Corrigent's CM-100 Utilizes Technology Selected One of Year's 10 Hottest; Telecommunications Magazine Names TDM over MPLS One of Top Trends of 2003.

Business Editors/High-Tech Writers

SAN JOSE, Calif.--(BUSINESS WIRE)--April 8, 2003

Corrigent Systems, a leading provider of packet-ADM (Add Drop Multiplexer) transport systems for metropolitan networks, today announced that a key component of its CM-100(TM) solution, TDM over MPLS, has been selected as one of the 10 Hottest Technologies for 2003 by Telecommunications Magazine. This recognition continues to show Corrigent's superior product architecture and dedication to offering a complete, carrier class solution that leverages the latest in technical innovation.

Corrigent's CM-100 delivers both Ethernet and TDM/SONET-based services over a packet based network. With the CM-100 solution, TDM/SONET-based services are carried over MPLS tunnels over an RPR ring in a packetized form that enables both bandwidth efficiency and lower cost architecture.

"Corrigent Systems recognized early on that metro solutions needed support for legacy TDM/SONET services," said Sam Masud, senior editor at Telecommunications Magazine. "By utilizing MPLS as a common bearer layer, Corrigent was able to offer this legacy support using a new, more economical approach."

TDM/SONET grooming, aggregation and cross-connect functionalities are natively supported over the packet ring at virtually no additional cost, because there is no need for a SONET switch fabric, thus dramatically reducing the costs normally associated with providing these SONET services. Additionally TDM and SONET based legacy data services, such as Frame Relay, ATM and Packet-over-SONET can be carried in their native form which allows a dramatic reduction in the required bandwidth associated with these services. MPLS is used to provide both end-to-end automatic provisioning capabilities and guarantee isolation between different users' services, either in a mesh-of-rings metro topology or across a long-haul network, making MPLS the preferred method to provide traffic engineering. Moreover, MPLS ensures end-to-end interoperability between different vendors' transport systems.

In addition to TDM/SONET based services, the CM-100 can also deliver new Ethernet services over this same MPLS architecture. Standard Ethernet frames are carried over MPLS tunnels over the RPR ring. This approach allows both Point-to-Point virtual leased line Ethernet services, whether port or VLAN based, as well as, multipoint based Virtual Private LAN service (VPLS) to be supported in a common, economical manner, making Corrigent's solution truly evolutionary in nature.

"Packet based networks have long been recognized for their efficiencies and economics," said Shane Eleniak, VP Product Management and Sales, Corrigent Systems. "By transporting TDM and SONET in packet format, huge economic savings can also be applied to both the legacy data and voice traffic found in today's networks, a valuable benefit to all carriers."

About Corrigent Systems

Corrigent Systems 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. Corrigent is based in San Jose, with an R&D center in Israel. Orckit Communications (Nasdaq:ORCT) is a majority shareholder 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.