DZS INC. - Annual Report: 2007 (Form 10-K)

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

For the fiscal year ended December 31, 2007

OR

For the transition period from          to         

Commission File Number: 000-32743

ZHONE TECHNOLOGIES, INC.

(Exact name of registrant as specified in its charter)

7001 Oakport Street

Oakland, California 94621

(Address of principal executive office)

Registrant’s telephone number, including area code: (510) 777-7000

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

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ¨     No x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act. Yes ¨    No x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Exchange Act 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 x    No ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K 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. x

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 definitions of “accelerated filer,” “large accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act (Check one):

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ¨    No x

As of January 31, 2008, there were 150,025,274 shares outstanding of the registrant’s common stock, $0.001 par value. As of June 30, 2007 (the last business day of the registrant’s most recently completed second fiscal quarter), the aggregate market value of common stock held by non-affiliates of the registrant was approximately $159,112,000.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive Proxy Statement for the 2008 Annual Meeting of Stockholders are incorporated by reference into Part III of this Form 10-K where indicated.

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Forward-looking Statements

This Annual Report on Form 10-K, including “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 and the Securities Exchange Act of 1934. 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. We use words such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “goal,” “intend,” “may,” “plan,” “project,” “seek,” “should,” “target,” “will,” “would,” variations of such words and similar expressions to identify forward-looking statements. In addition, statements that refer to projections of earnings, revenue, costs or other financial items; anticipated growth and trends in our business or key markets; future growth and revenues from our Single Line Multi-Service (SLMS) products; future economic conditions and performance; anticipated performance of products or services; plans, objectives and strategies for future operations; 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 under the heading “Risk Factors” in Item 1A, elsewhere in this report and our other filings with the SEC. Therefore, actual results may differ materially and adversely from those expressed in any forward-looking statements. We undertake no obligation to revise or update any forward-looking statements for any reason.

PART I

ITEM 1.    BUSINESS

Company Overview

We design, develop and manufacture communications network equipment for telephone companies and cable operators worldwide. We believe that these network service providers can increase their revenues and lower their operating costs by using our products to deliver video and interactive entertainment services in addition to their existing voice and data service offerings, all on a platform that permits a seamless migration from legacy technologies to a converged packet-based architecture. Our Single Line Multi-Service (SLMS) architecture provides cost-efficiency and feature flexibility with support for voice over internet protocol (VoIP) and IP video (IPTV). Within this versatile SLMS architecture, our products allow service providers to deliver all of these converged packet services over their existing copper lines while providing support for fiber build-out. With our products, network service providers can seamlessly migrate from traditional circuit-based networks to packet-based networks and from copper-based access lines to fiber-based access lines without abandoning the investments they have made in their existing infrastructures.

Corporate Information

We were incorporated in Delaware under the name Zhone Technologies, Inc. in June 1999, and in November 2003, we consummated our merger with Tellium, Inc. Although Tellium acted as the legal acquirer, due to various factors, including the relative voting rights, board control and senior management composition of the combined company, Zhone was treated as the “acquirer” for accounting purposes. Following the merger, the combined company was renamed Zhone Technologies, Inc. and retained substantially all of Zhone’s previous management and operating structure. The mailing address of our worldwide headquarters is 7001 Oakport Street, Oakland, California 94621, and our telephone number at that location is (510) 777-7000. Our website address is www.zhone.com. The information on our website does not constitute part of this report. Through a link on the Investor Relations section of our website, we make available the following filings as soon as reasonably practicable after they are electronically filed with or furnished to the SEC: our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and any amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934. All such filings are available free of charge.

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Industry Background

Over the past several years, the communications network industry has experienced rapid expansion as the internet and the proliferation of bandwidth intensive applications and services have led to an increased demand for high bandwidth communications networks. The broad adoption of new technologies such as MP3 players, digital cameras and high definition televisions allow music, pictures, user-generated content (as found on the many video-sharing sites) and high definition video to be a growing part of consumers’ regular exchange of information. All of these new technologies share a common dependency on high bandwidth communication networks and sophisticated traffic management tools. However, network service providers have struggled to meet the increased demand for high speed broadband access due to the constraints of the existing communications network infrastructure. This infrastructure consists of two interconnected networks:

To address the increased demand for higher transmission speeds via greater bandwidth, service providers have expended significant capital over the past decade to upgrade the core network by replacing much of their copper infrastructure with high-speed optical infrastructure. While the use of fiber optic equipment in the core network has relieved the bandwidth capacity constraints in the core network between service providers, the access network continues to be a “bottleneck” that severely limits the transmission speed between service providers and end-users. As a result, communications in the core network can travel at up to 10 gigabits per second, while in stark contrast, many communications over the access network throughout the world still occur at a mere 56 kilobits per second, a speed that is 175,000 times slower. At 56 kilobits per second, it may take several minutes to access even a modestly media laden website and several hours to download large files. Fiber access lines have the potential to remedy this disparity, but re-wiring every home or business with fiber optic cable is both cost prohibitive and extremely time consuming. Consequently, solving the access network bottleneck has typically required more efficient use of the existing copper wire infrastructure and support for the gradual migration from copper to fiber.

In an attempt to deliver high bandwidth services over existing copper wire in the access network, service providers began deploying digital subscriber line (DSL) technology over a decade ago. However, this early DSL technology has practical limitations. Copper is a distance sensitive medium in that the amount of bandwidth available over a copper wire is inversely proportional to the length of the copper wire. In other words, the greater the distance between the service provider’s equipment and the customer’s premises, the lower the bandwidth. Unfortunately, most DSL services available today are provided by first generation DSL access multiplexer (DSLAM) equipment. These large unwieldy devices require conditioned power and a climate controlled environment typically found only in a telephone company’s central office, which is often at great distance from the customer. While adequate for basic data services, these first generation DSLAMs were not designed to meet the needs of today’s high bandwidth applications. The modest bandwidth provided by existing DSLAM equipment is often incapable of delivering even a single channel of standard definition video, much less multiple channels of standard definition video or high definition video.

More recently, regulatory changes have introduced new competitors in the telecommunication services industry. Cable operators, with extensive networks designed originally to provide only video programming, have collaborated to adopt new packet technologies that leverage their hybrid fiber/coaxial cable infrastructure. Using more recent technologies, cable operators have begun to cost-effectively deliver new service bundles. The new service offerings provide not only enhanced features and capabilities, but also allow the cable operators to deliver these services over a common network. The resulting cost-efficiencies realized by cable operators are difficult for incumbent telephone companies to match. Even with the telephone companies’ legacy voice switches fully paid for, maintaining separate networks for their circuit-based voice and packet-based video and data networks is operationally non-competitive. Perhaps even more important than economic efficiencies, by integrating these services over a common packet infrastructure, cable operators will realize levels of integration between

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applications and new features that will be difficult to achieve from a multi-platform solution. Despite these benefits, coaxial cable has its own share of limitations. Unlike DSL, coaxial cable shares its bandwidth among all customers connected to it. Consequently, as new customers are added to coaxial cable networks, performance decreases. As a shared medium, large numbers of subscribers who simultaneously access the same segment of the coaxial cable network can potentially compromise performance and security. This represents a source of strategic advantage for telecom operators who employ technology designed to maximize their service capabilities on the point-to-point (i.e. not shared) architecture of their copper infrastructure. This increased competition has placed significant pressure on all network service providers. With significant service revenues at risk, these service providers have started to make investments to upgrade their networks and broaden their service offerings. In response to these competitive pressures, existing service providers have commenced a search for ways to modernize their legacy networks, to enable delivery of additional high bandwidth, high margin services, and to lower the cost of delivering these services.

The Zhone Solution

We believe that we are the first company dedicated solely to developing the full spectrum of next-generation access network solutions to cost-effectively deliver high bandwidth services while simultaneously preserving the investment in today’s networks. Our next-generation solutions are based upon our Single Line Multi-Service, or SLMS, architecture. From its inception, this SLMS architecture was specifically designed for the delivery of multiple classes of subscriber services (such as voice, data and video distribution), rather than being based on a particular protocol or media. In other words, our SLMS products are built to support the migration from legacy circuit to packet technologies and from copper to fiber technologies. This flexibility and versatility allows our products to adapt to future technologies while allowing service providers to focus on the delivery of additional high bandwidth services. Because this SLMS architecture is designed to interoperate with existing legacy equipment, service providers can leverage their existing networks to deliver a combination of voice, data and video services today, while they migrate, either simultaneously or at a future date, from legacy equipment to next-generation equipment with minimal interruption. We believe that our SLMS solution provides an evolutionary path for service providers using their existing infrastructures, as well as giving newer service providers the capability to deploy cost-effective, multi-service networks that can support voice, data and video.

Triple Play Services with Converged Voice, Data and Video – SLMS simplifies the access network by consolidating new and existing services onto a single line. This convergence of services and networks simplifies provisioning and operations, ensures quality of service and reliability, and reduces the time required to provide services. SLMS integrates access, transport, customer premises equipment, and management functions in a standards-based system that provides scalability, interoperability and functionality for voice, data and video services.

Packet Migration – SLMS is a flexible multi-service architecture that provides current services while simultaneously supporting migration to a pure packet network. This flexibility allows service providers to cost-effectively provide carrier class performance, and functionality for current and future services without interrupting existing services or abandoning existing subscribers. SLMS also protects the value of the investments made by residential and commercial subscribers in equipment, inside wiring and applications, thereby minimizing transition impact and subscriber attrition.

Fiber to the Home, Premise, Node, or Curb (FTTx) — We provide support for the full range of fiber-based access network architectures that are seeing increased use by today’s carriers. In many markets worldwide, both business and residential demand for bandwidth is growing to the point where the deployment of fiber in the access network is increasingly desirable. Where copper loops are plentiful and where civil restrictions make fiber deployment all the way to the customer premises prohibitively expensive, if not impossible, many operators are choosing to deploy fiber from central offices to neighborhoods and then using VDSL2 over copper to deliver broadband connectivity over the last hundred meters or so. In other circumstances operators choose to deploy passive optical networks (PON) all the way to the customer premises, where a single fiber’s bandwidth is shared

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through splitters with up to 64 subscribers. Some circumstances demand so-called “home run” fiber networks (with dedicated fiber resources linking every customer directly to the central office) to maximize bandwidth or service segmentation. By supporting all these architectures within a common SLMS-based platform, we provide carriers maximum flexibility to build the network that best suits their needs.

Ethernet Service Delivery – We offer a complete array of equipment that allows carriers to deliver ethernet services over copper or fiber. For business subscribers, our ethernet over copper product family allows carriers to quickly deliver ethernet services over existing copper SHDSL or T1/E1 circuits. Multiple circuits can be bonded to provide over 70 Megabits per second, enough to deliver ample ethernet bandwidth to satisfy business subscribers’ growing service requirements. This copper-based solution provides a compelling alternative to burying fiber and dedicating valuable fiber strands to long-haul ethernet services to small and medium enterprises.

The Zhone Strategy

Our strategy has been to combine internal development with acquisitions of established access equipment vendors to achieve the critical mass required of telecommunications equipment providers. We expect that our future growth will focus primarily on organic growth in emerging technology markets. Going forward, the key elements of our strategy include:

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Product Portfolio

Our products provide the framework around which we are designing and developing high speed communications software and equipment for the access network. All of the products listed below are currently available and being shipped to customers. Our products span two distinct categories:

SLMS Products

Our SLMS products address three areas of customer requirements. Our Broadband Aggregation and Service products aggregate, concentrate and optimize communications traffic from copper and fiber networks. These products are deployed in central offices, remote offices, points of presence, curbsides, data and co-location centers, and large enterprises. Our Customer Premise Equipment, or CPE, products offer a cost-effective solution for combining analog voice and data services to the subscriber’s premises over a single platform. The Zhone Management System, or ZMS, product provides optional software tools to help manage aggregation and customer premises network hardware. These products deliver voice, data and video interface connectivity for broadcast and subscription television, internet routers and traditional telephony equipment.

Our SLMS products include:

Legacy, Service and Other Products

Our legacy products support a variety of voice and data services, and are broadly deployed by service providers worldwide. Our legacy products during 2007 and 2006 included:

In December 2006, we sold our legacy iMarc product line, in December 2007, we sold our legacy Access Node product line and in January 2008, we sold our legacy GigaMux product line.

Global Service & Support

In addition to our product offerings, we provide a broad range of service offerings through our Global Service & Support organization. We supplement our standard and extended product warranties with programs that offer technical support, product repair, education services and enhanced support services. These services enable our customers to protect their network investments, manage their networks more efficiently and minimize downtime for mission-critical systems. Technical support services are designed to help ensure that our products operate efficiently, remain highly available, and benefit from recent software releases. Through our education services program, we offer in-depth training courses covering network design, installation, configuration, operation, trouble-shooting and maintenance. Our enhanced services offering is a comprehensive program that provides network engineering, configuration, integration, project management and other consultative support to

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maximize the results of our customers during the design, deployment and operational phases. As part of our commitment to ensure around-the-clock support, we maintain a technical assistance center and a staff of qualified network support engineers to provide customers with 24-hour service, seven days a week.

