June 16, 2008

Sycamore Optical Mesh Solution Selected By China Netcom for Jilin Province ASON Backbone Network

Sycamore Networks, Inc. (NASDAQ: SCMR), a leader in intelligent bandwidth management solutions for network operators worldwide, today announced that Jilin Netcom, a subsidiary of China Netcom, has selected the Company's SN 16000 Intelligent Optical Switch and SILVX(R) Network Management System (NMS) for a province-wide Automatic Switched Optical Network (ASON) deployment. The ASON-based optical mesh solution, provided via the Company's global strategic alliance with Nokia Siemens Networks, will enable Jilin Netcom to deliver flexible bandwidth services, simplify end-to-end provisioning, and create a resilient and scalable foundation for a broad range of value-added voice, video, and data services.

"We are proud to be playing an important role in China Netcom's evolving communications infrastructure," said Daniel E. Smith, Sycamore's president and chief executive officer. "We remain committed to delivering best-in-breed optical networking solutions, and our leadership in end-to-end control plane intelligence continues to serve as the cornerstone for operational efficiencies and service resiliency in our customers' next-generation optical networks."

Jilin Province is located in the northeast of China and has a population of approximately 27 million. Jilin Netcom's multi-city ASON deployment will leverage the SN 16000's embedded ASON/GMPLS control plane intelligence and distributed network awareness for automated provisioning, enhanced end-to-end performance management, and tiered service offerings.

The SN 16000 Intelligent Optical Switch supports diverse applications while setting new benchmarks for modularity, network resiliency, and system scalability. Consolidating multiple network functions (BB-DCS, ADM, MSPP, OXC, DWDM) in one highly scalable platform delivers high-density, multiservice aggregation with maximum flexibility and efficiency. Ethernet Packet Intelligence - intelligent policing and packet-to-circuit mapping - builds on the efficiency and interoperability enabled by ITU-T standards (VCAT, LCAS, GFP) to achieve improved Ethernet services manageability. Together, modular architecture and intelligent bandwidth management create a more robust, resilient infrastructure that optimizes network and service performance while reducing costs and complexity.

The SILVX software suite offers innovative, integrated, and scalable solutions for simplifying the end-to-end provisioning and management of high-speed bandwidth services. SILVX network management and design software ensures Sycamore solutions integrate smoothly, and deliver full FCAPS management functions and carrier-class reliability, while optimizing networks for multiservice flexibility and circuit/packet convergence.

About China Netcom

China Netcom Group Corporation (Hong Kong) Limited is a leading broadband and fixed-line communications operator in China. Its service region consists of Beijing Municipality, Tianjin Municipality, Hebei Province, Henan Province, Shandong Province, Liaoning Province, Heilongjiang Province, Jilin Province, Inner Mongolia Autonomous Region and Shanxi Province. The Company provides fixed-line voice, value-added services, broadband and other internet-related services, information and communications technology (ICT), business & data communications services and advertising and media services.

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. These risks and uncertainties include, but are not limited to, the findings, including possible tax liabilities and penalties resulting from the audit of certain of the Company's income tax returns by the Internal Revenue Service; risks relating to the formal investigation commenced by the Securities and Exchange Commission, such as a civil proceeding which may seek, among other things, injunctive relief and a civil penalty, with respect to certain stock options granted by the Company; the investigation by the U.S. Attorney's office with respect to stock option matters; and other additional actions and findings that may result from the ongoing investigation into such stock options and the accounting therefore, 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 competitive factors including new product introductions impacting customer orders; 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.