and their respective parents, affiliates and subsidiaries:  
Accedian Networks Inc.; ADTRAN, Inc.; Alcatel-Lucent, S.A.; BTI Systems Inc.; CIENA Corp.; 
Cisco Systems, Inc.; Cyan, Inc.; Huawei Technologies Co., Ltd.; Tellabs Inc.; Zhone 
Technologies Inc.; and ZTE Corporation.

(b)  Salary and Benefits Continuation.  During the Transition Period, Executive will continue 
to be paid an annual base salary of $313,400, paid in bi-weekly installments in accordance with 
the Company’s standard payroll practices, accrue paid vacation and be eligible for all employee 
benefit plans available to senior executives of the Company (other than the Severance Plan) 
through the Termination Date.  All payments made to Executive during the Transition Period will 
be subject to standard payroll deductions and withholdings.  

(c)  Equity Awards.  Each stock option, restricted stock award and restricted stock unit award 

held by Executive shall continue to vest in accordance with its terms and remain outstanding 
based upon Executive’s continued service during the Transition Period. 

(d)  Business Expenses.  The Company shall reimburse Executive for all outstanding 
expenses incurred prior to the Termination Date which are consistent with the Company’s 
policies in effect from time to time with respect to travel, entertainment and other business 
expenses, subject to the Company’s requirements with respect to reporting and documenting 
such expenses.  

(e)  SEC Reporting.  Executive acknowledges that to the extent required by the Exchange 
Act, Executive will have continuing obligations under Section 16(a) and 16(b) of the Exchange 
Act to report his transactions in Company common stock for six months following the Transition 
Date.  Executive agrees not to undertake, directly or indirectly, any reportable transactions which 
include, but are not limited to, buying, selling or otherwise disposing of any common stock of 
the Company held by Executive until the end of such six-month period.

(f)  Protection of Information.  Executive agrees that, during the Transition Period and 
thereafter, Executive will not, except for the purposes of performing the Transition Duties, seek 
to obtain any confidential or proprietary information or materials of the Company.

3. 

Final Paycheck.  Executive acknowledges and agrees that, unless Executive’s 

employment with the Company is terminated earlier by the Company for Cause or by Executive for any 
reason, Executive’s status as an employee of the Company will end effective as of the Termination Date.  
As soon as administratively practicable on or after the Termination Date, the Company will pay 
Executive all accrued but unpaid base salary and all accrued and unused vacation earned through the 
Termination Date, subject to standard payroll deductions and withholdings.  Executive is entitled to 
these payments regardless of whether Executive executes or revokes this Agreement or the Release of 
Claims (as defined below).  Following the Termination Date, Executive may elect to receive continued 
healthcare coverage under the provisions of the Consolidated Omnibus Budget Reconciliation Act of 
1985, as amended.

4. 

Separation Payments and Benefits.  

(a)  Accelerated Vesting.  Without admission of any liability, fact or claim, the Company 
agrees, subject to the execution of this Agreement and Executive’s delivery to the Company of 

2

the General Release of Claims attached as Exhibit A (“Release of Claims”) that becomes 
effective and irrevocable on or within 30 days following the Termination Date, and Executive’s 
performance of his continuing obligations under this Agreement and the Confidential 
Information and Invention Assignment Agreement entered into between Executive and the 
Company effective March 3, 2003, as may be amended from time to time (“Confidentiality 
Agreement”), to provide, as severance benefits, full acceleration of the vesting and, if applicable, 
exercisability of each stock option, restricted stock award and restricted stock unit award held by 
Executive as of the Termination Date, such acceleration to be effective as of the date the Release 
of Claims first becomes irrevocable.  Executive acknowledges that Executive’s stock options 
shall remain exercisable until the three month anniversary of the Termination Date.  Any stock 
options held by Executive but not exercised prior to the three month anniversary of the 
Termination Date will automatically terminate.   

(b)  Sole Separation Benefit.  Executive agrees that the accelerated vesting provided by this 
Section 4 is not required under the Company’s normal policies and procedures and is provided as 
a severance solely in connection with this Agreement and the Release of Claims.  Executive 
acknowledges and agrees that the accelerated vesting referenced in this Section 4 constitutes 
adequate consideration, in and of itself, for the promises contained in this Agreement and the 
Release of Claims.

