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Tina Tan
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ttan@marketready.com

CALIENT Technologies and Tellabs Achieve Successful
All-optical Network Interoperability

San Jose, California, December 6, 2000 – CALIENT Technologies, an innovator of intelligent, all-photonic switching systems, today announced successful interoperability between CALIENT's DiamondWave™ photonic switch and Tellabs' TITAN® 6100 optical transport system. The announcement marks a milestone in a series of interoperability tests, which are a part of CALIENT's Optical Platform Peering Program (OP3).

"Interoperability with Tellabs' TITAN 6100 system is an early indicator that CALIENT's DiamondWave photonic switch will be a successful solution in metro applications," said Charles Corbalis, CALIENT president and CEO. "For the rapidly-growing metro carrier market, it is essential to incorporate photonic switching to enable applications like wavelength provisioning, SONET integration and optical add/drop. The combination of the DiamondWave switch and the TITAN 6100 meets the customer need for dynamic bandwidth management in a ring environment while leveraging the economic benefit that only a photonic infrastructure can provide."

CALIENT recently established the multi-vendor OP3 initiative to test its DiamondWave™ 256 switch with emerging network elements in two-layer photonic network environments. Three distinct phases of testing in various legacy, IP service, metro and long-haul applications are being implemented. Proven interoperability with top-tier players such as Tellabs helps to reinforce CALIENT's goal of promoting best-of-breed options for service providers.

"This demonstrates Tellabs' ongoing commitment to multi-vendor interoperability," said Robert Pullen, vice president and general manager for Tellabs' Optical Networking Group. "Bringing these two best-in-class products together creates a first-to-market solution for dynamic mesh optical networks."

About CALIENT Technologies

CALIENT Technologies is a new developer of intelligent, all-photonic switching systems and software that help service providers scale their networks for explosive bandwidth demands and deliver a new generation of wavelength services. CALIENT's architecture and DiamondWave™ switching system will provide a seamless, ‘opto-electronic-to-photonic' migration path that is non-disruptive to legacy operations, and near-term opportunity for carriers to offer revenue-generating optical services from their photonic infrastructure. Founded in March 1999, the company is headquartered in San Jose, California. For additional information about CALIENT, visit www.calient.net.

About Tellabs

Tellabs designs, manufactures markets and services, optical networking, next-generation switching and broadband access solutions. These solutions are supported by the company's professional services. The company's products are used worldwide by providers of communications services. Tellabs stock is listed on the Nasdaq Stock Market (TLAB).

Tellabs, the Tellabs logo and TITAN are registered trademarks of Tellabs in the United States and/or countries.