Sycamore Showcases Unified Control Plane Technology In Multi-Vendor IP/Optical Demonstration and eScience Application.

CHELMSFORD, Mass. -- Sycamore Networks, Inc. (NASDAQ: SCMR), a leader in intelligent optical networking, today announced that the Company successfully demonstrated IP/Optical control plane interoperability at a multi-vendor industry event that featured IPTV and other advanced services running over an intelligent optical core.

At Isocore's 6th Public Interoperability Demonstration, held in conjunction with the MPLS 2005 International Conference, Sycamore SN 16000 intelligent optical switches formed the core of a multi-vendor IP/Optical network configuration interconnected via a Generalized Multi-Protocol Label Switching (GMPLS) control plane. The IP/Optical interoperability demonstration also showcased advanced services and applications such as IPTV, Multicast Layer 3 VPNs, and Virtual Private LANs running over the GMPLS-enabled core. Standards-based GMPLS control plane protocols, developed in the Internet Engineering Task Force (IETF), enhance coordination between the IP and optical layers of the network, and enable service providers to simplify service provisioning, improve operational efficiencies, and create new, more agile high-speed services.

"The flexible integration of IP and optical networking devices such as optical switches is a powerful tool for network operators," said Dr. Bijan Jabbari, President of Isocore. "Unified control plane technology such as GMPLS provides the efficient framework for this multi-layer integration and enables network operators to lower operations costs and reduce network complexity."

During the MPLS 2005 conference Sycamore also presented a case study on the implementation of GMPLS in a research network testbed designed to support end-to-end provisioning of dynamic optical bandwidth for large-scale eScience and other high-speed research applications. Sycamore SN 16000 optical switches, Universal Service Card (USC), and control plane technology have been deployed in the CHEETAH (Circuit-switched High-speed End-to-End Transport ArcHitecture) network, an experimental high-speed communications initiative sponsored by the National Science Foundation. The four participating institutions in the CHEETAH project are University of Virginia, Oak Ridge National Laboratory, North Carolina State University, and City University of New York.

"The CHEETAH network leverages the latest advances in optical networking technologies including dynamic bandwidth establishment and Ethernet-over-SONET," said Malathi Veeraraghavan, director of computer engineering, University of Virginia. "Sycamore technology plays an important role in this project, which is designed to enhance the productivity of geographically distributed research teams by enabling the fast and efficient transfer of massive amounts of data required for today's eScience and supercomputer applications."

Sycamore Networks is a leader in the development and implementation of standards-based control plane technology, with an open systems architecture designed to support industry initiatives such as the IETF's GMPLS protocols; the Optical Internetworking Forum's UNI and NNI interfaces; and the International Telecommunication Union, Telecommunication Standardization Sector's (ITU-T) Automatic Switched Optical Network (ASON) reference architecture. Sycamore optical switching solutions support emerging control plane standards and traditional provisioning processes and protection mechanisms on the same platform, which enables network operators to pragmatically and non-disruptively introduce advanced features into their network.

About Isocore

The goal of Isocore's Internetworking Lab is to advance internetworking through technology validation and product verification and to promote development and rapid deployment of innovative networking technologies. For more information about Isocore's Internetworking Lab visit the web site at www.isocore.com.

About CHEETAH

Sponsored by the National Science Foundation, the CHEETAH (Circuit-switched High-speed End-to-End Transport ArcHitecture) network project is an end-to-end provisioned optical network testbed for large-scale eScience applications. For more information please visit: http://cheetah.cs.virginia.edu/

About Sycamore Networks

Sycamore Networks, Inc. (NASDAQ: SCMR) is a leading provider of intelligent optical switching products for telecommunications service providers worldwide. The company's products form the reliable foundation for some of the world's most respected and innovative communications networks. Sycamore's fully integrated edge-to-core optical switching solutions enable network operators to efficiently and cost-effectively provision and manage optical network capacity to support a wide range of voice, video, and data services. 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 that involve risks and uncertainties. Readers are cautioned that actual results or events could differ materially from those stated or implied in forward-looking statements. These risks and uncertainties include, but are not limited to, additional actions and findings that may result from the restatement of previously issued financial statements, the Company's reliance on a limited number of customers, the significant cost structure required to support the Company's strategy, variation of the Company's quarterly results and competition in the telecommunications industry. Certain additional risks are set forth in more detail in the section entitled Factors that May Affect Future Results under Item 2 in Management Discussion and Analysis of Financial Conditions and Results of Operations in the Company's most recently filed Form 10-Q, Form 10-K and the other reports filed by the Company from time to time 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.