5. 

Full Payment.  Executive acknowledges that the payment and arrangements set forth 

above shall constitute full and complete satisfaction of any and all amounts due and owing to Executive 
as a result of his employment with the Company and the termination thereof.  

6. 

Executive’s Release of the Company.  Executive understands that by agreeing to the 

release provided by this Section 6, Executive is agreeing not to sue, or otherwise file any claim against, 
the Company or any of its employees or other agents for any reason whatsoever based on anything that 
has occurred as of the date Executive signs this Agreement.

(a)  On behalf of Executive and Executive’s heirs, assigns, executors, administrators, trusts, 
spouse and estate, Executive releases and forever discharges the “Releasees,” consisting of the 
Company, and each of its owners, affiliates, subsidiaries, predecessors, successors, assigns, 
agents, directors, officers, partners, employees, and insurers, and all persons acting by, through, 
under or in concert with them, or any of them, of and from any and all manner of action or 
actions, cause or causes of action, in law or in equity, suits, debts, liens, contracts, agreements, 
promises, liability, claims, demands, damages, loss, cost or expense, of any nature whatsoever, 
known or unknown, fixed or contingent (“Claims”), which Executive now has or may later have 
against the Releasees, or any of them, by reason of any matter, cause, or thing whatsoever from 
the beginning of time to the Effective Date, including, without limitation, any Claims arising out 
of, based upon, or relating to Executive’s hire, employment, remuneration or resignation by the 
Releasees, or any of them, Claims arising under federal, state, or local laws relating to 
employment, Claims of any kind that may be brought in any court or administrative agency, 
including any Claims arising under Title VII of the Civil Rights Act of 1964, as amended by the 
Civil Rights Act of 1991, 42 U.S.C. § 2000 et seq.; the Equal Pay Act, 29 U.S.C. § 206(d); the 
Civil Rights Act of 1866, 42 U.S.C. § 1981; the Family and Medical Leave Act of 1993, 29 
U.S.C. § 2601 et seq.; the Americans with Disabilities Act of 1990, 42 U.S.C. § 12101 et seq.; 
the False Claims Act, 31 U.S.C. § 3729 et seq.; the Employee Retirement Income Security Act, 
29 U.S.C. § 1001 et seq.; the Worker Adjustment and Retraining Notification Act, 29 U.S.C.  § 
2101 et seq.; the Fair Labor Standards Act, 29 U.S.C. § 215 et seq.; the Sarbanes-Oxley Act of 
2002; the California Labor Code; the employment and civil rights laws of California; Claims for 

3

breach of contract; Claims arising in tort, including, without limitation, Claims of wrongful 
dismissal or discharge, discrimination, harassment, retaliation, fraud, misrepresentation, 
defamation, libel, infliction of emotional distress, violation of public policy, and/or breach of the 
implied covenant of good faith and fair dealing; and Claims for damages or other remedies of 
any sort, including, without limitation, compensatory damages, punitive damages, injunctive 
relief and attorney’s fees.

(b)  Executive does not release the following claims:

Claims for unemployment compensation or any state disability insurance benefits 

(i) 
under the terms of state law; 

Claims for workers’ compensation insurance benefits under the terms of any 

(ii) 
worker’s compensation insurance policy or fund of the Company;

Claims to continued participation in certain of the Company’s group benefit plans 

(iii) 
under the terms and conditions of COBRA;

Claims to any benefit entitlements vested as the date of Executive’s employment 

(iv) 
termination, under written terms of any Company employee benefit plan;

Claims for indemnification under the Company’s Bylaws, , California Labor 

(v) 
Code Section 2802 or any other applicable law; and

Executive’s right to bring to the attention of the Equal Employment Opportunity 

(vi) 
Commission claims of discrimination; provided, however, that Executive does release 
Executive’s right to secure any damages for alleged discriminatory treatment.

