Corrigent announces Co-Marketing Agreement with Larscom; Solution Enables Carriers a More Economical Option for Delivering Ethernet and Legacy Data Services.

Business Editors/High-Tech Writers

SUPERCOMM 2003

Booth No. 12049

ATLANTA--(BUSINESS WIRE)--June 3, 2003

Corrigent Systems, a leading provider of packet-ADM (Add Drop Multiplexer) transport systems for metropolitan networks, today announced a co-marketing agreement with Larscom Incorporated (Nasdaq:LARS), a leading provider of WAN connectivity and network access equipment. This agreement will enable Corrigent to combine the carrier class offerings of its CM-100 product line with Larscom's Orion 7400(TM) SONET Multi-Service Access solution, as a way to economically extend services from the edge of metro networks, through the access network to customer sites. The capabilities of both products will be demonstrated at Corrigent's booth, 12049, at Supercomm 2003, from June 3rd-June 5th.

"Corrigent's CM-100 packet-ADM is already recognized as one of the most economic solutions for multi-service metro networks," said Nigel Cole, vice president business development at Corrigent. "By leveraging Larscom's Orion 7400 we can extend our compelling business case to the access network. Together, the CM-100 and Orion 7400 establish new economics for carriers looking to migrate TDM services to packet-based services."

The new Larscom Orion 7400 is rapidly gaining awareness as one of the first economical solutions for customer located equipment. It sets a new standard for small (1.75 inches high) customer located, multi-service SONET access multiplexers. It was designed to economize the extension of Metro Rings to customers located in lower density areas or multi-tenant buildings and enable carriers to deliver flexible, incremental level Ethernet-based bandwidth services as well as traditional TDM services on a mass market basis. Under the terms of the non-exclusive agreement the CM-100 and Orion 7400 are expected to be actively marketed to select customers as a joint solution for Metro Ring expansion and service delivery to the customer location for both traditional TDM and Ethernet (10/100 Ethernet and Gigabit Ethernet) services.

"Corrigent's CM-100 metro solution delivers services through Larscom's new Orion 7400 at the customer location, enabling the carrier a more economic option for delivering Ethernet services without abandoning traditional TDM offerings," said Gurdip Jande, vice president of marketing at Larscom. "While Larscom's Orion 7400 is based on the Ethernet over SONET (EoS) standard and is interoperable with the carrier's existing network and operating environment; it is important for us to demonstrate interoperability with the next generation Metro ADMs, such as the CM-100, that are helping to shape the future of provider networks."

About the CM-100

Corrigent introduces a carrier-class packet-ADM for the next-generation transport network, revolutionary in its economics, and future proof for the rapidly increasing demand of data services. Corrigent's CM-100 delivers the complete suite of Ethernet and SONET/SDH-based services over a shared packetized transport network. The CM-100 bandwidth management scheme, based on standards-based RPR, enables an order of magnitude improvement in bandwidth utilization, while guaranteeing five-nines availability for all services.

About the Orion 7400

Announced on May 19, 2003, the Orion 7400 is a next generation SONET Multi-Service Access Platform designed to economically extend carriers' existing SONET infrastructure to allow the delivery of Ethernet and TDM services at a fraction of the cost of utilizing traditional ADMs at the customer location. The Orion 7400 is based on the EoS standards -- including Generic Framing Procedure (GFP) for multi-vendor compatibility, both Low- (VT 1.5) and High- (STS-1) order Virtual Concatenation (VCAT) for granular and efficient use of SONET bandwidth, and Link Capacity Adjustment Scheme (LCAS) to dynamically provision bandwidth on demand. The system features a small 1RU (1.74 inches high), energy efficient (18-20 watts) design that supports powerful management capabilities including TL-1 and SNMP, SONET DCC (both IP and OSI), RS-232 and Ethernet, and dial up modem access.

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.

About Larscom

Larscom (Nasdaq:LARS) was founded more than three decades ago on a single vision: to enable high-speed access by providing the most cost-effective, highly reliable (carrier-class), and easiest-to-use network access equipment in the industry. Larscom's customers include major carriers, Internet service providers, independent telcos, Fortune 500 companies and government agencies worldwide. Larscom's headquarters are at 1845 McCandless Drive, Milpitas, California 95035. Additional information can be found at www.larscom.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.

Larscom is a trademark of Larscom Incorporated. All other trademarks mentioned herein are the property of their respective owners. Any forward-looking statements in this news release are based on our current expectations and beliefs and are subject to known and unknown risks and uncertainties that could cause the actual results to differ materially from those suggested. Factors that could cause actual results to differ materially include (but are not limited to) customer concentration that includes WorldCom, the effect of the general downturn in the telecommunications equipment industry, the ability to develop successful new products, competition, dependence on recently introduced new products and products under development, market acceptance of new products and the standards upon which they are based, the acquisition of businesses or technologies, dependence on component availability from key suppliers, rapid technological change and fluctuations in quarterly operating results, as well as additional risk factors as discussed in the "Risk Factors" section of our annual report on Form 10-K and quarterly reports on Form 10-Q filed with the U.S. Securities and Exchange Commission. These forward-looking statements represent our judgment as of the date of this news release. We disclaim, however, any intent or obligation to update these forward-looking statements.