Technology

We believe that our future success is built upon our investment in the development of advanced technologies. SLMS is based on a number of technologies that provide sustainable advantages, including the following:

Customers

We sell our products and services to network service providers that offer voice, data and video services to businesses, governments, utilities and residential consumers. Our global customer base includes regional, national and international telecommunications carriers, as well as leading cable service providers. To date, our products are deployed by over 600 network service providers on six continents worldwide. No customer accounted for 10% or more of total revenue in 2007 or 2006.

Research and Development

The industry in which we compete is subject to rapid technological developments, evolving industry standards, changes in customer requirements, and continuing developments in communications service offerings. Our continuing ability to adapt to these changes, and to develop new and enhanced products, is a significant factor in maintaining or improving our competitive position and our prospects for growth. Therefore, we continue to make significant investments in product development.

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We conduct the majority of our research and product development activities at our Oakland, California campus. In Oakland, we have built an extensive communications laboratory with hundreds of access infrastructure products from multiple vendors that serve as an interoperability and test facility. This facility allows us to emulate a communications network with serving capacity equivalent to that supporting a city of 350,000 residents. We also have focused engineering staff and activities at additional development centers located in Alpharetta, Georgia, Largo, Florida, Westlake Village, California, and Portsmouth, New Hampshire.

Our product development activities focus on products to support both existing and emerging technologies in the segments of the communications industry that we consider viable revenue opportunities. We are actively engaged in continuing to refine our SLMS architecture, introducing new products under our SLMS architecture, and creating additional interfaces and protocols for both domestic and international markets.

We continue our commitment to invest in leading edge technology research and development. Our research and product development expenditures were $32.7 million, $36.1 million, and $27.1 million in 2007, 2006 and 2005, respectively. All of our expenditures for research and product development costs, as well as stock-based compensation expense relating to research and product development, have been expensed as incurred. These amounts include stock-based compensation of $0.7 million and $1.6 million reported under Statement of Financial Accounting Standards No. 123 (revised 2004), Share-Based Payment (SFAS 123R) for 2007 and 2006, respectively, and $0.2 million reported under APB 25 for 2005. In addition, we also charged to expense purchased in-process research and development relating to acquisitions of $1.2 million in 2005. We plan to continue to support the development of new products and features, while seeking to carefully manage associated costs through expense controls.

Intellectual Property

We seek to establish and maintain our proprietary rights in our technology and products through the use of patents, copyrights, trademarks and trade secret laws. We also seek to maintain our trade secrets and confidential information by nondisclosure policies and through the use of appropriate confidentiality agreements. We have obtained a number of patents and trademarks in the United States and in other countries. There can be no assurance, however, that these rights can be successfully enforced against competitive products in every jurisdiction. Although we believe the protection afforded by our patents, copyrights, trademarks and trade secrets has value, the rapidly changing technology in the networking industry and uncertainties in the legal process make our future success dependent primarily on the innovative skills, technological expertise, and management abilities of our employees rather than on the protection afforded by patent, copyright, trademark, and trade secret laws. In addition, during 2007 and 2006, we sold certain of our non-strategic patents for $5 million and $9 million, respectively.

Many of our products are designed to include software or other intellectual property licensed from third parties. While it may be necessary in the future to seek or renew licenses relating to various aspects of our products, we believe, based upon past experience and standard industry practice, that such licenses generally could be obtained on commercially reasonable terms. Nonetheless, there can be no assurance that the necessary licenses would be available on acceptable terms, if at all. Our inability to obtain certain licenses or other rights or to obtain such licenses or rights on favorable terms, or the need to engage in litigation regarding these matters, could have a material adverse effect on our business, operating results and financial condition.

The communications industry is characterized by rapidly changing technology, a large number of patents, and frequent claims and related litigation regarding patent and other intellectual property rights. We cannot assure you that our patents and other proprietary rights will not be challenged, invalidated or circumvented, that others will not assert intellectual property rights to technologies that are relevant to us, or that our rights will give us a competitive advantage. In addition, the laws of some foreign countries may not protect our proprietary rights to the same extent as the laws of the United States.

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Sales and Marketing

We have a sales presence in various domestic and foreign locations, and we sell our products and services both directly and indirectly through channel partners with support from our sales force. Channel partners include distributors, resellers, system integrators and service providers. These partners sell directly to end customers and often provide system installation, technical support, professional services and support services in addition to the network equipment sale. Our sales efforts are generally organized according to geographical regions:

Our marketing team works closely with our sales, research and product development organizations, and our customers by providing communications that keep the market current on our products and features. Marketing also identifies and sizes new target markets for our products, creates awareness of our company and products, generates contacts and leads within these targeted markets and performs outbound education and public relations.

Backlog

Our backlog consists of purchase orders for products and services that we expect to ship or perform within the next year. At December 31, 2007, our backlog was $14.0 million, as compared to $5.5 million at December 31, 2006. We consider backlog to be an indicator, but not the sole predictor, of future sales because our customers may cancel or defer orders without penalty.

Competition

We compete in the communications equipment market, providing products and services for the delivery of voice, data and video services. This market is characterized by rapid change, converging technologies and a migration to solutions that offer superior advantages. These market factors represent both an opportunity and a competitive threat to us. We compete with numerous vendors, including Alcatel-Lucent, Calix, Huawei, and Occam Networks, among others. In addition, a number of companies have introduced products that address the same network needs that our products address, both domestically and abroad. The overall number of our competitors may increase, and the identity and composition of competitors may change. As we continue to expand our sales globally, we may see new competition in different geographic regions. Barriers to entry are relatively low, and new ventures to create products that do or could compete with our products are regularly formed. Many of our competitors have greater financial, technical, sales and marketing resources than we do.

The principal competitive factors in the markets in which we presently compete and may compete in the future include:

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While we believe that we compete successfully with respect to each of these factors, we expect to face intense competition in our market. In addition, the inherent nature of communications networking requires interoperability. As such, we must cooperate and at the same time compete with many companies.

Manufacturing

Prior to the acquisition of Paradyne Networks, Inc., or Paradyne, in September 2005, we historically employed an outsourced manufacturing strategy that relied on contract manufacturers and in-house final assembly, test, and shipment. Since the acquisition of Paradyne, we have been manufacturing a significant majority of our products at our manufacturing facility in Florida.

Our parts and components are procured from a variety of qualified suppliers in the U.S., Far East, Mexico, and other countries around the world per our Approved Supplier List and detailed engineering specifications. We also acquire completed products from certain suppliers and configure and ship from our facility. Some of these purchases are significant. We purchase both standard off-the-shelf parts and components, which are generally available from more than one supplier, and single-source parts and components. We have generally been able to obtain adequate supplies to meet customer demand in a timely manner from our current vendors, or, when necessary, from alternate vendors. We believe that alternate vendors can be identified if current vendors are unable to fulfill our needs, or design changes can be made to employ alternate parts.

We design, specify, and monitor all of the tests that are required to meet our internal and external quality standards. Our manufacturing and test engineers work closely with our design engineers to ensure manufacturability and testability of our products, and to ensure that manufacturing and testing processes evolve as our technologies evolve. Our manufacturing engineers specify, build, or procure our test stations, establish quality standards and protocols, and develop comprehensive test procedures and processes to assure the reliability and quality of our products. These processes and tests are reviewed by our design engineers to ensure they meet the intent of the design. Products that are procured complete or partially complete are inspected, tested, and audited for quality control.

Our manufacturing quality system is ISO-9001 and is certified to ISO-9001 by our external registrar. ISO-9001 ensures our processes are documented, followed, and continuously improved. Internal audits are conducted on a regular schedule by our quality assurance personnel, and external audits are conducted by our external registrar every six months. Our quality system is based upon our model for quality assurance in design, development, production, installation, and service to ensure our products meet rigorous quality standards.

We believe that we have sufficient production capacity to meet current and future demand for our product offerings through a combination of existing and added capacity, additional employees, or the outsourcing of products or components.

Compliance with Regulatory and Industry Standards

Our products must comply with a significant number of voice and data regulations and standards which vary between the U.S. and international markets, and which vary between specific international markets. Standards for

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new services continue to evolve, and we may need to modify our products or develop new versions to meet these standards. Standards setting and compliance verification in the U.S. are determined by the Federal Communications Commission, or FCC, Underwriters Laboratories, Quality Management Institute, Telcordia Technologies, Inc., and other communications companies. In international markets, our products must comply with standards issued by the European Telecommunications Standards Institute, or ETSI, and implemented and enforced by the telecommunications regulatory authorities of each nation.

Environmental Matters

Our operations and manufacturing processes are subject to federal, state, local and foreign environmental protection laws and regulations. These laws and regulations relate to the use, handling, storage, discharge and disposal of certain hazardous materials and wastes, the pre-treatment and discharge of process waste waters and the control of process air pollutants.

We believe that our operations and manufacturing processes currently comply in all material respects with applicable environmental protection laws and regulations. If we fail to comply with any present and future regulations, we could be subject to future liabilities, the suspension of production or a prohibition on the sale of our products. In addition, such regulations could require us to incur other significant expenses to comply with environmental regulations, including expenses associated with the redesign of any non-compliant product. From time to time new regulations are enacted, and it is difficult to anticipate how such regulations will be implemented and enforced. For example, in 2003 the European Union enacted the Restriction on the Use of Certain Hazardous Substances in Electrical and Electronic Equipment Directive (RoHS) and the Waste Electrical and Electronic Equipment Directive (WEEE), for implementation in European Union member states. We are aware of similar legislation that is currently in force or is being considered in the United States, as well as other countries. Our failure to comply with any of such regulatory requirements or contractual obligations could result in our being liable for costs, fines, penalties and third-party claims, and could jeopardize our ability to conduct business in countries in the jurisdictions where these regulations apply.

Employees

As of December 31, 2007, we employed 461 individuals worldwide. We consider the relationships with our employees to be positive. Competition for technical personnel in our industry is intense. We believe that our future success depends in part on our continued ability to hire, assimilate and retain qualified personnel. To date, we believe that we have been successful in recruiting qualified employees, but there is no assurance that we will continue to be successful in the future.

Executive Officers

Set forth below is information concerning our executive officers and their ages as of December 31, 2007.

Morteza Ejabat is a co-founder of Zhone and has served as Chairman of the Board of Directors, President and Chief Executive Officer since June 1999. Prior to co-founding Zhone, from June 1995 to June 1999, Mr. Ejabat was President and Chief Executive Officer of Ascend Communications, Inc., a provider of telecommunications equipment which was acquired by Lucent Technologies, Inc. in June 1999. Previously, Mr. Ejabat held various senior management positions with Ascend from September 1990 to June 1995, most recently as Executive Vice President and Vice President, Operations. Mr. Ejabat holds a B.S. in Industrial

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Engineering and an M.S. in Systems Engineering from California State University at Northridge and an M.B.A. from Pepperdine University.

Kirk Misaka has served as Zhone’s Corporate Treasurer since November 2000 and as Chief Financial Officer and Secretary since July 2003. Prior to joining Zhone, Mr. Misaka was a Certified Public Accountant with KPMG LLP from 1980 to 2000, becoming a partner in 1989. Mr. Misaka earned a B.S. and an M.S. in Accounting from the University of Utah, and an M.S. in Tax from Golden Gate University.

ITEM 1A.    RISK FACTORS

Set forth below and elsewhere in this report and in other documents we file with the SEC are risks and uncertainties that could cause actual results to differ materially from the results contemplated by the forward-looking statements contained in this report.

Our future operating results are difficult to predict and our stock price may continue to be volatile.

As a result of a variety of factors discussed in this report, our revenues for a particular quarter are difficult to predict. Our revenue and operating results may vary significantly from quarter to quarter due to a number of factors, many of which are outside of our control. The primary factors that may affect our results of operations include the following:

Any of the foregoing factors, or any other factors discussed elsewhere herein, could have a material adverse effect on our business, results of operations, and financial condition that could adversely affect our stock price. In addition, public stock markets have experienced, and may in the future experience, extreme price and trading

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volume volatility, particularly in the technology sectors of the market. This volatility has significantly affected the market prices of securities of many technology companies for reasons frequently unrelated to or disproportionately impacted by the operating performance of these companies. These broad market fluctuations may adversely affect the market price of our common stock. In addition, if our average market capitalization falls below the carrying value of our assets for an extended period of time, this may indicate that the fair value of our net assets is below their carrying value, and may result in recording impairment charges related to our goodwill and other intangible assets. At December 31, 2007, we had goodwill with a carrying value of $70.4 million.

