Centillium Communications, Inc.

Laurie Falconer

Centillium Communications, Inc.

(510) 771-3647

[email protected]

CENTILLIUM COMMUNICATIONS INTEGRATES COPPER MOUNTAIN NETWORKS' TECHNOLOGY AND JOINS NEW COPPERSILICON INITIATIVEú

Centillium Communications Included in Program to Integrate Copper Mountain's Technology into its Industry Leading Chipsets to Support Voice Over DSL

FREMONT, Calif., August 21, 2000 - Centillium Communications, Inc. (Nasdaq: CTLM), innovator of broadband communications technology, today announced an expansion of its relationship with Copper Mountain Networks, Inc. (Nasdaq: CMTN) to include participation in Copper Mountain's CopperSilicon Initiative. Centillium will incorporate Copper Mountain's intellectual property into its next-generation Customer Premise Equipment (CPE) and Central Office (CO) chipsets to ensure full interoperability of Centillium-based CPE with Copper Mountain's family of DSL concentrators.

Centillium Communications and Copper Mountain Networks have been partners for over a year in marketing DSL equipment. Copper Mountain currently utilizes Centillium's innovative chipsets in line cards for its widely deployed family of DSL concentrators, which support full rate, Turbo G.lite, and G.lite ADSL services. Via the CopperSilicon Initiative, Centillium and Copper Mountain will collaborate on development of equipment supporting the VoDSL service market.

"Centillium has worked closely with Copper Mountain in fulfilling the growing needs for innovative, next generation chipsets and we are pleased to be a part of the CopperSilicon Initiative," said Faraj Aalaei, CEO and co-founder, Centillium Communications. "The combination of the Copper Mountain intellectual property with Centillium's innovative broadband communications solutions is unbeatable in the market."

"We are very pleased that Centillium and Copper Mountain are expanding our relationship. By incorporating Copper Mountain technology into its next-generation VoDSL chipsets, Centillium will ensure that these chipsets are interoperable with Copper Mountain central office equipment," said Rick Gilbert, Copper Mountain's president and CEO. "Centillium's VoDSL chipsets are helping to make VoDSL technology even more affordable to service providers and their business customers."

About Centillium Communications

Centillium Communications, Inc. is combining technical innovation and customer commitment to make broadband communications a mass-market reality. Centillium consistently delivers value to its customers by providing broadband networking systems for applications across all market segments. The company designs and markets communications chipset solutions for central office equipment, DLC line cards, and customer premise equipment for Digital Subscriber Line (DSL), home networking and Voice-over-Packet. Centillium Communications, Inc. is located at 47211 Lakeview Blvd., Fremont, CA 94538. Additional information is available at www.centillium.com

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Forward Looking Statements

Except for historical information contained in this press release, the foregoing contains forward-looking statements that involve risks and uncertainties. Actual results may differ materially from those indicated by such forward-looking statements based on a variety of risks and uncertainties. Information about potential factors that could affect Centillium's financial results is included in Centillium's prospectus and will be included in Centillium's Annual Report on Form 10-K and Quarterly Reports on Form 10-Q, which will be filed with the Securities and Exchange Commission.