(c)  EXECUTIVE ACKNOWLEDGES THAT EXECUTIVE HAS BEEN ADVISED OF 
AND IS FAMILIAR WITH THE PROVISIONS OF CALIFORNIA CIVIL CODE SECTION 
1542, WHICH PROVIDES AS FOLLOWS:

“A GENERAL RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE CREDITOR 
DOES NOT KNOW OR SUSPECT TO EXIST IN HIS OR HER FAVOR AT THE TIME OF 
EXECUTING THE RELEASE, WHICH, IF KNOWN BY HIM OR HER, MUST HAVE 
MATERIALLY AFFECTED HIS OR HER SETTLEMENT WITH THE DEBTOR.”

(d)  BEING AWARE OF SAID CODE SECTION, EXECUTIVE EXPRESSLY WAIVES 

ANY RIGHTS EXECUTIVE MAY HAVE THEREUNDER, AS WELL AS UNDER ANY 
OTHER STATUTES OR COMMON LAW PRINCIPLES OF SIMILAR EFFECT.

7. 

Non-Disparagement, Transition, Transfer of Company Property and Limitations on 

Service.  Executive further agrees that:

(a)  Non-Disparagement.  Executive agrees that he shall not disparage, criticize or defame the 

Company, its affiliates and their respective affiliates, directors, officers, agents, partners, 
stockholders, employees, products, services, technology or business, either publicly or privately.  
The Company agrees that it shall not, and it shall instruct its officers and members of its Board 
of Directors to not, disparage, criticize or defame Executive, either publicly or privately.  
Nothing in this Section 7(a) shall have application to any evidence or testimony required by any 
court, arbitrator or government agency.

4

(b)  Transition.  Each of the Company and Executive shall use their respective reasonable 
efforts to cooperate with each other in good faith to facilitate a smooth transition of Executive’s 
duties to other executive(s) of the Company.

(c)  Transfer of Company Property.  On or before the Termination Date, Executive shall turn 
over to the Company all files, memoranda, records, and other documents, and any other physical 
or personal property which are the property of the Company and which he has in his possession, 
custody or control on the Termination Date.

8. 

Executive Representations.  Executive warrants and represents that (a) he has not filed or 

authorized the filing of any complaints, charges or lawsuits against the Company or any affiliate of the 
Company with any governmental agency or court, and that if, unbeknownst to Executive, such a 
complaint, charge or lawsuit has been filed on his behalf, he will immediately cause it to be withdrawn 
and dismissed, (b) he has reported all hours worked as of the date of this Agreement and has been paid 
all compensation, wages, bonuses, commissions, and/or benefits to which he may be entitled and no 
other compensation, wages, bonuses, commissions and/or benefits are due to him, except as provided in 
this Agreement, (c) he has no known workplace injuries or occupational diseases and has been provided 
and/or has not been denied any leave requested under the Family and Medical Leave Act or any similar 
state law, (d) the execution, delivery and performance of this Agreement by Executive does not and will 
not conflict with, breach, violate or cause a default under any agreement, contract or instrument to 
which Executive is a party or any judgment, order or decree to which Executive is subject, and (e) upon 
the execution and delivery of this Agreement by the Company and Executive, this Agreement will be a 
valid and binding obligation of Executive, enforceable in accordance with its terms.  

9. 

No Assignment by Executive.  Executive warrants and represents that no portion of any 

of the matters released, and no portion of any recovery or settlement to which Executive might be 
entitled, has been assigned or transferred to any other person, firm or corporation not a party to this 
Agreement, in any manner, including by way of subrogation or operation of law or otherwise.  If any 
claim, action, demand or suit should be made or instituted against the Company or any other Releasee 
because of any actual assignment, subrogation or transfer by Executive, Executive agrees to indemnify 
and hold harmless the Company and all other Releasees against such claim, action, suit or demand, 
including necessary expenses of investigation, attorneys’ fees and costs.  In the event of Executive’s 
death, this Agreement shall inure to the benefit of Executive and Executive’s executors, administrators, 
heirs, distributees, devisees, and legatees.  None of Executive’s rights or obligations may be assigned or 
transferred by Executive, other than Executive’s rights to payments under this Agreement, which may be 
transferred only upon Executive’s death by will or operation of law.  

10. 

