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Centillium Communications to Enable Industry's First


Symmetrical DSL Chipsets for Japan

Business Editors/High-Tech Writers

FREMONT, Calif.--(BUSINESS WIRE)--Sept. 5, 2000--

Sumitomo Electric Industries to Deploy Central Office and

Customer Premises Equipment Based on Centillium's G.dmt Annex H

CopperFlite DSL Chipsets

Demonstrating continued leadership in broadband communications technology for Japan, Centillium Communications, Inc. (Nasdaq:CTLM) announced today availability of software to enable CopperFlite Central Office (CO), CopperFlite Utopia, and Flite Optimizer Customer Premise Equipment (CPE) chipsets to comply with the G.dmt (G.992.1) Annex H standard for Synchronized Symmetrical Digital Subscriber Line (SSDSL). Now Japanese businesses and residential users can utilize SSDSL for high-speed access to the Internet and corporate networks reaping the full benefits of broadband technology.

Sumitomo Electric Industries, the leading DSL equipment vendor in the Japanese market, introduced Japan's first residential Asymmetrical DSL (ADSL) equipment based on Centillium chipsets in 1999 and will manufacture Annex H SSDSL CO equipment and CPE utilizing Centillium's CopperFlite Octal CO chipset and CPE utilizing CopperFlite Utopia CPE chipset.

The ITU G.dmt Annex H specification is the standard allowing symmetric DSL to coexist with TCM-ISDN within the same bundle, addressing the unique requirements of Japanese copper loop plants. Centillium's Annex H implementation can achieve data rates well over 3 Mbps for SSDSL, exceeding the requirement of 1.6 Mbps. Japan has one of the largest installed bases of ISDN in the world with more than seven million ISDN subscribers.

"Centillium's technology leadership in developing DSL chipsets which address the special needs of the Japanese market has been unmatched," said Mr. Yoshikazu Nishiwaki, general manager of Sales & Marketing, Sumitomo Electric Industries. "By using Centillium's highly integrated low power products for Annex C ADSL and Annex H SSDSL, we are able to offer a complete suite of high performance products for both residential and business markets in Japan."

Centillium's G.dmt Annex H Chipsets

Centillium's CopperFlite CO chipset is a fully programmable DSL transceiver. Each port consumes less than 1/2 a watt of power and occupies about one square inch of total board space. CopperFlite uses just two chips to deliver the integrated silicon and software needed for a low-power, high-density 8-port SSDSL transceiver.

Centillium's CopperFlite Utopia and Flite Optimizer chipsets each deliver a complete CPE transceiver with just two chips, significantly reducing the form factor, power-usage, component count, and BOM costs normally associated with broadband access devices. The CopperFlite Utopia chipset interfaces with Ethernet for such products as routers and gateways. The Flite Optimizer chipset supports USB, PCI, Mini-PCI, and CardBUS interfaces for PC Centric solutions.

In addition to support for Annex H, Centillium CopperFlite and Flite Optimizer chipsets conform to a wide range of international DSL standards, including Turbo G.lite, G.lite (ITU-T G.992.2) Annex A and C, and G.dmt (ITU-T G.992.1) Annex A, B, and C.

Centillium's CopperLite chipset, which has been shipping to network equipment makers since early 1999, is the only ADSL Annex C solution that has been actively deployed by NTT and CLECs in Japan.

About Sumitomo Electric Industries

Sumitomo Electric Industries (SEI), a total solutions provider in broadband networking, offers cost-effective high quality DSL products for Central Offices (CO), Customer Premises and MDU/MTU. As a market pioneer of G.lite/G.dmt, SEI has delivered "MegaBit Gear" DSLAM and CPE for actual field deployment by major carriers in Japan and Asia. In addition to products for the carrier DSL market, SEI has shipped tens of thousands of ADSL products for campus networks based on legacy Ethernet LAN. Along with DSL, SEI's wide product lineup ranges from ultra high-quality fiber optic cable to high-performance network equipment such as ATM Switches, ATM Routers, Layer 3 LAN Switches with Gigabit Ethernet, FDDI or ATM uplink, and Network Management Systems. For further information, please visit http://www.sei.co.jp (about DSL) http://www.megabitgear.com.

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.

Statements Looking Forward

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. 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.

Note to Editors: CopperFlite is a trademark of Centillium Communications, Inc. All other products or service names mentioned herein are the property of their respective owners.

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