We have incurred significant losses to date and expect that we will continue to incur losses in the foreseeable future. If we fail to generate sufficient revenue to achieve or sustain profitability, our stock price could decline.

We have incurred significant losses to date and expect that we will continue to incur losses in the foreseeable future. Our net losses for 2007 and 2006 were $12.1 million and $142.7 million, respectively, and we had an accumulated deficit of $913.1 million at December 31, 2007. We have significant fixed expenses and expect that we will continue to incur substantial manufacturing, research and product development, sales and marketing, customer support, administrative and other expenses in connection with the ongoing development of our business. In addition, we may be required to spend more on research and product development than originally budgeted to respond to industry trends. We may also incur significant new costs related to acquisitions and the integration of new technologies and other acquisitions that may occur in the future. We may not be able to adequately control costs and expenses or achieve or maintain adequate operating margins. As a result, our ability to achieve and sustain profitability will depend on our ability to generate and sustain substantially higher revenue while maintaining reasonable cost and expense levels. If we fail to generate sufficient revenue to achieve or sustain profitability, we will continue to incur substantial operating losses and our stock price could decline.

We have significant debt obligations, which could adversely affect our business, operating results and financial condition.

As of December 31, 2007, we had approximately $34.4 million of total debt, of which $15.3 million was current and $19.1 million was long-term. Our debt obligations could materially and adversely affect us in a number of ways, including:

We cannot assure you that we will be able to generate sufficient cash flow in amounts sufficient to enable us to service our debt or to meet our working capital and capital expenditure requirements. If we are unable to generate sufficient cash flow from operations or to borrow sufficient funds to service our debt, due to borrowing base restrictions or otherwise, we may be required to sell assets, reduce capital expenditures or obtain additional financing. We cannot assure you that we will be able to engage in any of these actions on reasonable terms, if at all.

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If we are unable to obtain additional capital to fund our existing and future operations, we may be required to reduce the scope of our planned product development, and marketing and sales efforts, which would harm our business, financial condition and results of operations.

The development and marketing of new products, and the expansion of our direct sales operations and associated support personnel requires a significant commitment of resources. We may continue to incur significant operating losses or expend significant amounts of capital if:

As a result, we may need to raise substantial additional capital. Additional capital, if required, may not be available on acceptable terms, or at all. For example, U.S. credit markets have recently experienced significant dislocations and liquidity disruptions which have caused the spreads on prospective debt financings to widen considerably. These circumstances have materially impacted liquidity in debt markets, making financing terms for borrowers less attractive, and in certain cases have resulted in the unavailability of certain types of debt financing. Continued uncertainty in credit markets may negatively impact our ability to access debt financing on favorable terms, or at all. If additional capital is raised through the issuance of debt securities or other debt financing, the terms of such debt may include covenants, restrictions and financial ratios that may restrict our ability to operate our business. The recent events in the U.S. credit markets have also had an adverse effect on other U.S. financial markets, which may make it more difficult or costly for us to raise capital through the issuance of common stock, preferred stock or other equity securities. If we are unable to obtain additional capital or are required to obtain additional capital on terms that are not favorable to us, we may be required to reduce the scope of our planned product development and sales and marketing efforts, which would harm our business, financial condition and results of operations.

If demand for our SLMS products does not develop, then our results of operations and financial condition will be adversely affected.

Our future revenue depends significantly on our ability to successfully develop, enhance and market our SLMS products to the network service provider market. Most network service providers have made substantial investments in their current infrastructure, and they may elect to remain with their current architectures or to adopt new architectures, such as SLMS, in limited stages or over extended periods of time. A decision by a customer to purchase our SLMS products will involve a significant capital investment. We must convince our service provider customers that they will achieve substantial benefits by deploying our products for future upgrades or expansions. We do not know whether a viable market for our SLMS products will develop or be sustainable. If this market does not develop or develops more slowly than we expect, our business, financial condition and results of operations will be seriously harmed.

We depend upon the development of new products and enhancements to existing products, and if we fail to predict and respond to emerging technological trends and customers’ changing needs, our operating results and market share may suffer.

The markets for our products are characterized by rapidly changing technology, evolving industry standards, changes in end-user requirements, frequent new product introductions and changes in communications offerings from network service provider customers. Our future success depends on our ability to anticipate or adapt to such changes and to offer, on a timely and cost-effective basis, products that meet changing customer demands and industry standards. We may not have sufficient resources to successfully and accurately anticipate customers’ changing needs and technological trends, manage long development cycles or develop, introduce and market new products and enhancements. The process of developing new technology is complex and uncertain, and if we fail

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to develop new products or enhancements to existing products on a timely and cost-effective basis, or if our new products or enhancements fail to achieve market acceptance, our business, financial condition and results of operations would be materially adversely affected.

Because our products are complex and are deployed in complex environments, our products may have defects that we discover only after full deployment by our customers, which could seriously harm our business.

We produce highly complex products that incorporate leading-edge technology, including both hardware and software. Software typically contains defects or programming flaws that can unexpectedly interfere with expected operations. In addition, our products are complex and are designed to be deployed in large quantities across complex networks. Because of the nature of these products, they can only be fully tested when completely deployed in large networks with high amounts of traffic, and there is no assurance that our pre-shipment testing programs will be adequate to detect all defects. As a result, our customers may discover errors or defects in our hardware or software, or our products may not operate as expected, after they have been fully deployed by our customers. If we are unable to cure a product defect, we could experience damage to our reputation, reduced customer satisfaction, loss of existing customers and failure to attract new customers, failure to achieve market acceptance, reduced sales opportunities, loss of revenue and market share, increased service and warranty costs, diversion of development resources, legal actions by our customers, and increased insurance costs. Defects, integration issues or other performance problems in our products could also result in financial or other damages to our customers. Our customers could seek damages for related losses from us, which could seriously harm our business, financial condition and results of operations. A product liability claim brought against us, even if unsuccessful, would likely be time consuming and costly. The occurrence of any of these problems would seriously harm our business, financial condition and results of operations.

A shortage of adequate component supply or manufacturing capacity could increase our costs or cause a delay in our ability to fulfill orders, and our failure to estimate customer demand properly may result in excess or obsolete component inventories that could adversely affect our gross margins.

Occasionally, we may experience a supply shortage, or a delay in receiving, certain component parts as a result of strong demand for the component parts and/or capacity constraints or other problems experienced by suppliers. If shortages or delays persist, the price of these components may increase, or the components may not be available at all, and we may also encounter shortages if we do not accurately anticipate our needs. Conversely, we may not be able to secure enough components at reasonable prices or of acceptable quality to build new products in a timely manner in the quantities or configurations needed. Accordingly, our revenue and gross margins could suffer until other sources can be developed. Our operating results would also be adversely affected if, anticipating greater demand than actually develops, we commit to the purchase of more components than we need. Furthermore, as a result of binding price or purchase commitments with suppliers, we may be obligated to purchase components at prices that are higher than those available in the current market. In the event that we become committed to purchase components at prices in excess of the current market price when the components are actually used, our gross margins could decrease.

We rely on contract manufacturers for a portion of our manufacturing requirements.

We rely on contract manufacturers to perform a portion of the manufacturing operations for our products. These contract manufacturers build product for other companies, including our competitors. In addition, we do not have contracts in place with some of these providers and may not be able to effectively manage those relationships. We cannot be certain that our contract manufacturers will be able to fill our orders in a timely manner. We face a number of risks associated with this dependence on contract manufacturers including reduced control over delivery schedules, the potential lack of adequate capacity during periods of excess demand, poor manufacturing yields and high costs, quality assurance, increases in prices, and the potential misappropriation of our intellectual property. We have experienced in the past, and may experience in the future, problems with our contract manufacturers, such as inferior quality, insufficient quantities and late delivery of products.

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We depend on sole or limited source suppliers for several key components. If we are unable to obtain these components on a timely basis, we will be unable to meet our customers’ product delivery requirements, which would harm our business.

We currently purchase several key components from single or a limited number of suppliers. If any of our sole or limited source suppliers experience capacity constraints, work stoppages or any other reduction or disruption in output, they may be unable to meet our delivery schedules. Our suppliers may enter into exclusive arrangements with our competitors, be acquired by our competitors, stop selling their products or components to us at commercially reasonable prices, refuse to sell their products or components to us at any price or be unable to obtain or have difficulty obtaining components for their products from their suppliers. If we do not receive critical components from our sole or limited source suppliers in a timely manner, we will be unable to meet our customers’ product delivery requirements. Any failure to meet a customer’s delivery requirements could materially adversely affect our business, operating results and financial condition and could materially damage customer relationships.

Our target customer base is concentrated, and the loss of one or more of our customers could harm our business.

The target customers for our products are network service providers that operate voice, data and video communications networks. There are a limited number of potential customers in our target market. While no customer accounted for more than 10% of our revenue in 2007 or 2006, we expect that a significant portion of our future revenue will depend on sales of our products to a limited number of customers. Any failure of one or more customers to purchase products from us for any reason, including any downturn in their businesses, would seriously harm our business, financial condition and results of operations.

Industry consolidation may lead to increased competition and may harm our operating results.

There has been a trend toward industry consolidation in the communications equipment market for several years. We expect this trend to continue as companies attempt to strengthen or hold their market positions in an evolving industry and as companies are acquired or are unable to continue operations. We believe that industry consolidation may result in stronger competitors that are better able to compete as sole-source vendors for customers. This could have a material adverse effect on our business, financial condition and results of operations. Furthermore, rapid consolidation could result in a decrease in the number of customers we serve. Loss of a major customer could have a material adverse effect on our business, financial condition and results of operations.

We are exposed to the credit risk of some of our customers and to credit exposures in weakened markets, which could result in material losses.

Industry and economic conditions have weakened the financial position of some of our customers and their ability to access capital to finance their business operations, including capital expenditures. To sell to some of these customers, we may be required to assume incremental risks of uncollectible accounts or to extend credit or credit support. While we monitor these situations carefully and attempt to take appropriate measures to protect ourselves, including factoring credit arrangements to financial institutions, it is possible that we may have to defer revenue until cash is collected or write down or write off uncollectible accounts. Such write-downs or write-offs, if large, could have a material adverse effect on our operating results and financial condition.

The market we serve is highly competitive and we may not be able to compete successfully.

Competition in the communications equipment market is intense. This market is characterized by rapid change, converging technologies and a migration to networking solutions that offer superior advantages. We are aware of many companies in related markets that address particular aspects of the features and functions that our products provide. Currently, our primary competitors include Alcatel-Lucent, Calix, Huawei, and Occam

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Networks, among others. We also may face competition from other large communications equipment companies or other companies that may enter our market in the future. In addition, a number of companies have introduced products that address the same network needs that our products address, both domestically and abroad. Many of our competitors have longer operating histories, greater name recognition, larger customer bases and greater financial, technical, sales and marketing resources than we do and may be able to undertake more extensive marketing efforts, adopt more aggressive pricing policies and provide more customer financing than we can. In particular, we are encountering price-focused competitors from Asia, especially China, which places pressure on us to reduce our prices. If our competitors offer deep discounts on certain products, we may need to lower prices or offer other favorable terms in order to compete successfully. Moreover, our competitors may foresee the course of market developments more accurately than we do and could develop new technologies that render our products less valuable or obsolete.

In our markets, principal competitive factors include:

If we are unable to compete successfully against our current and future competitors, we may have difficulty obtaining or retaining customers, and we could experience price reductions, order cancellations, increased expenses and reduced gross margins, any of which could have a material adverse effect on our business, financial condition and results of operations.

Our success largely depends on our ability to retain and recruit key personnel, and any failure to do so would harm our ability to meet key objectives.

Our future success depends upon the continued services of our executive officers and our ability to identify, attract and retain highly skilled technical, managerial, sales and marketing personnel who have critical industry experience and relationships that we rely on to build our business, including Morteza Ejabat, our co-founder, Chairman, President and Chief Executive Officer, and Kirk Misaka, our Chief Financial Officer. The loss of the services of any of our key employees, including Messrs. Ejabat and Misaka, could delay the development and production of our products and negatively impact our ability to maintain customer relationships, which would harm our business, financial condition and results of operations.

Any strategic acquisitions or investments we make could disrupt our operations and harm our operating results.

As of December 31, 2007, we had acquired twelve companies or product lines since we were founded in 1999. Further, we may acquire additional businesses, products or technologies in the future. On an ongoing basis,

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we may evaluate acquisitions of, or investments in, complementary companies, products or technologies to supplement our internal growth. Also, in the future, we may encounter difficulties identifying and acquiring suitable acquisition candidates on reasonable terms.

If we do complete future acquisitions, we could:

Any acquisitions or investments that we make in the future will involve numerous risks, including:

Mergers and acquisitions of high-technology companies are inherently risky and subject to many factors outside of our control, and we cannot be certain that our previous or future acquisitions will be successful and will not materially adversely affect our business, operating results or financial condition. We do not know whether we will be able to successfully integrate the businesses, products, technologies or personnel that we might acquire in the future or that any strategic investments we make will meet our financial or other investment objectives. Any failure to do so could seriously harm our business, financial condition and results of operations.