Governing Law.  This Agreement shall be construed and enforced in accordance with, 

and the rights of the parties shall be governed by, the laws of the State of California or, where 
applicable, United States federal law, in each case, without regard to any conflicts of laws provisions or 
those of any state other than California.

11.  Miscellaneous.  This Agreement, collectively with the Confidentiality Agreement, the 

Release of Claims and the agreements evidencing the outstanding equity awards, constitutes the entire 
agreement between the parties with regard to its subject matter and supersedes, in their entirety, any 
other agreements between Executive and the Company with regard to its subject matter. Executive 
acknowledges that there are no other agreements, written, oral or implied, and that he may not rely on 
any prior negotiations, discussions, representations or agreements.  This Agreement may be modified 
only in writing, and such writing must be signed by Executive and an authorized officer or director of 
the Company and recited that it is intended to modify this Agreement.  This Agreement may be executed 
5

in separate counterparts, each of which is deemed to be an original and all of which taken together 
constitute one and the same agreement.  

12. 

Company Assignment and Successors.  The Company shall assign its rights and 

obligations under this Agreement to any successor to all or substantially all of the business or the assets 
of the Company (by merger or otherwise).  This Agreement shall be binding upon and inure to the 
benefit of the Company and its successors, assigns, personnel and legal representatives.    

13.  Maintaining Confidential Information.  Executive reaffirms his obligations under his 

Confidentiality Agreement.  Executive acknowledges and agrees that the accelerated vesting provided in 
Section 4 shall be subject to Executive’s continued compliance with Executive’s obligations under the 
Confidentiality Agreement.  

14. 

Executive’s Cooperation.  After the Termination Date, Executive shall cooperate with the 

Company and its affiliates, upon the Company’s reasonable request, with respect to any internal 
investigation or administrative, regulatory or judicial proceeding involving matters within the scope of 
Executive’s duties and responsibilities to the Company or its affiliates during his employment with the 
Company (including, without limitation, Executive being available to the Company upon reasonable 
notice for interviews and factual investigations, appearing at the Company’s reasonable request to give 
testimony without requiring service of a subpoena or other legal process, and turning over to the 
Company all relevant Company documents which are or may have come into Executive’s possession 
during his employment); provided, however, that any such request by the Company shall not be unduly 
burdensome or interfere with Executive’s personal schedule or ability to engage in gainful employment.   

DATED: February 6, 2013

DATED: February 6, 2013

 /s/ Roger Weingarth                     
Roger Weingarth

CALIX, INC.
 /s/ Mimi Gigoux                           
By: Mimi Gigoux

6

EXHIBIT A

GENERAL RELEASE OF CLAIMS

This General Release of Claims (“Release”) is entered into as of _________________, 

2014, between Roger Weingarth (“Executive”) and Calix, Inc., a Delaware corporation (the 
“Company”) (collectively referred to as the “Parties”), effective eight days after Executive’s 
signature of this Release (“Effective Date”), unless Executive revokes his acceptance of this 
Release as provided in Paragraph 1(c), below.

1. 

Executive’s Release of the Company.  Executive understands that by agreeing to 
this Release, Executive is agreeing not to sue, or otherwise file any claim against, the Company 
or any of its employees or other agents for any reason whatsoever based on anything that has 
occurred as of the date Executive signs this Release.

(a)  On behalf of Executive and Executive’s heirs, assigns, executors, administrators, 

