Laurie Falconer Centillium Communications, Inc. (510) 771-3647 [email protected]

ONCE AGAIN CENTILLIUM SMASHES DENSITY AND POWER BARRIER WITH MOST ADVANCED OCTAL ADSL CHIPSET

CopperFlite Central Office Chipset Supports Eight Full Rate/G.lite ADSL Ports While Minimizing Power, Space, and Cost for Network Access Line Cards

FREMONT, Calif., June 28, 2000 - Centillium Communications, Inc. (Nasdaq:CTLM), innovator of broadband communications technology, has doubled Asymmetric Digital Subscriber Line (ADSL) port density with the introduction of the octal-port CopperFlite, a Full-Rate/G.lite ADSL transceiver chipset. Each port consumes less than ¸ a watt of power and occupies about one square inch of total board space. This solution enables network system vendors to design and build very small, low-power, low-cost network access line cards for upgrading copper infrastructure to handle broadband communications with Quality of Service (QoS) support.

The octal-port CopperFlite chipset is fully pin-to-pin and software compatible with Centillium's quad-port CopperFlite solution and octal-port CopperLiteú solution. Each port can be individually configured to support either Full-Rate, Turbo G.lite, or G.lite ADSL industry standards, including ITU G.992.1 (Annex A, B, C, and H); ITU G.992.2 (Annex A and C); or ANSI T1.413 Issue 2. The octal-port CopperFlite supports multiple Permanent Virtual Circuits (PVCs) for voice-over-DSL (VoDSL) applications with QoS support and voice-over-Pulse Code Modulation (VoPCM) for transporting uncompressed toll-quality voice in conjunction with Asynchronous Transfer Mode (ATM) traffic. As a result, Internet Service Providers (ISPs) and data carriers can increase revenues by offering customers combined data and voice services.

"The DSL market is growing fast, and service providers are looking for flexible DSL solutions that deliver multiple options for meeting the needs of diverse subscriber groups, which include both business and residential customers," said Pat Hurley, DSL Analyst, TeleChoice. "Solutions which can offer multiple "flavors" of DSL, voice support and high port density will help service providers rapidly deploy their DSL networks and meet end-user demands."

CopperFlite dramatically reduces the cost and footprint of line cards with industry leading silicon integration. The octal-port CopperFlite is a two-chip solution and requires no external memory, Voltage Control Crystal Oscillators (VCXO), or glue logic. This significantly reduces the total Bill of Material (BOM) cost, board real estate, and manufacturing cost. Not needing external common program memory removes a single point of failure in the line card increasing the overall reliability of the equipment. Centillium's programmable Digital Signal Processing (DSP) technology ensures future-proof line cards that can be easily upgraded with software only.

"The ability to support high density and low power consumption is an absolute prerequisite for Digital Subscriber Line Access Multiplexers (DSLAMs) and Digital Loop Carrier (DLC) vendors to be competitive," said Al Gharakhanian, director of marketing for network access products. "The new octal-port CopperFlite is the ideal solution for meeting these customer requirements."

Centillium Octal Port CopperFlite CO Chipset Solution Centillium's octal-port CopperFlite chipset (CT-L53SC08) is the industry's highest performance, most flexible, and lowest power-dissipating ADSL solution for CO equipment. In Full-Rate ADSL, CopperFlite enables end users to connect to the Internet at speeds up to 8 Mbps downstream and up to 1 Mbps upstream, depending on the loop and reach conditions. In G.lite ADSL, CopperFlite supports connection rates up to 1.5 Mbps downstream and up to 512 kbps upstream, complying with G.992.2 standards. Interoperability with both Full-Rate and G.lite customer premises equipment has been verified in multi-vendor environments.

The octal-port CopperFlite consists of two chips, the CopperFlite analog front end (CT-L53AC08) and the CopperFlite digital signal processor (CT-L53DC08). This solution offers a complete suite of silicon and software features, including Utopia Level-2, bit synch, and PCM interfaces for DSLAM, DLC, Multi-Dwelling Unit (MDU), and ONU applications.

Availability
The Centillium CopperFlite CO chipset is available for sampling in July. Full-scale production is expected to commence in third quarter of this year. The CopperFlite digital chip is available in a 304-pin super ball grid array (SBGA), while the CopperFlite analog chip is available in a 128-pin metric quad flat pack (MQFP).

About Centillium Communications
Centillium Communications, Inc. is combining technical innovation and customer commitment to make broadband communications a 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, digital loop carrier (DLC) line cards, and customer premise equipment for Digital Subscriber Line (DSL), Voice over Packet (VoP) and Premise Networking. The Centillium Communications headquarters are located at 47211 Lakeview Blvd., Fremont, CA 94538. Additional information is available at www.centillium.com.

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, including the risks and uncertainties relating to actual quantities and timing of any orders received under the contract and the successful development and market acceptance of Centillium's new products. The company assumes no obligation to update these forward-looking statements to reflect events or circumstances after the date hereof. Information about potential factors that could affect Centillium's financial results is included in Centillium's Annual Report on Form 10-K and most recent Quarterly Report on Form 10-Q, available for viewing on the Securities and Exchange Commission's website at www.sec.gov.

Centillium Communications and the Centillium logo are trademarks of Centillium Communications.

Copyright 2003 Centillium Communications, Inc. All rights reserved. All other products or service names mentioned herein are the property of their respective owners.