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


Full-Rate ADSL Modems Using Centillium Chipsets Score Throughput Rate Higher than 6 Mbps, Significantly Higher than Industry Average

FREMONT, Calif., August 23, 2000 - Centillium Communications, Inc. (Nasdaq: CTLM), innovator of broadband communications technology, today announced the results of independent third party testing which demonstrated that its Flite Optimizer USB chipsets, with a throughput rate higher than 6 Mbps, is nearly double the industry average -- 3 to 4 Mbps. The testing compared full-rate ADSL USB modems utilizing chipsets from top tier ADSL chipset makers and concluded that, among those tested, modems using Centillium's Flite Optimizer USB chipsets are the fastest available today.

These test results were based on Layer 4 throughput rates rather than the more-typically quoted Layer 1 payload rates. The difference is significant, since Layer 4 testing gives a more accurate indication of performance from the end user's perspective than Layer 1 testing. Layer 4 throughput measures the actual usable data transmitted from end to end. Layer 1 payload, on the other hand, is a measure of the capacity of the link and does not consider overhead and bottlenecks present in the higher protocol layers.

"Layer 1 throughput rates are less relevant to the end user because they don't give a true indication of the actual speed for applications they use," said Pat Hurley, DSL Analyst, TeleChoice. "One of the most common examples of this is the standard 56 kbps modem. Consumers typically net only 28-33 kbps performance from 56k modems. End users should feel confident when a modem says it can deliver at speeds of 6 Mbps that it can deliver a full 6 Mbps. Layer 4 testing provides that assurance and represents a significant advancement in the evaluation of modem performance."

Independent Testing
NSTL performed comparison testing on Full Rate ADSL USB modems, utilizing Centillium's Optimizer chipset, as well as modems based on other Full Rate ADSL USB chipset providers. NSTL made use of a commercially available File Transfer Protocol (FTP) client to generate traffic and measure the throughput. The test setup was based on commercially available equipment commonly used in ADSL deployments. The test report can be accessed via the web at

About NSTL
NSTL, a division of CMP Media, was established in 1983 as the world's first independent organization dedicated exclusively to testing the functionality, usability and performance of hardware and software. Its suburban Philadelphia facility has 16 laboratories and a staff of highly skilled test engineers. In addition to its U.S. facility, NSTL has labs in Canada, Taiwan, Singapore, Japan, China, Israel, and the UK. Its clients include IBM, Microsoft, Intel, Canon, Casio, Compaq, Dell and HP. NSTL's Web site is

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

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

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.

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