trusts, spouse and estate, Executive releases and forever discharges the “Releasees,” 
consisting of the Company, and each of its owners, affiliates, subsidiaries, predecessors, 
successors, assigns, agents, directors, officers, partners, employees, and insurers, and all 
persons acting by, through, under or in concert with them, or any of them, of and from 
any and all manner of action or actions, cause or causes of action, in law or in equity, 
suits, debts, liens, contracts, agreements, promises, liability, claims, demands, damages, 
loss, cost or expense, of any nature whatsoever, known or unknown, fixed or contingent 
(“Claims”), which Executive now has or may later have against the Releasees, or any of 
them, by reason of any matter, cause, or thing whatsoever from the beginning of time to 
the Effective Date, including, without limitation, any Claims arising out of, based upon, 
or relating to Executive’s hire, employment, remuneration or resignation by the 
Releasees, or any of them, including Claims arising under federal, state, or local laws 
relating to employment, Claims of any kind that may be brought in any court or 
administrative agency, any Claims arising under the Age Discrimination in Employment 
Act (“ADEA”), 29 U.S.C. § 621, et seq.; Title VII of the Civil Rights Act of 1964, as 
amended by the Civil Rights Act of 1991, 42 U.S.C. § 2000 et seq.; the Equal Pay Act, 29 
U.S.C. § 206(d); the Civil Rights Act of 1866, 42 U.S.C. § 1981; the Family and Medical 
Leave Act of 1993, 29 U.S.C. § 2601 et seq.; the Americans with Disabilities Act of 1990, 
42 U.S.C. § 12101 et seq.; the False Claims Act , 31 U.S.C. § 3729 et seq.; the Employee 
Retirement Income Security Act, 29 U.S.C. § 1001 et seq.; the Worker Adjustment and 
Retraining Notification Act, 29 U.S.C.  § 2101 et seq. the Fair Labor Standards Act, 29 
U.S.C. § 215 et seq., the Sarbanes-Oxley Act of 2002; the California Labor Code; the 
employment and civil rights laws of California; Claims for breach of contract; Claims 
arising in tort, including, without limitation, Claims of wrongful dismissal or discharge, 
discrimination, harassment, retaliation, fraud, misrepresentation, defamation, libel, 
infliction of emotional distress, violation of public policy, and/or breach of the implied 
covenant of good faith and fair dealing; and Claims for damages or other remedies of any 
sort, including, without limitation, compensatory damages, punitive damages, injunctive 
relief and attorney’s fees.  .

1

 
(b)  Executive does not release the following claims:

Claims for unemployment compensation or any state disability insurance 

(i) 
benefits under the terms of applicable state law; 

Claims for workers’ compensation insurance benefits under the terms of 

(ii) 
any worker’s compensation insurance policy or fund of the Company;

(iii)  Claims to continued participation in certain of the Company’s group 
benefit plans under the terms and conditions of COBRA;

Claims to any benefit entitlements vested as the date of Executive’s 
(iv) 
employment termination, under written terms of any Company employee benefit 
plan;

Claims for indemnification under the Company’s Bylaws, California 

(v) 
Labor Code Section 2802 or any other applicable law; and

Executive’s right to bring to the attention of the Equal Employment 
(vi) 
Opportunity Commission claims of discrimination; provided, however, that 
Executive does release Executive’s right to secure any damages for alleged 
discriminatory treatment.

(c)  In accordance with the Older Workers Benefit Protection Act of 1990, Executive 

has been advised of the following:

Executive has the right to consult with an attorney before signing this 

(i) 
Release;

(ii) 

Executive has been given at least 21 days to consider this Release;

Executive has seven days after signing this Release to revoke it, and 

(iii) 
Executive will not receive the severance benefits provided by Section 4 of that 
certain Transition and Separation Agreement entered into between the Parties as 
of February 6, 2013 (“Transition and Separation Agreement”) unless and until 
such seven-day period has expired.  If Executive wishes to revoke this Release, 
Executive must deliver notice of Executive’s revocation in writing, no later than 
5:00 p.m. Pacific Time on the 7th day following Executive’s execution of this 
Release to [______________], fax: [_____________].

(d)  EXECUTIVE ACKNOWLEDGES THAT EXECUTIVE HAS BEEN ADVISED 

OF AND IS FAMILIAR WITH THE PROVISIONS OF CALIFORNIA CIVIL CODE 
SECTION 1542, WHICH PROVIDES AS FOLLOWS:

“A GENERAL RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE 
CREDITOR DOES NOT KNOW OR SUSPECT TO EXIST IN HIS OR HER 
FAVOR AT THE TIME OF EXECUTING THE RELEASE, WHICH, IF 

2

KNOWN BY HIM OR HER, MUST HAVE MATERIALLY AFFECTED HIS 
OR HER SETTLEMENT WITH THE DEBTOR.” 

