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Press Release

CIENA Provides Enron Communications With DWDM Equipment in New Nationwide Network Build; Enron, CIENA and Cisco Create First High-Speed, IP-Only Backbone Network

FOR IMMEDIATE RELEASE: November 3, 1998

LINTHICUM, Md.--BUSINESS WIRE----CIENA Corporation (Nasdaq: CIEN) today announced that Enron Communications, Inc. (NYSE:ENE) has chosen CIENA's Multiwave¨ Sentry 4000 dense wavelength division multiplexing (DWDM) equipment for immediate deployment in Enron's new Pure Internet Protocolsm(IP) backbone network. CIENA already has shipped equipment for Enron Communications' Portland-to-Los Angeles fiber route valued at approximately $23 million.

"By directly connecting to our Cisco 12000 GSRs, CIENA's equipment made it possible for Enron Communications to create a network architecture that is elegantly simple yet hugely powerful with tremendous bandwidth capacity. No SONET, no ATM, and no Frame Relay components - just pure IP over DWDM fiber," said Stan Hanks, vice president of research and technology, Enron Communications, Inc. "As compared to previously deployed data-centric architectures, this approach eliminates intermediate protocols, simplifies the architecture, lowers costs, increases reliability and reduces errors, ultimately differentiating Enron Communications and enabling us to offer our customers better service."

"This kind of deployment validates our conception of the New Network Architecture," said Scott Clavenna, senior analyst, Pioneer Consulting, "which combines the technological benefits of DWDM with cost efficiencies of IP to create a flexible, scalable broadband network."

"Enron Communications is the first carrier to truly create an IP-to-the-glass via DWDM architecture on a network-wide basis and is poised to reap the rewards," said Patrick Nettles, CIENA's president and chief executive officer. "This deployment illustrates that CIENA's DirectConnect technology can be integral in creating a simplified network with massive capacity. Continued deployment of CIENA's MultiWave¨ DWDM systems will make it possible for Enron Communications' to keep pace with burgeoning traffic demands, offer its customers fast, reliable Internet backbone service, and hold down the cost of bandwidth."

In its present configuration, Enron Communications Pure IPsm network will transport data at speeds of 2.4 Gbps (OC48) on each DWDM channel. Enron Communications' will deploy this backbone through use of CIENA MultiWave¨ Sentry's DirectConnect functionality in conjunction with deployment of Cisco Systems 12000 series Gigabit Switch Routers (GSRs). The Cisco 12000 will interface directly into CIENA's DWDM system interfaces at 2.4 Gbps, without the need for additional intermediate network elements such as SONET terminal multiplexers.

Note to Investors

Forward-looking statements in this release, including those implying network-wide deployment of CIENA DWDM equipment, 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 by 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 Quarterly Report on Form 10-Q, as filed with the Securities and Exchange Commission on September 14, 1998.

About Ciena

Based in Linthicum, Maryland, CIENA Corporation is a worldwide market leader of open architecture, dense wavelength division multiplexing (DWDM) systems for long-distance and local exchange carriers. CIENA's DWDM solutions include the MultiWave¨ 1600 long-haul transport system, WaveWatcher¨ network management software, the MultiWave Optical Add/Drop Multiplexer, the MultiWave SentryTM enhanced long-distance transport system and the new MultiWave¨ Firefly and MultiWave MetroTM short-haul systems. Through its Alta subsidiary, based in Norcross, GA, CIENA provides a range of engineering, furnishing and installation (EF&I;) services for telecommunications service providers in the areas of transport, switching and wireless communications.

Additional information about CIENA can be found on its World Wide Website: http://www.ciena.com.

About Enron

Enron Communications is building long-haul fiber-optic networks on strategic routes throughout the United States in an effort to create a data-centric national fiber optic backbone. Enron Communications will focus on the wholesale bandwidth needs of the telecommunications service providers. Enron Corp is one of the world's leading integrated natural gas and electricity companies. The company, which owns approximately $28 billion in assets, produces electricity and natural gas, develops, constructs and operates energy and water facilities worldwide and delivers physical commodities and risk management and financial services to customers around the world. Enron's internet address is http://www.enron.com, the stock is traded under the ticker symbol, "ENE."

For additional information please contact:

CIENA Corporation Press Contacts: Denny Bilter

800/921-1144 email: dbilter@ciena.com

Enron Communications, Inc. Tracy Smith

503/703-7034 email: tracy_smith@enron.net

CIENA Corporation Investor Contact: Suzanne DuLong

888/243-6223 email: ir@CIENA.com







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