Ciena to Support Adelphia Multi-Service Networks in California, Colorado, Connecticut, Florida and Ohio

New and Expanded Deployments are Delivering Video on Demand, High-Speed Data and Commercial Services Using VirtualWire VLAN Switching of the New CN 4350

Linthicum, MD —

Ciena® Corporation (Nasdaq: CIEN), the network specialist, today announced that Adelphia Communications Corporation (OTC: ADELQ) has deployed Ciena optical Ethernet platforms in multiple cable systems across the country to deliver video on demand (VOD), high-speed data and commercial services to Adelphia customers. Adelphia is the fifth-largest cable television company in the United States and serves customers in 31 states and Puerto Rico.

Adelphia first deployed Ciena equipment in its Los Angeles network in November 2003 with the initial roll-out of VOD in that market. Today’s announcement represents a significant expansion of that relationship along with new installations at other major Adelphia cable systems, including those in and around Cleveland, Colorado Springs, Colo., Waterbury, Conn., and West Palm Beach, Fla.

“These deployments emphasize our continued commitment to building next-generation networks to deliver a suite of advanced services to our customers nationwide,” said Harold Willison, director, high-speed data transport, design and engineering for Adelphia. “Ciena helped us successfully converge our L.A. network to deliver advanced services while reducing our overall costs and simplifying our network operations, and now we’re replicating that success in our other systems.”

Adelphia has deployed a variety of equipment from Ciena to converge, transport and deliver the multiple services over its broadband networks, including the new CN 4350 Ethernet Services Provisioning Switch; the CN 2100 Passive Optical Multiplexer; and the CN 2200 Managed Optical Ethernet Multiplexer.

“Adelphia is quickly becoming a signature cable customer for us as their rapid roll-outs across the country demonstrate our competitive advantage – carrier-grade, multi-service transport and switching platforms that are extremely simple to deploy and manage,” said Jim Collier, senior vice president of worldwide sales, Ciena. “Even more importantly, Adelphia was the first to deploy our new CN 4350 featuring VirtualWire VLAN switching, and they are already seeing the significant equipment and operational savings by leveraging our transport and switching platforms at the edge of the network and centralizing routing at their major headends.”

Ciena is the leader in optical Ethernet switching and transport for cable networks based on multi-system and operator-wide deployments with cable operators such as Adelphia Communications, ARMSTRONG Cable, Buckeye CableSystem, Cablevision, Cox Communications, and others. Ciena products are the backbone of networks passing more than 15 million homes.


About Ciena

Ciena specializes in network transition. We provide the flexible platforms, intelligent software and professional services to build converged networks for enhanced services and applications. With a growing global presence, Ciena leverages its heritage of practical innovation to deliver maximum performance and economic value in communications networks worldwide. For more information, visit www.ciena.com.
Note to Investors

This press release contains certain forward-looking statements based on current expectations, forecasts and assumptions that involve risks and uncertainties. These statements are based on information available to the Company as of the date hereof; and Ciena’s actual results could differ materially from those stated or implied, due to risks and uncertainties associated with its business, which include the risk factors disclosed in its Report on Form 10-K, which Ciena filed with the Securities and Exchange Commission on December 9, 2004. Forward-looking statements include statements regarding Ciena’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. Ciena 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