We have been, and may continue to be, adversely affected by unfavorable economic and market conditions, and geopolitical uncertainties.

Economic conditions worldwide have contributed to slowdowns in the communications industry and may impact our business. Our customers and potential customers continue to experience a severe economic slowdown that has led to significant decreases in their revenues. In addition, recent disruptions in U.S. financial markets have limited the ability of some of our customers and potential customers to access the capital needed to finance their business operations, including capital expenditures on new equipment and equipment upgrades. For most of the last decade, the markets for our equipment have been influenced by the entry into the communications

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services business of a substantial number of new companies. In the United States, this was due largely to changes in the regulatory environment, in particular those brought about by the Telecommunications Act of 1996. These new companies raised significant amounts of capital, much of which they invested in new equipment, causing acceleration in the growth of the markets for communications equipment. More recently, there has been a reversal of this trend, including the failure of a large number of the new entrants and a sharp contraction of the availability of capital to the industry. This industry trend has been compounded by the weakness in the United States economy as well as the economies in virtually all of the countries in which we market our products. In addition, the continuing turmoil in the geopolitical environment in many parts of the world, including terrorist activities and military actions, particularly the continuing tension in and surrounding Iraq, may continue to adversely affect global economic conditions. If the economic, market and geopolitical conditions in the United States and the rest of the world do not improve, or if they deteriorate, we may experience material adverse impacts on our business, operating results and financial condition.

Sales to communications service providers are especially volatile, and weakness in sales orders from this industry may harm our operating results and financial condition.

Sales activity in the service provider industry depends upon the stage of completion of expanding network infrastructures, the availability of funding, and the extent to which service providers are affected by regulatory, economic and business conditions in the country of operations. Although some service providers may be increasing capital expenditures over the depressed levels that have prevailed over the last few years, weakness in orders from this industry could have a material adverse effect on our business, operating results and financial condition. Slowdowns in the general economy, overcapacity, changes in the service provider market, regulatory developments and constraints on capital availability have had a material adverse effect on many of our service provider customers, with many of these customers going out of business or substantially reducing their expansion plans. These conditions have materially harmed our business and operating results, and we expect that some or all of these conditions may continue for the foreseeable future. Finally, service provider customers typically have longer implementation cycles; require a broader range of service including design services; demand that vendors take on a larger share of risks; often require acceptance provisions, which can lead to a delay in revenue recognition; and expect financing from vendors. All these factors can add further risk to business conducted with service providers.

Decreased effectiveness of share-based compensation could adversely affect our ability to attract and retain employees.

We have historically used stock options as a key component of our employee compensation program in order to align the interests of our employees with the interests of our stockholders, encourage employee retention and provide competitive compensation and benefit packages. In the first quarter of 2006, we adopted SFAS 123R, which required the measurement and recognition of compensation expense for all share-based payment awards made to employees and directors based on estimated fair values. As a result, starting with fiscal 2006, our operating results contain a charge for share-based compensation expense related to employee stock options and employee stock purchases. This charge is in addition to share-based compensation expense we have recognized in prior periods related to stock options under APB Opinion No. 25. As a result of the adoption of SFAS 123R, beginning with fiscal 2006, our earnings were lower than they would have been had we not been required to adopt SFAS 123R. This will continue to be the case for future periods. We cannot predict the effect that this adverse impact on our reported operating results will have on the trading price of our common stock. If the trading price of our common stock declines, this would reduce the value of our share-based compensation to our present employees and could affect our ability to retain them. In addition, in recent periods, some of our employee stock options have had exercise prices in excess of our stock price, which reduces their value to employees and could affect our ability to retain present, or attract prospective employees. Moreover, difficulties relating to obtaining stockholder approval of equity compensation plans could make it harder or more expensive for us to grant share-based payments to employees in the future.

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Due to the international nature of our business, political or economic changes or other factors in a specific country or region could harm our future revenue, costs and expenses and financial condition.

We currently have international operations consisting of sales and technical support teams in various locations around the world. We expect to continue expanding our international operations in the future. The successful management and expansion of our international operations requires significant human effort and the commitment of substantial financial resources. Further, our international operations may be subject to certain risks and challenges that could harm our operating results, including:

Any of these factors could harm our existing international operations and business or impair our ability to continue expanding into international markets.

Compliance or the failure to comply with current and future environmental regulations could cause us significant expense.

We are subject to a variety of federal, state, local and foreign environmental regulations. If we fail to comply with any present and future regulations, we could be subject to future liabilities, the suspension of production or a prohibition on the sale of our products. In addition, such regulations could require us to incur other significant expenses to comply with environmental regulations, including expenses associated with the redesign of any non-compliant product. From time to time new regulations are enacted, and it is difficult to anticipate how such regulations will be implemented and enforced. For example, in 2003 the European Union enacted the Restriction on the Use of Certain Hazardous Substances in Electrical and Electronic Equipment Directive (RoHS) and the Waste Electrical and Electronic Equipment Directive (WEEE), for implementation in European Union member states. We are aware of similar legislation that is currently in force or is being considered in the United States, as well as other countries, such as Japan and China. Our failure to comply with any of such regulatory requirements or contractual obligations could result in our being liable for costs, fines, penalties and third-party claims, and could jeopardize our ability to conduct business in countries in the jurisdictions where these regulations apply.

Adverse resolution of litigation may harm our operating results or financial condition.

We are a party to various lawsuits and claims in the normal course of our business. Litigation can be expensive, lengthy, and disruptive to normal business operations. Moreover, the results of complex legal proceedings are difficult to predict. An unfavorable resolution of a particular lawsuit could have a material adverse effect on our business, operating results and financial condition. For additional information regarding litigation in which we are involved, see Item 3, “Legal Proceedings,” contained in Part I of this report.

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Our intellectual property rights may prove difficult to protect and enforce.

We generally rely on a combination of copyrights, patents, trademarks and trade secret laws and restrictions on disclosure to protect our intellectual property rights. We also enter into confidentiality or license agreements with our employees, consultants and corporate partners, and control access to and distribution of our proprietary information. Despite our efforts to protect our proprietary rights, unauthorized parties may attempt to copy or otherwise obtain and use our products or technology. Monitoring unauthorized use of our technology is difficult, and we do not know whether the steps we have taken will prevent unauthorized use of our technology, particularly in foreign countries where the laws may not protect our proprietary rights as extensively as in the United States. We cannot assure you that our pending, or any future, patent applications will be granted, that any existing or future patents will not be challenged, invalidated, or circumvented, or that any existing or future patents will be enforceable. While we are not dependent on any individual patents, if we are unable to protect our proprietary rights, we may find ourselves at a competitive disadvantage to others who need not incur the substantial expense, time and effort required to create the innovative products.

We may be subject to intellectual property infringement claims that are costly and time consuming to defend and could limit our ability to use some technologies in the future.

Third parties have in the past and may in the future assert claims or initiate litigation related to patent, copyright, trademark and other intellectual property rights to technologies and related standards that are relevant to us. The asserted claims or initiated litigation can include claims against us or our manufacturers, suppliers or customers alleging infringement of their proprietary rights with respect to our existing or future products, or components of those products. We have received correspondence from companies claiming that many of our products are using technology covered by or related to the intellectual property rights of these companies and inviting us to discuss licensing arrangements for the use of the technology. Regardless of the merit of these claims, intellectual property litigation can be time consuming and costly, and result in the diversion of technical and management personnel. Any such litigation could force us to stop selling, incorporating or using our products that include the challenged intellectual property, or redesign those products that use the technology. In addition, if a party accuses us of infringing upon its proprietary rights, we may have to enter into royalty or licensing agreements, which may not be available on terms acceptable to us, if at all. If we are unsuccessful in any such litigation, we could be subject to significant liability for damages and loss of our proprietary rights. Any of these results could have a material adverse effect on our business, financial condition and results of operations.

We rely on the availability of third party licenses.

Many of our products are designed to include software or other intellectual property licensed from third parties. It may be necessary in the future to seek or renew licenses relating to various elements of the technology used to develop these products. We cannot assure you that our existing and future third-party licenses will be available to us on commercially reasonable terms, if at all. Our inability to maintain or obtain any third-party license required to sell or develop our products and product enhancements could require us to obtain substitute technology of lower quality or performance standards, or at greater cost.

The long and variable sales cycles for our products may cause revenue and operating results to vary significantly from quarter to quarter.

The target customers for our products have substantial and complex networks that they traditionally expand in large increments on a periodic basis. Accordingly, our marketing efforts are focused primarily on prospective customers that may purchase our products as part of a large-scale network deployment. Our target customers typically require a lengthy evaluation, testing and product qualification process. Throughout this process, we are often required to spend considerable time and incur significant expense educating and providing information to prospective customers about the uses and features of our products. Even after a company makes the final decision to purchase our products, it may deploy our products over extended periods of time. The timing of deployment of our products varies widely, and depends on a number of factors, including our customers’ skill sets, geographic

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density of potential subscribers, the degree of configuration and integration required to deploy our products, and our customers’ ability to finance their purchase of our products as well as their operations. As a result of any of these factors, our revenue and operating results may vary significantly from quarter to quarter.

The communications industry is subject to government regulations, which could harm our business.

The FCC has jurisdiction over the entire communications industry in the United States and, as a result, our existing and future products and our customers’ products are subject to FCC rules and regulations. Changes to current FCC rules and regulations and future FCC rules and regulations could negatively affect our business. The uncertainty associated with future FCC decisions may cause network service providers to delay decisions regarding their capital expenditures for equipment for broadband services. In addition, international regulatory bodies establish standards that may govern our products in foreign markets. Changes to or future domestic and international regulatory requirements could result in postponements or cancellations of customer orders for our products and services, which would harm our business, financial condition and results of operations. Further, we cannot be certain that we will be successful in obtaining or maintaining regulatory approvals that may, in the future, be required to operate our business.

The ability of unaffiliated stockholders to influence key transactions, including changes of control, may be limited by significant insider ownership, provisions of our charter documents and provisions of Delaware law.

At December 31, 2007, our executive officers, directors and entities affiliated with them beneficially owned, in the aggregate, approximately 29% of our outstanding common stock. These stockholders, if acting together, will be able to influence substantially all matters requiring approval by our stockholders, including the election of directors and the approval of mergers or other business combination transactions. Circumstances may arise in which the interests of these stockholders could conflict with the interests of our other stockholders. These stockholders could delay or prevent a change in control of our company even if such a transaction would be beneficial to our other stockholders. In addition, provisions of our certificate of incorporation, bylaws and Delaware law could make it more difficult for a third party to acquire us, even if doing so would be beneficial to certain stockholders.

Our business and operations are especially subject to the risks of earthquakes and other natural catastrophic events.

Our corporate headquarters, including a significant portion of our research and development operations, are located in Northern California, a region known for seismic activity. Additionally, some of our facilities, including our manufacturing facilities, are located near geographic areas that have experienced hurricanes in the past. A significant natural disaster, such as an earthquake, hurricane, fire, flood or other catastrophic event, could severely affect our ability to conduct normal business operations, and as a result, our future operating results could be materially and adversely affected.

ITEM 1B.    UNRESOLVED STAFF COMMENTS

None.

ITEM 2.    PROPERTIES

Our worldwide headquarters are located at our Oakland, California campus. In March 2001, we purchased the land and buildings in Oakland, California which we had previously leased under a synthetic lease agreement. As part of the financing for the purchase, we granted a deed of trust on the property to the lender and were required to transfer the land and buildings to a new wholly-owned consolidated subsidiary, Zhone Technologies Campus, LLC, from which we currently lease the land and buildings. We are the sole member and manager of Zhone Technologies Campus, LLC. Our lease for this facility will expire in March 2011. The Oakland campus

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consists of three buildings with an aggregate of approximately 180,000 square feet, and is used for our executive offices, research and product development activities, and manufacturing and warehousing.

In addition to our Oakland campus, we also lease facilities for manufacturing, research and development purposes at locations including Largo, Florida, Alpharetta, Georgia, Portsmouth, New Hampshire and Westlake Village, California. We also maintain smaller offices to provide sales and customer support at various domestic and international locations. We believe that our existing facilities are suitable and adequate for our present purposes.

ITEM 3.    LEGAL PROCEEDINGS

Paradyne Matters

As a result of our acquisition of Paradyne, we became involved in various legal proceedings, claims and litigation, including those identified below, relating to the operations of Paradyne prior to our acquisition of Paradyne.

