Corrigent Systems Demonstrates IEEE 802.17 RPR.

CHICAGO -- Corrigent Systems, a leading provider of packet-ADM (Add Drop Multiplexer) for next-generation transport networks, today announced that it will be demonstrating Resilient Packet Ring (RPR) protection switching, supporting the recently completed IEEE 802.17 standard. Corrigent's RPR sub-50msec protection switching will be demonstrated over a 10Gbps ring of its CM-100 Packet ADM as part of the Metro Ethernet Forum (MEF) live multi-vendor interoperability showcase at SUPERCOMM 2004 booth #20736.

This display is part of a larger demonstration by members of the MEF showing capabilities of the latest service provider equipment to support different aspects of Ethernet services delivery. Corrigent is supporting E-Line and E-LAN services as defined by the MEF and will show the ability to protect services from interruption in the event of physical disruption of the ring, in a manner compliant with the requirements outlined in the recently published MEF 2 technical specification: "Requirements and Framework for Ethernet Service Protection in Metro Ethernet Networks".

RPR is poised to be the prevalent packet-based traffic management layer for transport networks. It provides the ability within the transport network to distinguish between low-priority traffic that can be overbooked and high-priority traffic that has to be guaranteed in strict performance, thus enabling service providers to match transport cost to service revenues. It delivers that along with sub-50msec protection switching times for all types of traffic, as well as novel automated provisioning and topology discovery mechanism.

"The recently approved IEEE 802.17 RPR standard brings efficiencies to the transport network that can fundamentally change the cost-structure of data and TDM services delivery," said Michael Howard, Principal Analyst and Co-founder of Infonetics Research. "By using RPR, carriers can mix voice, video, and data applications on one converged packet-optimized network with the carrier-class resiliency of the dual ring architecture."

"Corrigent is pleased to show the capability of our Packet ADM equipment to provide the same level of protection for data as has traditionally been available in voice networks, all while supporting the IEEE 802.17 standard," said Leon Bruckman, Vice President and Chief Architect for Corrigent Systems and co-editor of the new IEEE standard. "We've been involved in creating the RPR standard for several years, and this demonstration is another important step in the acceptance of RPR as an essential ingredient in today's data-centric transport networks."

About Corrigent

Corrigent leads a new class of metro-optical transport products that is revolutionary in its economics. Corrigent's CM-100 is a packet-ADM that fuses together SONET/SDH technologies such as Virtual Concatenation, GFP, and LCAS, with packet technologies such as RPR, Ethernet and MPLS, to evolve today's SONET/SDH-based transport infrastructure to the next generation packet-based transport network, in both a standards-based and interoperable manner. This breakthrough architecture solves the metro dilemma for service providers worldwide by allowing them to bridge their existing SONET services with next-generation data, voice and video services. Orckit Communications (Nasdaq:ORCT) is the parent company of Corrigent. For more information visit Corrigent at: www.corrigent.com.

Corrigent Systems and CM-100 are registered trademarks of Corrigent Systems, Inc. All other Brands and products referenced herein are the trademarks or registered trademarks of their respective holders. Certain matters discussed in this release are forward-looking statements that involve risks and uncertainties. Readers are cautioned that forward-looking statements may differ significantly from actual future events or results. Corrigent assumes no obligation to update the information in this release.