CIENA’S COREDIRECTOR™ OPTICAL NETWORKING SOLUTION COMPLETES TELCORDIA ™ OSMINE SERVICES PROCESS

Industry-Leading Core Switching Platform Ready for US-based ILEC Networks

Linthicum, MD — 02/26/2003

Ciena Corporation® (NASDAQ: CIEN), a leading provider of intelligent optical networking systems and software, today announced that release 2.1.1 of its CoreDirector™ core switching product has completed the Telcordia™ OSMINE Services process for the Telcordia™ TIRKS®, NMA® and Transport Element Activation Manager systems.

Completion of this process helps enable CoreDirector’s seamless operation with service providers that have deployed these Telcordia OSSs, such as the U.S.-based incumbent local exchange carriers (ILECs).

“The completion of OSMINE satisfies our customers’ expectations for interoperability with the Telcordia OSSs. This milestone for CoreDirector can only increase our ability to offer solutions that the world’s largest carriers require to serve their customers,” said Pamela Adams, senior vice president, core networking group for Ciena.

The completion of the Telcordia™ OSMINE Services process will help enable carriers to integrate Ciena’s industry-leading core switching solutions into their existing networks and operations environments to rapidly meet the growing demand for increased flexibility, intelligence and efficiency.

“The Telcordia OSMINE Services process is a rigorous, thorough testing for products attracting major carriers,” said Dennis Tinley, vice president, Customer Solutions, Telcordia Technologies, Inc. “Completion of this process will enable Ciena to further establish its CoreDirector product with potential customers. ”

NOTE ABOUT OSMINE: Products that have been through the OSMINE process have greater marketability and salability to U.S.-based incumbent local exchange carriers (ILECs). The process also helps ensure that the product will integrate with the embedded OSS systems when a product is deployed. Thus, the ILECs will have automation or flowthrough support. In addition, the equipment manufacturer can have multiple product lines or network elements that are OSMINE Services supported. At Telcordia, the equipment manufacturer can also be assured that all products and features are kept confidential.


About Ciena

Ciena Corporation’s market-leading intelligent optical networking systems form the core for the new era of networks and services worldwide. Ciena’s LightWorks™ architecture enables next-generation optical services and changes the fundamental economics of service-provider networks by simplifying the network and reducing operating costs. Additional information about Ciena can be found at www.Ciena.com.
Note to Investors

This press release contains certain forward-looking statements based on current expectations, forecasts and assumptions of Ciena (the Company) that involve risks and uncertainties. Forward-looking statements in this release, including, but not limited to, the cost savings, deployment timing and network management benefits of the Company’s products, are based on information available to the Company as of the date hereof. The Company’s actual results could differ materially from those stated or implied in such forward-looking statements, due to risks and uncertainties associated with the Company’s business, which include the risk factors disclosed in the Company’s Report on Form 10-Q filed with the Securities and Exchange Commission on February 20, 2003. Forward-looking statements include statements regarding the Company’s expectations, beliefs, intentions or strategies regarding the future and can be identified by forward-looking words such as “anticipate,” “believe,” “could,” “estimate,” “expect,” “intend,” “may,” “should,” “will,” and “would” or similar words. The Company assumes no obligation to update the information included in this press release, whether as a result of new information, future events or otherwise.

Press Contacts:
Nicole Anderson
Ciena Corporation
(877) 857 -7377
pr@ciena.com
Investor Contacts:
Marie Downing
Ciena Corporation
(888) 243-6223
ir@ciena.com