A purported stockholder class action complaint was filed in December 2001 in the United States District Court in the Southern District of New York against Paradyne, Paradyne’s then-current directors and executive officers, and each of the underwriters (the “Underwriter Defendants”) who participated in Paradyne’s initial public offering and follow-on offering (collectively, the “Paradyne Offerings”). The complaint alleges that, in connection with the Paradyne Offerings, the Underwriter Defendants charged excessive commissions, inflated transaction fees not disclosed in the applicable registration statements and allocated shares of the Paradyne Offerings to favored customers in exchange for purported promises by such customers to purchase additional shares in the aftermarket, thereby allegedly inflating the market price for the Paradyne Offerings. The complaint seeks damages in an unspecified amount for the purported class for the losses suffered during the class period. This action has been consolidated with hundreds of other securities class actions commenced against more than 300 companies (collectively, the “Issuer Defendants”) and approximately 40 investment banks in which the plaintiffs make substantially similar allegations as those made against Paradyne with respect to the initial public offerings and/or follow-on offerings at issue in those other cases. All of these actions have been consolidated before Judge Shira Scheindlin under the caption In re: Initial Public Offering Securities Litigation (the “IPO Actions”).

In 2003, the Issuer Defendants participated in a global settlement among the plaintiffs and the insurance companies that provided directors’ and officers’ insurance coverage to the Issuer Defendants (the “Issuer Settlement”). The Issuer Settlement agreements provided for the Issuer Defendants (including Paradyne) to be fully released and dismissed from the IPO Actions. Under the terms of the Issuer Settlement agreements, Paradyne would not have been required to make any cash payment to the plaintiffs. Although the District Court preliminarily approved the Issuer Settlement, the preliminary approval remained subject to a future final settlement order, after notice of settlement had been provided to class members and they had been afforded the opportunity to oppose or opt out of the settlement. However, before the District Court could conduct its final settlement hearing, on December 5, 2006, the United States Court of Appeals for the Second Circuit (the “Second Circuit”) reversed an October 13, 2004 order of the District Court in which Judge Scheindlin had granted class certification for six “test cases” in the IPO Actions. On April 4, 2007, the Second Circuit denied the plaintiffs’ petition for rehearing of the December 5, 2006 ruling. The District Court has since made clear that the Issuer Settlement cannot be approved — in its current form — as a class action settlement in light of the Second Circuit’s December 5, 2006 ruling and has declined to schedule a final approval hearing with respect to the Issuer Settlement for that reason. Counsel for the plaintiffs, for the Issuer Defendants and for the insurance companies that provided directors’ and officers’ insurance to the Issuer Defendants are currently engaged in discussions to restructure and salvage the Issuer Settlement. There can be no assurance that a restructured Issuer Settlement will be reached by the parties or that any such future settlement will meet the conditions for final approval by the District Court.

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Other Matters

We are subject to other legal proceedings, claims and litigation arising in the ordinary course of business. While the outcome of these matters is currently not determinable, we do not expect that the ultimate costs to resolve these matters will have a material adverse effect on our consolidated financial position or results of operations. However, litigation is subject to inherent uncertainties, and unfavorable rulings could occur. If an unfavorable ruling were to occur, there exists the possibility of a material adverse impact on the results of operations of the period in which the ruling occurs, or future periods.

ITEM 4.    SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

None.

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PART II

ITEM 5.    MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Price Range of Common Stock

Our common stock is listed on the Nasdaq Global Market under the symbol “ZHNE”. The following table sets forth, for the periods indicated, the high and low per share sales prices of our common stock as reported on Nasdaq.

As of December 31, 2007, there were 1,872 registered stockholders of record. A substantially greater number of holders of Zhone common stock are “street name” or beneficial holders, whose shares are held of record by banks, brokers and other financial institutions.

Dividend Policy

We have never paid or declared any cash dividends on our common stock or other securities and do not anticipate paying cash dividends in the foreseeable future. Any future determination to pay cash dividends will be at the discretion of the Board of Directors, subject to any applicable restrictions under our debt and credit agreements, and will be dependent upon our financial condition, results of operations, capital requirements, general business condition and such other factors as the Board of Directors may deem relevant.

Recent Sales of Unregistered Securities

There were no unregistered sales of equity securities during 2007.

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ITEM 6.    SELECTED FINANCIAL DATA

The following selected financial data has been derived from our consolidated financial statements and should be read in conjunction with the consolidated financial statements and notes thereto, and with “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” To date, we have generated a significant amount of revenue from sales of products obtained through acquisitions, as well as incurred significant acquisition related charges such as in-process research and development charges as discussed in Note 2 to the consolidated financial statements and in Management’s Discussion and Analysis of Financial Condition and Results of Operations. During the years ended December 31, 2007, 2006, 2005, 2004 and 2003, we recorded charges of zero, $113.7 million, $102.1 million, $0.2 million, and zero, respectively, related to the impairment of acquisition related intangibles and goodwill as discussed in Note 3 to the consolidated financial statements. In addition, all per share and weighted average share data for 2003 has been restated retroactively to reflect the effect of the Tellium merger in November 2003. The historical results are not necessarily indicative of results to be expected for any future period.

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ITEM 7.    MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Overview

We believe that we are the first company dedicated solely to developing the full spectrum of next-generation access network solutions to cost-effectively deliver high bandwidth services while simultaneously preserving the investment in today’s networks. Our next-generation solutions are based upon our Single Line Multi Service, or SLMS, architecture. From its inception, this SLMS architecture was specifically designed for the delivery of multiple classes of subscriber services (such as voice, data and video distribution), rather than being based on a particular protocol or media. In other words, our SLMS products are built to support the migration from legacy circuit to packet technologies and from copper to fiber technologies. This flexibility and versatility allows our products to adapt to future technologies while allowing service providers to focus on the delivery of additional high bandwidth services. Because this SLMS architecture is designed to interoperate with existing legacy equipment, service providers can leverage their existing networks to deliver a combination of voice, data and video services today, while they migrate, either simultaneously or at a future date, from legacy equipment to next-generation equipment with minimal interruption. We believe that our SLMS solution provides an evolutionary path for service providers from their existing infrastructures, as well as gives newer service providers the capability to deploy cost-effective, multi-service networks that can support voice, data and video.

Our product offerings fall within two categories: (1) the SLMS product family and (2) legacy, services, and other. Commencing with the first quarter of 2007, we have reported our optical transport business with our legacy, services and other product category. We have reclassified prior period balances in order to conform to the current period’s presentation. We sold our legacy iMarc product line in December 2006, our legacy Access Node product line in December 2007 and our legacy GigaMux product line in January 2008.

Our global customer base includes regional, national and international telecommunications carriers, as well as cable service providers. To date, our products are deployed by over 600 network service providers on six continents worldwide. We believe that we have assembled the employee base, technological breadth and market presence to provide a simple yet comprehensive set of next-generation solutions to the bandwidth bottleneck in the access network and the other problems encountered by network service providers when delivering communications services to subscribers.

Since inception, we have incurred significant operating losses and had an accumulated deficit of $913.1 million as of December 31, 2007.

Going forward, our key financial objectives include the following:

Acquisitions

Since inception, we have utilized a strategy of acquisitions to acquire customers, technology and build scale within the network access markets. As of December 31, 2007, we had completed twelve acquisitions of complementary companies, products or technologies to supplement our internal growth. To date, we have generated a significant amount of our revenue from sales of products obtained through acquisitions. Some of the more significant acquisitions have included Paradyne in September 2005, Sorrento Networks Corporation in July 2004, and Tellium Inc. in November 2003.

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If we complete additional acquisitions in the future, we could consume cash, incur substantial additional debt and other liabilities, incur amortization expenses related to acquired intangible assets or incur large write-offs related to impairment of goodwill and long-lived assets. In addition, future acquisitions may have a significant impact on our short term results of operations, materially impacting revenues or expenses and making period to period comparisons of our results of operations less meaningful.

Critical Accounting Policies and Estimates

Management’s discussion and analysis of financial condition and results of operations is based upon our consolidated financial statements, which have been prepared in accordance with generally accepted accounting principles in the United States of America. The preparation of these consolidated financial statements requires management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenue and expenses, and related disclosure of contingent assets and liabilities. The policies discussed below are considered by management to be critical because changes in such estimates can materially affect the amount of our reported net income or loss. For all of these policies, management cautions that actual results may differ materially from these estimates under different assumptions or conditions.

Revenue Recognition

We recognize revenue when the earnings process is complete. We recognize product revenue upon shipment of product under contractual terms which transfer title to customers upon shipment, under normal credit terms, net of estimated sales returns and allowances at the time of shipment. Revenue is deferred if there are significant post-delivery obligations, if collection is not considered reasonably assured at the time of sale, or if the fees are not fixed or determinable. When significant post-delivery obligations exist, revenue is deferred until such obligations are fulfilled. Our arrangements generally do not have any significant post-delivery obligations. We offer products and services such as support, education and training, hardware upgrades and post-warranty support. For multiple element revenue arrangements, we establish the fair value of these products and services based primarily on sales prices when the products and services are sold separately. If fair value cannot be established for undelivered elements, all of the revenue under the arrangement is deferred until those elements have been delivered. When collectibility is not reasonably assured, revenue is recognized when cash is collected. Revenue from education services and support services is recognized over the contract term or as the service is performed. We make certain sales to product distributors. These customers are given certain privileges to return a portion of inventory. Return privileges generally allow distributors to return inventory based on a percent of purchases made within a specific period of time. We recognize revenue on sales to distributors that have contractual return rights when the products have been sold by the distributors, unless there is sufficient customer specific sales and sales returns history to support revenue recognition upon shipment. In those instances when shipments made to distributors are recognized upon shipment of the products from the factory, we use historical rates of return from the distributors to provide for estimated product returns in accordance with Statement of Financial Accounting Standards (“SFAS”) No. 48, Revenue Recognition When Right of Return Exists. We accrue for warranty costs, sales returns and other allowances at the time of shipment based on historical experience and expected future costs.

Allowances for Sales Returns and Doubtful Accounts

We record an allowance for sales returns for estimated future product returns related to current period product revenue. The allowance for sales returns is recorded as a reduction of revenue and an allowance against our accounts receivable. We base our allowance for sales returns on periodic assessments of historical trends in product return rates and current approved returned products. If the actual future returns were to deviate from the historical data on which the reserve had been established, our future revenue could be adversely affected. We record an allowance for doubtful accounts for estimated losses resulting from the inability of customers to make payments for amounts owed to us. The allowance for doubtful accounts is recorded as a charge to general and administrative expenses. We base our allowance on periodic assessments of our customers’ liquidity and

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financial condition through analysis of information obtained from credit rating agencies, financial statement reviews and historical collection trends. Additional allowances may be required in the future if the liquidity or financial condition of our customers deteriorates, resulting in impairment in their ability to make payments.

Valuation of Long-Lived Assets, Including Goodwill and Other Acquisition-Related Intangible Assets

Our long-lived assets have consisted primarily of goodwill, other acquisition-related intangible assets and property and equipment. We review goodwill for impairment in November of each year, or more frequently if events or circumstances indicate the carrying value of an asset may not be recoverable in accordance with SFAS No. 142, Goodwill and Other Intangible Assets (SFAS 142). Such events or circumstances include, but are not limited to, a significant decrease in the benefits realized from an acquired business, difficulty and delays in integrating an acquired business, a significant change in the operations of an acquired business, or significant negative economic trends, such as stock price movements. The provisions of SFAS 142 require that a two-step impairment test be performed on goodwill. In the first step, we compare the fair value of each reporting unit to its carrying value. We have determined that we operate in a single segment with one operating unit. We estimate the fair value of our reporting unit based on a combination of the market, income and replacement cost approaches. In the application of the impairment testing, we are required to make estimates of future operating trends and resulting cash flows and judgments on discount rates and other variables. Actual future results and other assumed variables could differ from these estimates. If the fair value of the reporting unit exceeds the carrying value, goodwill is not impaired and we are not required to perform further testing. If the carrying value exceeds the fair value of the reporting unit, then we must perform the second step of the impairment test in order to determine the implied fair value of the reporting unit. An impairment loss is recognized to the extent that the carrying amount exceeds the implied fair value of the reporting unit.

During 2006 and 2005, we determined that indicators of impairment existed, resulting in an impairment charge to goodwill of $110.5 million and $55.2 million, respectively. Due to uncertain market conditions and potential changes in our strategy and product portfolio, it is possible that forecasts used to support our goodwill may change in the future, which could result in additional non-cash impairment charges that would adversely affect our results of operations and financial condition. As of December 31, 2007, we had $70.4 million of goodwill.

In accordance with SFAS No. 144, Accounting for the Impairment or Disposal of Long-Lived Assets, we review long-lived assets, including intangible assets subject to amortization and property and equipment, for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be fully recoverable based on expected undiscounted cash flows attributable to that asset. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to future net undiscounted cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future net undiscounted cash flows, an impairment charge is recognized by the amount by which the carrying amount of the asset exceeds the fair value of the asset.

