3Com and Copper Mountain Announce End-to-End, Interoperable G.lite Solutions.

RESTON, Va.--(BUSINESS WIRE)--Sept. 27, 1999--

Strategic Alliance to Promote DSL Adoption Expands Beyond

Business Customers to Target Residential Customers with

Line of G.lite Products

3Com Corporation (Nasdaq:COMS) and Copper Mountain Networks, Inc., (Nasdaq:CMTN) today announced both companies have expanded their strategic alliance, aimed at promoting DSL adoption by business customers, to deliver G.lite solutions to a broader market consisting of telecommuters, small office/home office (SOHO) users, and residential customers.

To accelerate deployment of this high-speed, always-on technology to the home market, 3Com and Copper Mountain have developed interoperable G.lite customer premise equipment (CPE) and G.lite DSL concentrator solutions compatible with the recently ratified International Telecommunication Union (ITU) G.lite standard. 3Com will provide a number of G.lite CPE products that support G.lite as well as G.dmt standards, which will give end users more choices in setting up their wide area network connections. (1)Copper Mountain has developed a G.lite line card that plugs into existing CopperEdge(r) DSL concentrators and can be operated concurrently with Symmetric DSL (SDSL) and ISDN DSL (IDSL) line cards in the same chassis, enabling carriers to use one platform to provide both business and residential DSL services.

On the CPE side, 3Com's growing portfolio of G.lite and G.dmt products include the HomeConnect(tm) DSL modem PCI and the HomeConnect ADSL modem Ethernet. The space-saving HomeConnect ADSL modem PCI resides inside the home user's computer and requires no desktop space. The HomeConnect ADSL modem Ethernet connects any PC, Macintosh, or UNIX workstation with an Ethernet network interface card (NIC), or it can be connected to a hub or switch to provide multiple users with the benefits of high-speed ADSL access.

"3Com and Copper Mountain have forged a powerful strategic alliance to propel DSL into the consumer marketplace, which is the next frontier for DSL expansion," said Jerry Devlin, vice president and general manager of 3Com's personal communications division. "G.lite will be attractive to consumers because of its low-cost CPE, ease of installation, and delivery of POTS (Plain Old Telephone Service) voice and data on the same line, while carriers can benefit from G.lite's low power consumption and high port densities in the central office."

"3Com is one of our premier allies in developing companion DSL CPE equipment," said Rick Gilbert, president and CEO of Copper Mountain Networks. "3Com has the brand recognition and distribution strength to help us reach our mutual goal of ubiquitous availability of affordable, easy-to-use G.lite DSL solutions for the mass marketplace."

About 3Com Corporation

With approximately 300 million customers worldwide, 3Com Corporation connects more people to information in more ways than any other networking company. 3Com delivers innovative information access products and network system solutions to enterprises, small businesses, carriers and network service providers, PC OEMs and consumers. 3Com-More connected.(tm) For further information, visit 3Com's World Wide Web site at www.3com.com or the press site at www.3com.com/pressbox.

About Copper Mountain Networks

Copper Mountain Networks, Inc., (Nasdaq:CMTN) develops and markets a comprehensive family of DSL solutions that enable high-speed internetworking over existing copper facilities. The company's mission is to enable carriers and other service providers to offer a full range of high-performance, cost-effective data and voice services over DSL that are easy to deploy, use, and manage. Copper Mountain's CopperRocket(tm) CPE family addresses the bandwidth, reliability, ease-of-use, and cost concerns of remote offices and users. Its carrier-class CopperEdge(r) DSL concentrators and CopperView(tm) network management solutions offer a robust and scalable platform for carriers and multi-tenant unit service providers to generate a high return on investment while satisfying the ever-increasing user demand for bandwidth. Customers wanting more information about Copper Mountain products can contact Diana Helfrich at 650/687-3314, or visit the Company's World Wide Web site at http://www.coppermountain.com. For investor relations information, call toll free 877-INFO-CMTN (463-6268) or contact us at [e-mail].

(1) Please see the Copper Mountain press release also announced today entitled, "Copper Mountain Introduces High Port Density G.lite Line Card for Its CopperEdge(r) Family of DSL Concentrators." Copper Mountain is unveiling its G.lite DSL line card at Booth No. 200 at the DSLCon'99 Fall Conference and Exhibition, being held at the Hyatt Regency Hotel in Reston, Virginia, from Sept. 27 through Sept. 29.

This news release contains certain forward-looking statements that involve risks and uncertainties. Such statements are only predictions, and Copper Mountain's actual results may differ materially from those anticipated in these forward-looking statements. Factors that may cause such differences include, but are not limited to, risks related to product development, our ability to keep pace with rapidly changing product requirements, market acceptance of our products, and our ability to meet product development and delivery schedules. These factors and others are more fully discussed under "Risk Factors" and elsewhere in Copper Mountain's Registration Statement on Form S-1 (No. 333-73153), as filed with the Securities and Exchange Commission.

Note to Editors: Copper Mountain and all Copper Mountain product names are trademarks of Copper Mountain Networks, Inc. 3Com is a registered trademark, and HomeConnect and More connected are trademarks of 3Com Corporation. All other trademarks and trade names belong to their respective holders.