04/16/2009

Sycamore Selected by NTT Communications for Multiservice Access Solution

High-Performance DNX Bandwidth Management Platform Consolidates Access and Delivery for Packet and Circuit-Based Services

Chelmsford, Mass. - Sycamore Networks, Inc. (NASDAQ: SCMR) today announced that NTT Communications (NTT Com), a global provider of information and communications technology solutions, has selected Sycamore DNX-11/88 and ENvision Plus multiservice access and network management platforms to perform key service access and delivery roles in NTT Com’s global multiservice network. The DNX multiservice access platform aggregates, grooms, and enhances a wide variety of network services – ranging from traditional leased lines to dynamic IP VPNs – while providing automated protection mechanisms for specific service types. The DNX platform allows NTT Com to upgrade existing network nodes and functions with a single intelligent system, leading to simpler operations, space savings, cost optimization, and improved economies of scale, now and as the network grows. "We are extremely pleased that NTT Com has chosen to partner with Sycamore as they evolve the access portion of their multiservice network," said Daniel E. Smith, Sycamore’s president and chief executive officer. "NTT Com is widely recognized for their award-winning services portfolio, and we look forward to helping them continue their track record of success with our DNX solutions." DNX systems also provide strong monitoring and diagnostic capabilities that support remote management and unattended operation while maintaining a high level of network availability. ENvision Plus network management software works with DNX platforms to automate and simplify provisioning, streamline event and alarm management processes through filtering tools, and provide visual test access and line diagnostics. Other capabilities include multi-level topology views, advanced bandwidth reporting utilities for switch fabric management, and an architecture that simplifies integration into NTT Com’s existing operational support systems. About NTT Communications Corporation NTT Com delivers high-quality voice, data and IP services to customers around the world. The company is renowned for its diverse information and communication services, expertise in managed networks, hosting and IP networking services, and industry leadership in IPv6 transit technology. The company’s extensive global infrastructure includes Arcstar™ private networks and a Tier 1 IP backbone (connected with major ISPs worldwide), both reaching more than 150 countries, as well as secure data centers in Asia, North America and Europe. NTT Com is the wholly owned subsidiary of Nippon Telegraph and Telephone Corporation, one of the world’s largest telecoms with listings on the Tokyo, London and New York stock exchanges. Please visit www.ntt.com/index-e.html. 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.

Contact:

Investor Inquiries Investor Relations Sycamore Networks, Inc. Phone: 978-250-3460 investor.info@sycamorenet.com

Press Inquiries Public Relations Sycamore Networks, Inc. Phone: 978-250-3433 media.info@sycamorenet.com