During 2006 and 2005, we determined that indicators of impairment related to our intangible assets existed and an impairment analysis was performed, resulting in an impairment loss to amortizable intangible assets of $3.2 million and $46.9 million, respectively. As a result of the impairment charges, our amortizable intangible assets at December 31, 2007 and December 31, 2006 were zero. At December 31, 2007, our other long-lived assets consisted of $20.8 million of net property and equipment.

Stock-Based Compensation

In the first quarter of 2006, we adopted SFAS No. 123R (revised 2004), Share-Based Payment (SFAS 123R), which requires the measurement and recognition of compensation expense for all share-based payment awards made to employees and directors based on estimated fair values. We adopted the modified prospective method of transition under which prior periods are not restated for comparative purposes. We have estimated the

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fair value of stock-based payment awards on the date of grant using the Black Scholes pricing model, which is affected by our stock price as well as assumptions regarding a number of complex and subjective variables. These variables include our expected stock price volatility over the term of the awards, actual and projected employee option exercise behaviors, risk free interest rate and expected dividends. The expected stock price volatility is based on the weighted average of the historical volatility of our common stock over the most recent period commensurate with the estimated expected life of our stock options and historical volatility of our peers where we lack our own historical information. We base our expected life assumption on our historical experience and on the terms and conditions of the stock awards we grant to employees. Risk free interest rates reflect the yield on zero-coupon U.S. Treasury securities. We do not anticipate paying any cash dividends in the foreseeable future and therefore use an expected dividend yield of zero.

If factors change, and we employ different assumptions for estimating stock-based compensation expense in future periods, or if we decide to use a different valuation model, the future periods may differ significantly from what we have recorded in the current period and could materially affect our operating income, net loss and net loss per share. We are also required to estimate forfeitures at the time of grant and revise those estimates in subsequent periods if actual forfeitures differ from those estimates.

Fair value stock-based compensation expense under SFAS 123R for the year ended December 31, 2007 includes compensation expense for share-based payment awards granted prior to, but not yet vested as of December 31, 2005 based on the grant date fair value estimated in accordance with the pro-forma provisions of SFAS No. 123, Accounting for Stock-Based Compensation, and compensation expense for the share-based payment awards granted subsequent to December 31, 2005 based on the grant date fair value estimated in accordance with the provisions of SFAS 123R. In conjunction with the provisions of SFAS 123R, we changed our method of attributing the value of stock-based compensation to expense from the accelerated method to the straight line method. Compensation expense for all employee share-based payment awards granted on or prior to December 31, 2005 will continue to be recognized using the accelerated method while compensation expense for all share-based payment awards granted subsequent to December 31, 2005 is recognized using the straight line method.

Prior to the adoption of SFAS 123R, we recognized compensation cost for stock options issued or assumed through acquisitions, based on the intrinsic value, which represents the difference between the exercise price of each stock option granted or assumed and the fair market value of the underlying common stock at the grant date or consummation date of the business combination. The resulting deferred stock compensation was amortized over the vesting periods of the applicable options. See Note 6 to the consolidated financial statements for further information. In addition, we have reclassified prior years stock based compensation expense to the associated operating expense line items in the consolidated statements of operations in order to conform to the current year presentation.

In addition, stock-based compensation expense was recorded for options issued to non-employees. These options are generally immediately exercisable and expire seven to ten years from the date of grant. We value non-employee options using the Black Scholes model. Non-employee options subject to vesting are valued as they become vested.

Inventories

Inventories are stated at the lower of cost or market, with cost being determined using the first-in, first-out (FIFO) method. In assessing the net realizable value of inventories, we are required to make judgments as to future demand requirements and compare these with the current or committed inventory levels. Once inventory has been written down to its estimated net realizable value, its carrying value cannot be increased due to subsequent changes in demand forecasts. To the extent that a severe decline in forecasted demand occurs, or we experience a higher incidence of inventory obsolescence due to rapidly changing technology and customer requirements, we may incur significant charges for excess inventory.

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Operating Lease Liabilities

As a result of our acquisition of Paradyne in September 2005, we assumed certain lease liabilities for facilities in Largo, Florida. In accordance with Emerging Issues Task Force Issue No. 95-3, Recognition of Liabilities in Connection with a Purchase Business Combination (EITF 95-3), we accrued a liability for the excess portion of these facilities. The computation of the estimated liability includes a number of assumptions and subjective variables. These variables include the level and timing of future sublease income, amount of contractual variable costs, future market rental rates, discount rate, and other estimated expenses. If circumstances change, and we employ different assumptions in future periods, the lease liability may differ significantly from what we have recorded in the current period and could materially affect our net loss and net loss per share.

RESULTS OF OPERATIONS

We list in the tables below the historical consolidated statement of operations as a percentage of revenue for the periods indicated.

2007 COMPARED WITH 2006

Revenue

Information about our revenue for products and services for 2007 and 2006 is summarized below (in millions):

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Information about our revenue for North America and International markets for 2007 and 2006 is summarized below (in millions):

Information about our revenue by product line for 2007 and 2006 is summarized below (in millions):

Total revenue decreased 10% or $18.9 million to $175.4 million for 2007 compared to $194.3 million for 2006. The decrease in total revenue was due to decreased demand for our legacy, service and other products compared to the prior year, particularly in the domestic region. Additionally, a reduction in customers’ capital expenditure spending contributed to the overall decrease in revenue.

Product revenue accounted for the majority of the total decrease in revenue. In 2007, product revenue decreased 10% or $17.3 million and service revenue decreased 13% or $1.6 million compared to 2006. Service revenue represents revenue from maintenance and other services associated with product shipments.

International revenue increased 9% or $6.9 million to $85.5 million in 2007 and represented 49% of total revenue compared with 40% in 2006. The increase in international revenue represents the increasing opportunity for our next-generation products in both existing and new network deployments among emerging international carriers in Latin America. While we have experienced growth in international markets, we continue to encounter price-focused competitors and we anticipate this will continue as we pursue these markets.

By product family, revenue for our SLMS product family increased $5.0 million or 4% in 2007 compared to 2006 due to increased adoption of IPTV, VoIP and broadband services, creating increased demand for our SLMS products, particularly in international territories. Revenue for our legacy products and services decreased $23.9 million or 31% in 2007 as compared to 2006, supporting the growing shift from legacy technologies to our growing SLMS business. Additionally, we continue to divest non-strategic legacy products in order to focus our efforts on our SLMS product family. For example, during January 2008, we sold our GigaMux legacy product line, during the fourth quarter of 2007, we sold our AccessNode legacy product line, and in 2006, we divested our iMarc legacy product line. The decrease in legacy product revenue was driven by the sale of the iMarc product line at the end of 2006 and expected migration of legacy products to next generation solutions. We anticipate that the product mix will continue to shift toward next generation products within the SLMS product family.

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While no customer accounted for 10% or more of net revenue in 2007, 2006 or 2005, we anticipate that our results of operations in any given period may depend to a large extent on sales to a small number of large accounts. As a result, our revenue for any quarter may be subject to significant volatility based upon changes in orders from one or a small number of key customers.

Cost of Revenue and Gross Profit

Total cost of revenue, including stock-based compensation, decreased $15.3 million, or 12% to $116.4 million for 2007, compared to $131.7 million for 2006. Total cost of revenue was 66% of revenue for 2007, compared to 68% of revenue for 2006. The decrease in cost of revenue for 2007 compared to 2006 was primarily due to a significantly decreased obsolescence provision for legacy products. As compared to 2006, the 2007 provision for obsolescence decreased by $7.1 million. In addition, gains of $4.6 million related to the sale of the Access Node and iMarc product lines during 2007 further reduced cost of revenue as compared to the prior year. Finally, personnel related costs for 2007 decreased over 2006 by $3.3 million due to the operating leverage on fixed manufacturing costs as a result of the consolidation of our manufacturing operations into one facility.

In December 2006, we entered into an agreement to sell inventory and certain assets related to our iMarc legacy product line to a third party. The sale of the iMarc product line was not treated as a discontinued operation since it did not represent a component of our company that had operations and cash flows that were clearly distinguishable, operationally and for financial reporting purposes, from the rest of the entity. Upon performance of certain obligations and delivery of assets in the first quarter of 2007, we recognized a gain of $1.8 million that was recorded in cost of revenue. Upon sale of the remaining iMarc inventory during the second quarter of 2007, we recognized an additional gain to cost of revenue of $1.1 million related to the sale of the legacy iMarc product line.

In December 2007, we sold inventory and certain assets related to our Access Node legacy product line to a third party. The sale of the Access Node product line was not treated as a discontinued operation since it did not represent a component of our company that had operations and cash flows that were clearly distinguishable, operationally and for financial reporting purposes, from the rest of the entity. Upon sale of the Access Node inventory, we recognized a gain of $1.7 million that was recorded in cost of revenue. Additional gain may be recorded in the future contingent upon attainment of certain earnout provisions.

We expect that in the future, our cost of revenue will also vary as a percentage of net revenue depending on the mix and average selling prices of products sold in the future. In addition, competitive and economic pressures could cause us to reduce our prices, adjust the carrying values of our inventory, or record inventory charges relating to discontinued products and excess or obsolete inventory.

Research and Product Development Expenses

Research and product development expenses decreased 9% or $3.4 million to $32.7 million for 2007 compared to $36.1 million for 2006. The decrease was primarily due to approximately $1.4 million in non-recurring specific new product development efforts expended during 2006. We intend to continue to invest in research and product development to attain our strategic product development objectives, while seeking to manage the associated costs through expense controls. Additionally, for the year ended December 31, 2007, approximately $0.7 million of stock-based compensation expense was included in research and product development expenses, compared to $1.6 million during the year ended December 31, 2006. The decrease was primarily due to the decline in stock price as well as reduced volatility rate assumptions, increased forfeitures, and the decline in interest rates.

Sales and Marketing Expenses

Sales and marketing expenses decreased 13% or $5.0 million to $33.2 million for 2007 compared to $38.2 million in 2006. The decrease was primarily attributable to reduced personnel related costs of $1.2 million

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from lower headcount as we realigned our resources to focus on emerging markets, and reduced demonstration and trade show expenses of $1.8 million. Additionally, for the year ended December 31, 2007, approximately $0.6 million of stock-based compensation expense was included in sales and marketing expenses, compared to $1.4 million during the year ended December 31, 2006. The decrease was primarily due to the decline in stock price as well as reduced volatility rate assumptions, increased forfeitures, and the decline in interest rates.

General and Administrative Expenses

General and administrative expenses decreased 27% or $3.8 million to $10.2 million for 2007 compared to $14.0 million for 2006. The decrease was primarily due to the reversal of certain contingent liabilities of $1.1 million in the third quarter of 2007, reduced accounting and legal fees of $1.4 million over the prior year, the reversal of certain liabilities of $0.4 million in the first quarter of 2007, and a $1.5 million favorable legal settlement in the second quarter of 2007, offset by a $0.5 million accrual for acquired lease liabilities during the third quarter of 2007. Additionally, for the year ended December 31, 2007, approximately $1.3 million of stock-based compensation expense was included in general and administrative expenses, compared to $1.6 million during the year ended December 31, 2006. The decrease was primarily due to the decline in stock price as well as reduced volatility rate assumptions, increased forfeitures, and the decline in interest rates.

Gain on sale of fixed assets

Gain on sale of fixed assets increased from zero in 2006 to $0.7 million in 2007. The gain in 2007 was primarily attributable to the sale of fixed assets associated with our sale of the Access Node legacy product line in December 2007.

Gain on sale of intangible assets

Gain on sale of intangible assets increased from zero in 2006 to $5.0 million in 2007. The gain in 2007 was attributable to the sale of non-strategic legacy patents originally acquired from Paradyne.

Amortization of Intangible Assets

There was no amortization of intangible assets for 2007 compared to $2.8 million for 2006 because the intangible assets were fully amortized as of December 31, 2006.

Impairment of Intangible Assets and Goodwill

We review goodwill and other long-lived assets, including intangible assets, for impairment annually or whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. During the third quarter of 2006, we determined that indicators of impairment existed as we experienced an adverse change in our business as evidenced by a decline in our projected revenue due to technology transition issues with our largest international customers, and a resulting decline in our market capitalization. We performed an impairment analysis which resulted in a non-cash goodwill impairment charge of $110.5 million as the fair value of our reporting unit was less than book value. See Note 3 to the consolidated financial statements for further detail. We also recorded a non-cash impairment charge for other intangible assets of $3.2 million, which represented the amount by which the carrying value of the intangible assets exceeded the fair value. No impairment of goodwill or intangible assets was recorded in 2007.

Interest Expense

Interest expense for 2007 decreased by $0.6 million to $2.2 million compared to 2006 due primarily to a decrease in the outstanding debt balances.

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Interest Income

Interest income for 2007 decreased by $0.5 million to $1.8 million compared to 2006 due to lower average balances of cash and short-term investments.