BEING AWARE OF SAID CODE SECTION, EXECUTIVE EXPRESSLY WAIVES 
ANY RIGHTS EXECUTIVE MAY HAVE THEREUNDER, AS WELL AS UNDER 
ANY OTHER STATUTES OR COMMON LAW PRINCIPLES OF SIMILAR EFFECT.

2.  Executive Representations.  Executive represents and warrants that:

(a)  Executive has returned to the Company all Company property in Executive’s 

possession;

(b)  Executive is not owed wages, commissions, bonuses or other compensation, other 
than the accelerated vesting which provided in Section 4 of the Transition and Separation 
Agreement;

(c)  During the course of Executive’s employment Executive did not sustain any 

injuries for which Executive might be entitled to compensation under worker’s 
compensation law or Executive has disclosed any injuries of which he is currently, 
reasonably aware for which he might be entitled to compensation under worker’s 
compensation law;

(d)  From the date Executive executed the Transition and Separation Agreement 

through the date Executive executes this Release, Executive has not made any 
disparaging comments about the Company, nor will Executive do so in the future; and

(e)  Executive has not initiated any adversarial proceedings of any kind against the 
Company or against any other person or entity released, nor will Executive do so in the 
future, except as specifically allowed by this Release.

3. 

Maintaining Confidential Information.  Executive reaffirms his obligations under 
that certain that certain Confidential Information and Invention Assignment Agreement entered 
into between Executive and the Company effective as of March 3, 2003, as may be amended 
from time to time (“Confidentiality Agreement”).  Executive acknowledges and agrees that the 
accelerated vesting provided in Section 4 of the Transition and Separation Agreement shall be 
subject to Executive’s continued compliance with Executive’s obligations under the 
Confidentiality Agreement.  

4. 

Cooperation with the Company.  Executive reaffirms his obligations to cooperate 

with the Company under Section 14 of the Transition and Separation Agreement.  

5. 

Severability.  The provisions of this Release are severable.  If any provision is 

held to be invalid or unenforceable, it shall not affect the validity or enforceability of any other 
provision.

3

6. 

Choice of Law.  This Release shall in all respects be governed and construed in 

accordance with the laws of the State of California, including all matters of construction, validity 
and performance, without regard to conflicts of law principles.

7. 

Integration Clause.  This Release and the Transition and Separation Agreement 
contain the Parties’ entire agreement with regard to the transition and separation of Executive’s 
employment, and supersede and replace any prior agreements as to those matters, whether oral or 
written. This Release may not be changed or modified, in whole or in part, except by an 
instrument in writing signed by Executive and the Chief Executive Officer of the Company.

8. 

Execution in Counterparts.  This Release may be executed in counterparts with 

the same force and effectiveness as though executed in a single document.  Facsimile signatures 
shall have the same force and effectiveness as original signatures.

9. 

Intent to be Bound.  The Parties have carefully read this Release in its entirety; 
fully understand and agree to its terms and provisions; and intend and agree that it is final and 
binding on all Parties.

EXECUTIVE

CALIX, INC.

Roger Weingarth

By:  Mimi Gigoux
Title: Senior Vice President, Talent and Culture

Date:                                        

Date:                                          

4

                                                
                                                   
SUBSIDIARIES OF THE REGISTRANT

Exhibit 21.1

Entity Name
Calix Networks Canada, Inc.
Calix Network Technology Development (Nanjing) Co. Ltd.
Calix Networks UK, Ltd                          
Calix Brasil Servicos Ltda
Occam Networks, LLC
Occam Networks (California), Inc.

Jurisdiction
Canada
China
England, UK
Brazil
Delaware, United States
California, United States

  
  
  
  
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Exhibit 23.1

We consent to the incorporation by reference in the Registration Statement (Form S-8 Nos. 333-185025, 333-172379, and 
333-166245) of Calix, Inc. of our reports dated February 21, 2013, with respect to the consolidated financial statements and 
schedule of Calix, Inc., and the effectiveness of internal control over financial reporting of Calix, Inc. included in this Annual 
Report (Form 10-K) for the year ended December 31, 2012. 

San Francisco, California
February 21, 2013 

/s/ ERNST & YOUNG LLP

CERTIFICATION OF CHIEF EXECUTIVE OFFICER
PURSUANT TO SECTION 302 OF
THE SARBANES-OXLEY ACT OF 2002

Exhibit 31.1

I, Carl Russo, certify that:

1. 

