Arizona Utility Deploys Sycamore Multiservice Networking Solution.

CHELMSFORD, Mass. -- Sycamore Networks, Inc. (NASDAQ: SCMR) today announced that Arizona's largest and longest-serving electric utility, is deploying the Sycamore DNX multiservice cross-connect platform in the backbone of its voice and data communications infrastructure. Arizona Public Service (APS) will use the Sycamore multiservice solution to enhance network reliability and improve bandwidth efficiencies.

"We are very pleased to deliver APS a high-performance solution that meets their critical networking needs," said Daniel E. Smith, president and CEO, Sycamore Networks. "Utility operators such as APS depend on their infrastructure networks to ensure the highest degree of service availability. With advanced service protection and innovative bandwidth management capabilities, our multiservice switching solutions are optimized to help our customers achieve greater levels of reliability and flexibility, while improving operational efficiencies."

Proven in many of the industry's leading utility networks, the DNX-11/88 multiservice cross-connect platforms combine service interface density with intelligent bandwidth management features, enabling utility network operators to meet a broad range of aggregation and grooming applications, reduce network cost and complexity, and deliver resilient network services. With a non-blocking switching fabric that can accommodate a broad range of bandwidth levels up to OC-3/STM-1 optical transport, the DNX provides the power of a large footprint digital cross-connect (DCS) in a compact, scalable platform, with a unique IP forwarding engine and integrated test access and diagnostic features.

About Arizona Public Service

APS, Arizona's largest and longest-serving electric utility, serves about 1.1 million customers in 11 of the state's 15 counties. In 2008, Phoenix-based APS won its second Edison Award in recognition of innovative leadership and operational excellence in the electric industry. Given annually by the Edison Electric Institute, the Edison Award is considered the industry's most prestigious honor.

About Sycamore Networks

Sycamore Networks, Inc. (NASDAQ: SCMR) is a leading provider of intelligent bandwidth management solutions for fixed line and mobile network operators worldwide. From multiservice access networks to the optical core, Sycamore products enable network operators to lower overall network costs, increase operational efficiencies, and rapidly deploy new revenue-generating services. Sycamore's global customer base includes Tier 1 service providers, government agencies, and utility companies. For more information, please visit www.sycamorenet.com.

We wish to caution you that certain matters discussed in this news release constitute forward-looking statements regarding future events that involve risks and uncertainties. Readers are cautioned that actual results or events could differ materially from those stated or implied in the forward-looking statements. Other risks and uncertainties include, but are not limited to, actions, inquiries and findings that may result from certain stock option matters, including the restatement of previously issued financial statements and certain purported shareholder derivative actions filed against the Company and certain of its current and former officers and directors; the Company's reliance on a limited number of customers; variation in the Company's quarterly results; industry pricing pressures and the high cost of product development required to remain competitive and keep pace with evolving features and technologies desired by customers; the consolidation of both suppliers and customers in the telecommunications marketplace and general economic conditions. Certain additional risks are set forth in more detail in the section entitled "Risk Factors" in the Company's most recent Quarterly Report on Form 10-Q and Annual Report on Form 10-K filed by the Company with the Securities and Exchange Commission. The Company disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future results or otherwise.