Other Income, Net

Other income for 2007 decreased by $0.2 million to $0.04 million compared to $0.2 million for 2006. The decrease was primarily due to foreign exchange losses of $0.1 million on foreign currencies in the current year compared to exchange gains of $0.2 million in the prior year. We transact business in various foreign countries and are exposed to currency exchange rate risk associated with foreign currency denominated assets and liabilities, primarily intercompany receivables and payables.

Income Tax Provision

During the years ended December 31, 2007 and 2006, we recorded an income tax provision of $0.4 million and $0.3 million, respectively, related to foreign and state taxes. No material provision or benefit for income taxes was recorded, due to our recurring operating losses and the significant uncertainty regarding the realization of our net deferred tax assets, against which we have continued to record a full valuation allowance.

2006 COMPARED WITH 2005

Revenue

Information about our revenue for products and services for 2006 and 2005 is summarized below (in millions):

Information about our revenue for North America and International markets for 2006 and 2005 is summarized below (in millions):

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Information about our revenue by product line for 2006 and 2005 is summarized below (in millions):

Total revenue increased 28% or $42.5 million to $194.3 million for 2006 compared to $151.8 million for 2005. The increase in total revenue was due to incremental revenue from the acquisition of Paradyne in September 2005, offset by lower sales of our legacy, service and other products. Additionally, we experienced increased demand for our SLMS products compared to the prior year, particularly in the international territories.

In 2006, product revenue increased 30% or $42.2 million and service revenue remained consistent with an increase of 2% or $0.3 million compared to 2005. Service revenue represents revenue from maintenance and other services associated with product shipments. The increase in both product and service revenue was due to incremental revenue from the Paradyne acquisition and increased demand for our SLMS products.

International revenue increased 50% or $26.3 million to $78.6 million in 2006 and represented 40% of total revenue compared with 34% in 2005. The significant increase in international revenue represents the increasing opportunity for our next-generation products in both existing and new network deployments among emerging international carriers in the Middle East and Latin America, as well as incremental revenue from Paradyne products.

By product family, revenue for our SLMS product family increased $51.3 million or 77% in 2006 compared to 2005 due to the incremental revenue associated with Paradyne’s broadband products. Revenue also increased due to increased adoption of IPTV, VoIP and broadband services, creating increased demand for our SLMS products, particularly in international territories. Revenue for our legacy products and services decreased $8.8 million or 10% in 2006, supporting the growing shift from legacy technologies to our growing SLMS business. Additionally, we continue to divest non-strategic legacy products in order to focus our efforts on our SLMS product family. For example, during the fourth quarter of 2006, we entered into an agreement to divest our iMarc legacy product line, and in 2005, we divested our Meret, Sechtor, Arca Dacs and eLuminant legacy products. The decrease in legacy products was partially offset by incremental revenue from Paradyne service and narrowband products acquired in September 2005.

Cost of Revenue and Gross Profit

Total cost of revenue, including stock-based compensation, increased $42.8 million, or 48% to $131.7 million for 2006, compared to $89.0 million for 2005. Total cost of revenue was 68% of revenue for 2006, compared to 59% of revenue for 2005. The increase in cost of revenue for 2006 compared to 2005 primarily relates to the increase in revenue from the acquisition of Paradyne in September 2005. The increase in cost of revenue for 2006 compared to 2005 also includes a $7.2 million write off of inventory related to reduced demand of legacy products during the second quarter of 2006 and additional stock-based compensation of $0.7 million related to the implementation of SFAS 123R in January 2006. In addition, 2005 included a net benefit of approximately $2.8 million related to several infrequent transactions, including a benefit related to the sale of non-strategic products and a favorable settlement with a contract manufacturer, offset by charges for discontinued inventory resulting from integration efforts related to the Paradyne acquisition and other charges related to vendor and customer claims. Overall, gross profit also decreased due to the lack of operating leverage on fixed manufacturing costs at lower than anticipated revenue levels as well as lower pricing for strategic international customers.

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Research and Product Development Expenses

Research and product development expenses increased 33% or $9.0 million to $36.1 million for 2006 compared to $27.1 million for 2005. The increase was primarily due to increased investment in research and development and personnel related costs to support development enhancements to our existing products and our new next generation technologies, as well as development support for our acquired technologies. Additionally, for the year ended December 31, 2006, approximately $1.6 million of stock-based compensation expense was included in research and product development expenses, compared to only $0.2 million during the year ended December 31, 2005, primarily due to the implementation of SFAS 123R in January 2006.

Sales and Marketing Expenses

Sales and marketing expenses increased 28% or $8.4 million to $38.2 million for 2006 compared to $29.8 million in 2005. The increase was primarily attributable to higher personnel related costs of $3.3 million to support revenue growth, particularly in the international territories, as well as increased spending on trade shows, travel and other marketing related promotions of $1.8 million. Additionally, for the year ended December 31, 2006, approximately $1.4 million of stock-based compensation expense was included in sales and marketing expenses, compared to only $0.2 million during the year ended December 31, 2005, primarily due to the implementation of SFAS 123R in January 2006.

General and Administrative Expenses

General and administrative expenses decreased 3% or $0.5 million to $14.0 million for 2006 compared to $14.5 million for 2005. The decrease was primarily due to non recurring charges of $1.5 million associated with the Paradyne acquisition in the prior year offset by increased costs to support a larger organization as a result of the Paradyne acquisition and higher bad debt of $0.9 million associated with a customer bankruptcy in the first quarter of 2006. Additionally, for the year ended December 31, 2006, approximately $1.6 million of stock-based compensation expense was included in general and administrative expenses primarily due to the implementation of SFAS 123R, compared to $2.7 million during the year ended December 31, 2005, related to options granted to non-employees for services received in conjunction with the Paradyne acquisition.

Purchased In-Process Research and Development

In 2005, we recorded purchased in-process research and development charges of $1.2 million relating to the acquisition of Paradyne because technological feasibility for certain research and development efforts by Paradyne had not been established and no future alternative uses for these research and development efforts existed.

Amortization of Intangible Assets

Amortization of intangible assets decreased $9.7 million to $2.8 million for 2006 compared to $12.5 million for 2005. The decrease was primarily due to the impairment of intangibles in the third quarter of 2006 and the fourth quarter of 2005 as well as the sale of patents in the second quarter of 2006.

Impairment of Intangible Assets and Goodwill

We review goodwill and other long-lived assets, including intangible assets, for impairment annually or whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. During the third quarter of 2006, we determined that indicators of impairment existed as we experienced an adverse change in our business as evidenced by a decline in our projected revenue due to technology transition issues with our largest international customers, and a resulting decline in our market capitalization. We performed an impairment analysis which resulted in a non-cash goodwill impairment charge of $110.5 million as the fair value of our reporting unit was less than book value. See Note 3 to the consolidated financial statements for further detail. We also recorded a non-cash impairment charge for other intangible assets of $3.2 million, which represented the amount by which the carrying value of the intangible assets exceeded the fair value.

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The impairment charge in 2005 related to the impairment of goodwill of $55.2 million and acquired intangibles of $46.9 million. The primary circumstance leading to the impairment of intangibles was a decline in our projected future cash flows associated with technology and other intangibles acquired from our prior acquisitions. The impairment reflects a more rapid decline in projected revenue from certain legacy products than previously anticipated as customers transition to next generation products.

Interest Expense

Interest expense for 2006 decreased by $0.6 million to $2.8 million compared to 2005 due primarily to a decrease in the outstanding debt balances.

Interest Income

Interest income for 2006 increased by $0.9 million to $2.3 million due to higher average balances of cash and short-term investments.

Other Income (Expense), Net

Other income was $0.2 million for 2006 compared to other expense of $0.5 million for 2005. The change was primarily due to exchange gains on foreign currencies in the current year compared to exchange losses in the prior year. We transact business in various foreign countries and are exposed to currency exchange rate risk associated with foreign currency denominated assets and liabilities, primarily intercompany receivables and payables.

Income Tax Provision

During the years ended December 31, 2006 and 2005, we recorded an income tax provision of $0.3 million and $0.2 million, respectively, related to foreign and state taxes. No deferred tax benefit was recorded due to our operating losses and net operating loss carryforwards. Due to the significant uncertainty regarding the realization of our net deferred tax assets, a full valuation allowance was recorded.

LIQUIDITY AND CAPITAL RESOURCES

Our operations are financed through a combination of our existing cash, cash equivalents and investments, available credit facilities, and sales of equity and debt instruments, based on our operating requirements and market conditions.

At December 31, 2007, cash, cash equivalents and short-term investments were $50.2 million compared to $64.3 million at December 31, 2006. Total debt was $34.4 million at December 31, 2007 as compared to $41.5 million at December 31, 2006. The decrease in cash and cash equivalents of $9.2 million was attributable to net cash used in operating and financing activities of $14.8 million and $6.5 million, respectively, offset by net cash provided by investing activities of $11.6 million and changes in exchange rate of $0.5 million.

Operating Activities

For fiscal year 2007, net cash used in operating activities consisted of the net loss of $12.1 million, adjusted for non-cash charges totaling $8.4 million, and offset by a gain on sale of assets of $5.7 million and increases in net operating assets totaling $5.4 million. The most significant components of the increases in net operating assets in 2007 were an increase in accounts receivable of $4.7 million and a decrease in accrued and other liabilities of $4.0 million, offset by an increase in accounts payable of $2.4 million.

For fiscal year 2006, net cash used in operating activities consisted of the net loss of $142.7 million, adjusted for non-cash charges totaling $130.4 million and changes in operating assets and liabilities totaling $3.9

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million. The most significant components of the changes in operating assets and liabilities in 2006 were a decrease in accrued expenses of $5.2 million and an increase in accounts receivable of $3.1 million, offset by a decrease in inventories of $3.3 million.

Investing Activities

For fiscal year 2007, net cash provided by investing activities consisted primarily of cash acquired through the net sale of short-term investments of $5.4 million and proceeds from the sale of assets of $7.3 million, offset by capital equipment purchases of $1.4 million.

For fiscal year 2006, net cash provided by investing activities consisted primarily of cash acquired through the net sale of short-term investments of $2.2 million and proceeds from the sale of patents and marketable securities of $10.7 million, offset by capital equipment purchases of $2.0 million.

Financing Activities

For fiscal year 2007, net cash used in financing activities consisted primarily of repayment of debt of $7.6 million, partially offset by proceeds from the issuance of common stock of $0.7 million and borrowings under credit facilities of $0.5 million.

For fiscal year 2006, net cash provided by financing activities included proceeds from the issuance of common stock of $2.3 million and proceeds from the repayment of officer loans of $0.6 million, offset by the repayment of debt of $2.7 million primarily associated with a voluntary repayment of $1.5 million of debenture debt, $0.9 million repayment of a note payable and $0.3 million of other principal debt payments on our secured real estate loan.

Cash Management

Our primary source of liquidity comes from our cash and cash equivalents and short-term investments, which totaled $50.2 million at December 31, 2007, and our $25.0 million revolving line of credit and letter of credit facility, and an accounts receivable purchase facility with Silicon Valley Bank, or the SVB Facilities.

Our short-term investments are classified as available-for-sale and consist of securities that are readily convertible to cash, including certificates of deposits, commercial paper and government securities, with original maturities at the date of acquisition ranging from 90 days to one year. At current revenue levels, we anticipate that some portion of our existing cash and cash equivalents and short-term investments will continue to be consumed by operations.

Under the SVB Facilities, we have the option of borrowing funds at agreed upon rates of interest, so long as the aggregate amount of outstanding borrowings does not exceed $25.0 million. In addition, we may sell specific accounts receivables to Silicon Valley Bank, on a non recourse basis, at agreed upon discounts to the face amount of those accounts receivables, so long as the aggregate amount of outstanding accounts receivables does not exceed $10.0 million. The SVB Facilities are renewed on an annual basis, and are currently scheduled to expire in March 2009. There can be no assurance that Silicon Valley Bank will agree to any future renewal of the SVB Facilities.

Under these facilities, $15.0 million was outstanding at December 31, 2007, and an additional $6.5 million was committed as security for various letters of credit. The amounts borrowed under the revolving credit facility bear interest, payable monthly, at a floating rate that, at our option, is either (1) Silicon Valley Bank’s prime rate, or (2) the sum of the LIBOR rate plus 2.9%; provided that in either case, the minimum interest rate is 4.0%. The interest rate was 7.25% at December 31, 2007.

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Our obligations under the SVB Facilities are secured by substantially all of our personal property assets and those of our subsidiaries, including our intellectual property. The SVB Facilities contain certain financial covenants, and customary affirmative covenants and negative covenants. If we do not comply with the various covenants and other requirements under the SVB Facilities, Silicon Valley Bank is entitled to, among other things, require the immediate repayment of all outstanding amounts and sell our assets to satisfy the obligations under the SVB Facilities. As of December 31, 2007, we were in compliance with these covenants.