2. 

3. 

4. 

I have reviewed this annual report on Form 10-K of Calix, Inc. for the year ended December 31, 2012;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material 
fact necessary to make the statements made, in light of the circumstances under which such statements were made, not 
misleading with respect to the period covered by this report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly 
present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and 
for, the periods presented in this report;

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and 
procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting 
(as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)  Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be 
designed under our supervision, to ensure that material information relating to the registrant, including its 
consolidated subsidiaries, is made known to us by others within those entities, particularly during the period 
in which this report is being prepared;

(b)  Designed such internal control over financial reporting, or caused such internal control over financial 

reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of 
financial reporting and the preparation of financial statements for external purposes in accordance with 
generally accepted accounting principles;

(c)  Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report 
our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period 
covered by this report based on such evaluation; and

(d)  Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred 

during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual 
report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control 
over financial reporting;

5. 

The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control 
over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or 
persons performing the equivalent functions):

(a)  All significant deficiencies and material weaknesses in the design or operation of internal control over 

financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, 
summarize and report financial information; and

(b)  Any fraud, whether or not material, that involves management or other employees who have a significant role 

in the registrant’s internal control over financial reporting.

Date: February 21, 2013

/s/ Carl Russo

  Carl Russo
  Chief Executive Officer

 
 
 
 
 
CERTIFICATION OF CHIEF FINANCIAL OFFICER
PURSUANT TO SECTION 302 OF
THE SARBANES-OXLEY ACT OF 2002

Exhibit 31.2

I, Michael Ashby, certify that:

1. 

2. 

3. 

4. 

I have reviewed this annual report on Form 10-K of Calix, Inc. for the year ended December 31, 2012;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material 
fact necessary to make the statements made, in light of the circumstances under which such statements were made, not 
misleading with respect to the period covered by this report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly 
present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and 
for, the periods presented in this report;

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and 
procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting 
(as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)  Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be 
designed under our supervision, to ensure that material information relating to the registrant, including its 
consolidated subsidiaries, is made known to us by others within those entities, particularly during the period 
in which this report is being prepared;

(b)  Designed such internal control over financial reporting, or caused such internal control over financial 

reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of 
financial reporting and the preparation of financial statements for external purposes in accordance with 
generally accepted accounting principles;

(c)  Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report 
our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period 
covered by this report based on such evaluation; and

(d)  Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred 

during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual 
report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control 
over financial reporting;

5. 

The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control 
over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or 
persons performing the equivalent functions):

(a)  All significant deficiencies and material weaknesses in the design or operation of internal control over 

financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, 
summarize and report financial information; and

(b)  Any fraud, whether or not material, that involves management or other employees who have a significant role 

in the registrant’s internal control over financial reporting.

Date: February 21, 2013

/s/ Michael Ashby

  Michael Ashby
  Chief Financial Officer

 
 
 
 
 
CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER
PURSUANT TO 18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Carl Russo, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 
2002, that the Annual Report of Calix, Inc. (the “Company”) on Form 10-K for the fiscal year ended December 31, 2012 fully 
complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information 
contained in such Annual Report on Form 10-K fairly presents in all material respects the financial condition and results of 
operations of the Company.

Exhibit 32.1

Date: February 21, 2013

/s/ Carl Russo

  Carl Russo
  Chief Executive Officer

I, Michael Ashby, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 
2002, that the Annual Report of Calix, Inc. (the “Company”) on Form 10-K for the fiscal year ended December 31, 2012 fully 
complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information 
contained in such Annual Report on Form 10-K fairly presents in all material respects the financial condition and results of 
operations of the Company.

Date: February 21, 2013

/s/ Michael Ashby

  Michael Ashby
  Chief Financial Officer

This certification accompanies the Form 10-K to which it relates, is not deemed filed with the Securities and Exchange 

Commission and is not to be incorporated by reference into any filing of Calix, Inc. under the Securities Act of 1933, as 
amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-K), 
irrespective of any general incorporation language contained in such filing.