Future Requirements and Funding Sources

Our fixed commitments for cash expenditures consist primarily of payments under operating leases, inventory purchase commitments, and payments of principal and interest for debt obligations. As a result of the Paradyne acquisition in 2005, we assumed a lease commitment for facilities in Largo, Florida. The term of the lease expires in June 2012 and had an estimated remaining obligation of approximately $21.7 million as of December 31, 2007. We intend to continue to occupy only a portion of these facilities and are evaluating our options to exit the excess portion of the lease. We have recorded a liability of $3.7 million as of December 31, 2007 in accordance with Emerging Issues Task Force Issue No. 95-3, Recognition of Liabilities in Connection with a Purchase Business Combination (EITF 95-3), which we believe is adequate to cover costs incurred to exit the excess portion of these facilities.

As a result of the financial demands of major network deployments and the difficulty in accessing capital markets, network service providers continue to request financing assistance from their suppliers. From time to time, we may provide or commit to extend credit or credit support to our customers. This financing may include extending credit to customers. Depending upon market conditions, we may seek to factor these arrangements to financial institutions and investors to reduce the amount of our financial commitments associated with such arrangements. For example, during the year ended December 31, 2007, we sold $2.0 million of customer trade receivables to financial institutions on a non-recourse basis in exchange for cash. The sale of the receivables did not represent a securitization, and there was no continuing involvement or interests in the receivables by us after the sale. Our ability to provide customer financing is limited and depends upon a number of factors, including our capital structure, the level of our available credit and our ability to factor commitments to third parties. Any extension of financing to our customers will limit the capital that we have available for other uses. As of December 31, 2007, we did not have any significant customer financing commitments.

In March 2004, we filed a Form S-3 Registration Statement which allows us to sell, from time to time, up to $100 million of our common stock or other securities. Although we may use this multi-purpose shelf registration to raise additional capital, there can be no certainty as to when or if we may offer any securities under the shelf registration or what the terms of any such offering would be.

Our accounts receivable, while not considered a primary source of liquidity, represents a concentration of credit risk because a significant portion of the accounts receivable balance at any point in time typically consists of a relatively small number of customer account balances. As of December 31, 2007, no customers accounted for more than 10% of accounts receivable, and receivables from customers in territories outside of the United States of America represented 63% of accounts receivable. We do not currently have any material commitments for capital expenditures, or any other material commitments aside from operating leases for our facilities, inventory purchase commitments and debt.

We expect that operating losses and negative cash flows from operations will continue for at least the next year. Based on our current plans and business conditions, we believe that our existing cash, cash equivalents and short-term investments and available credit facilities will be sufficient to satisfy our anticipated cash requirements for the foreseeable future. For example, we generated additional cash through the sale of our GigaMux legacy product line during January 2008. However, we may require additional funds if our revenues or expenses fail to meet our current projections or to support other purposes and we may need to raise additional funds through debt or equity financing or from other sources. There can be no assurances that additional funding

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will be available at all, or that if available, such financing will be obtainable on terms favorable to us. If we were to raise funds through the issuance of debt securities or other debt financing, the terms of such debt may include covenants, restrictions and financial ratios that may restrict our ability to operate our business. If we are unable to obtain additional capital or are required to obtain additional capital on terms that are not favorable to us, we may be required to reduce the scope of our planned product development and sales and marketing efforts.

Contractual Commitments and Off-Balance Sheet Arrangements

At December 31, 2007, our estimated future contractual commitments by fiscal year were as follows (in thousands):

Operating Leases

The operating lease amounts shown above represent primarily off-balance sheet arrangements. For operating lease commitments, a liability is generally not recorded on our balance sheet unless the facility represents an excess facility for which an estimate of the facility exit costs has been recorded on our balance sheet. For operating leases that include contractual commitments for operating expenses and maintenance, estimates of such amounts are included based on current rates. Payments made under operating leases will be treated as rent expense for the facilities currently being utilized. Of the total $22.9 million operating lease amount, $3.7 million has been recorded as a liability on our balance sheet as of December 31, 2007.

Line of Credit and Debt

The debt and line of credit obligations have been recorded as liabilities on our balance sheet. The debt obligation amounts shown above represent the scheduled principal repayments, but not the associated interest payments which may vary based on changes in market interest rates. At December 31, 2007, the interest rate on our outstanding debt obligations ranged from 7.25% to 8.1%.

As of December 31, 2007, we had $15.0 million outstanding under our line of credit and an additional $6.5 million committed as security for various letters of credit, as discussed in Note 5 to the consolidated financial statements.

Inventory Purchase Commitments

Inventory purchase commitments represent the amount of excess inventory purchase commitments that have been recorded as a liability on our balance sheet at December 31, 2007.

Recent Accounting Pronouncements

SFAS 157 – Fair Value Measurements

In September 2006, the FASB issued SFAS No. 157, Fair Value Measurements (SFAS 157) which defines fair value, establishes guidelines for measuring fair value and expands disclosures regarding fair value measurements. SFAS 157 does not require any new fair value measurements but rather eliminates inconsistencies in guidance found in various prior accounting pronouncements. SFAS 157 is effective for fiscal years beginning

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after November 15, 2007 for financial assets and liabilities and for fiscal years beginning after November 15, 2008 for non-financial assets and liabilities. Earlier adoption is permitted, provided we have not yet issued financial statements, including for interim periods, for that fiscal year. We will be required to adopt SFAS 157 in our 2008 fiscal year for financial assets and liabilities and in our 2009 fiscal year for non-financial assets and liabilities. We are currently evaluating the impact of SFAS 157, but do not expect the adoption of SFAS 157 to have a material impact on our consolidated financial statements.

FIN 48 – Accounting for Uncertainty in Income Taxes

In July 2006, the FASB issued Financial Interpretation No. 48, Accounting for Uncertainty in Income Taxes—an interpretation of FASB Statement No. 109 (FIN 48), which is a change in accounting for income taxes. FIN 48 specifies how tax benefits for uncertain tax positions are to be recognized, measured, and derecognized in financial statements; requires certain disclosures of uncertain tax matters; specifies how reserves for uncertain tax positions should be classified on the balance sheet; and provides transition and interim period guidance, among other provisions. We were required to adopt FIN 48 in fiscal year 2007. The adoption of FIN 48 did not have a material impact on our consolidated financial statements.

SFAS 159 – Fair Value Option for Financial Assets and Financial Liabilities

In February 2007, the FASB issued SFAS No. 159, The Fair Value Option for Financial Assets and Financial Liabilities (SFAS 159). SFAS 159 permits companies to choose to measure certain financial instruments and certain other items at fair value. The standard requires that unrealized gains and losses on items for which the fair value option has been elected be reported in earnings. SFAS 159 is effective for us beginning in the first quarter of fiscal year 2008, although earlier adoption is permitted. We are currently evaluating the impact, if any, that the adoption of SFAS 159 will have on our consolidated financial statements.

SFAS 141R – Business Combinations

In December 2007, the FASB issued SFAS No. 141 (revised 2007), Business Combinations (SFAS 141R), which replaces SFAS No. 141. SFAS 141R establishes principles and requirements for how an acquirer recognizes and measures in its financial statements the identifiable assets acquired, the liabilities assumed, any non controlling interest in the acquiree and the goodwill acquired. The Statement also establishes disclosure requirements which will enable users to evaluate the nature and financial effects of the business combination. SFAS 141R is effective for fiscal years beginning after December 15, 2008. We will be required to adopt SFAS 141R in our 2009 fiscal year. We are currently evaluating the impact, if any, that the adoption of SFAS 141R will have on our consolidated financial statements.

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ITEM 7A.    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Cash, Cash Equivalents and Investments

We consider all cash and highly liquid investments purchased with an original maturity of less than three months to be cash equivalents.

Cash, cash equivalents and short-term investments consisted of the following as of December 31, 2007 and 2006 (in thousands):

Concentration of Credit Risk

Financial instruments which potentially subject us to concentrations of credit risk consist primarily of cash and cash equivalents, short-term investments and accounts receivable. Cash and cash equivalents and short-term investments consist principally of demand deposit and money market accounts, commercial paper and corporate debentures and bonds with credit ratings of AA or better. Cash and cash equivalents and short-term investments are principally held with various domestic financial institutions with high credit standing. As of December 31, 2007 and 2006, receivables from customers in international territories represented 63% and 48%, respectively, of accounts receivable.

Interest Rate Risk

Our exposure to market risk for changes in interest rates relates primarily to our investment portfolio and long-term debt. We do not use derivative financial instruments in our investment portfolio. We do not hold financial instruments for trading or speculative purposes. We manage our interest rate risk by maintaining an investment portfolio primarily consisting of debt instruments of high credit quality and relatively short average maturities. Our cash and cash equivalents and short-term investments are not subject to material interest rate risk due to their short maturities. Under our investment policy, short-term investments have a maximum maturity of one year from the date of acquisition, and the average maturity of the portfolio cannot exceed six months. Due to the relatively short maturity of the portfolio, a 10% increase in market interest rates at December 31, 2007 would decrease the fair value of the portfolio by less than $0.1 million.

As of December 31, 2007, our outstanding long-term debt balance was $19.1 million. Interest on our long-term debt accrues on the unpaid principal balance at a variable interest rate (which adjusts every six months) equal to the sum of the LIBOR rate plus 3.0% per annum; provided that in no event will the variable interest rate (a) exceed 14.2488% per annum, (b) be less than 6.5% per annum, or (c) be adjusted by more than 1.0% at any adjustment date. Assuming the outstanding balance on our variable rate long-term debt remains constant over a year, a 2% increase in the interest rate would decrease pre-tax income and cash flow by approximately $0.4 million.

Foreign Currency Risk

We transact business in various foreign countries. Substantially all of our assets are located in the United States. We have sales operations throughout Europe, Asia, the Middle East and Latin America. We are exposed to foreign currency exchange rate risk associated with foreign currency denominated assets and liabilities, primarily inter-company receivables and payables. Accordingly, our operating results are exposed to changes in exchange rates between the U.S. dollar and those currencies. During 2007 and 2006, we did not hedge any of our foreign currency exposure. During 2007 and 2006, we recorded a $0.1 million foreign exchange loss and a $0.2 million foreign exchange gain, respectively, in other income (expense) on our statements of operations.

We have performed sensitivity analyses as of December 31, 2007 and 2006, using a modeling technique that measures the change in the fair values arising from a hypothetical 10% adverse movement in the levels of foreign currency exchange rates relative to the U.S. dollar, with all other variables held constant. The sensitivity analyses indicated that a hypothetical 10% adverse movement in foreign currency exchange rates would result in a foreign exchange loss of $1.3 million and $1.2 million at December 31, 2007 and 2006, respectively. This sensitivity analysis assumes a parallel adverse shift in foreign currency exchange rates, which do not always move in the same direction. Actual results may differ materially.

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ITEM 8.    FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

ZHONE TECHNOLOGIES, INC. AND SUBSIDIARIES

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Stockholders

Zhone Technologies, Inc.:

We have audited the accompanying consolidated balance sheets of Zhone Technologies, Inc. and subsidiaries (“the Company”) as of December 31, 2007 and 2006, and the related consolidated statements of operations, stockholders’ equity and cash flows for each of the years in the three-year period ended December 31, 2007. These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these consolidated 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 consolidated financial statements referred to above present fairly, in all material respects, the financial position of Zhone Technologies, Inc. and subsidiaries as of December 31, 2007 and 2006, and the results of their operations and their cash flows for each of the years in the three-year period ended December 31, 2007, in conformity with U.S. generally accepted accounting principles.

As discussed in Note 1 to the consolidated financial statements, the Company adopted SFAS No. 123(R), Share-Based Payment, applying the modified prospective method at the beginning of fiscal year 2006.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), Zhone Technologies, Inc.’s internal control over financial reporting as of December 31, 2007, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO), and our report dated March 6, 2008 expressed an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting.

/s/ KPMG LLP

Mountain View, California

March 6, 2008

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Stockholders

Zhone Technologies, Inc.:

We have audited Zhone Technologies, Inc.’s internal control over financial reporting as of December 31, 2007, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Zhone Technologies, Inc.’s 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, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included 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, Zhone Technologies, Inc. maintained, in all material respects, effective internal control over financial reporting as of December 31, 2007, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of Zhone Technologies, Inc. and subsidiaries as of December 31, 2007 and 2006, and the related consolidated statements of operations, stockholders’ equity and cash flows for each of the years in the three-year period ended December 31, 2007, and our report dated March 6, 2008 expressed an unqualified opinion on those consolidated financial statements.

/s/ KPMG LLP

Mountain View, California

March 6, 2008

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ZHONE TECHNOLOGIES, INC. AND SUBSIDIARIES

Consolidated Balance Sheets

December 31, 2007 and 2006

(In thousands, except par value)