Copper Mountain's Industry-Leading MTU DSL Concentrators Support Quantum Bridge's Optical Access Solution.

Business Editors/High-Tech Writers

PALO ALTO, Calif.--(BUSINESS WIRE)--Nov. 7, 2000

Interoperability Between Copper Mountain's MTU Concentrators and

Quantum Bridge's Optical Access System Enables Providers to

Cost-Effectively Leverage Last-Mile Copper With First-Mile Fiber for

High-Bandwidth In-Building Service

Copper Mountain Networks, Inc. (Nasdaq:CMTN), a leading provider of Digital Subscriber Line (DSL) solutions for business and residential users, and Quantum Bridge(TM) Communications, Inc., a leading provider of optical access systems, today announced that Copper Mountain's DSL concentrators interoperate with Quantum Bridge's optical access solutions, enabling multi-tenant unit (MTU) DSL broadband providers to better leverage "first-mile" public network fiber-optic infrastructure with "last-mile" in-building copper telephone wiring.

The Quantum Bridge/Copper Mountain copper-to-fiber solution integrates Copper Mountain's CopperEdge(R) and OnPrem(TM) DSL concentrators with Quantum Bridge's QB5000 Optical Access Switch (OAS) and QB100 Intelligent Optical Terminal (IOT) to enable providers to cost-effectively provision, scale and manage concurrent in-building voice and data services over existing copper wiring and cost-efficiently backhaul multiple MTU DSL subscribers' traffic over fiber-optic cable.

"Quantum Bridge's advanced optical access solution makes fiber backhaul more affordable for MTU DSL service providers," said George Marshall, vice president of marketing for Copper Mountain's MTU Business Unit. "With Copper Mountain's CopperEdge and OnPrem DSL concentrators and Quantum Bridge's Optical Access System, MTU providers can deliver cost-effective high-speed DSL broadband services over existing copper wiring and cost-effectively backhaul traffic over high-bandwidth fiber."

"We are pleased to partner with Copper Mountain to deliver a cost-efficient, copper-to-fiber solution to MTU DSL service providers," said Jeff Gwynne, founder and senior vice president of marketing at Quantum Bridge Communications. "Copper Mountain's CopperEdge and OnPrem DSL concentrators boost the cost efficiency of broadband service over a building's installed copper infrastructure, and Quantum Bridge's optical access solutions boost the cost efficiency of fiber backhaul. It's a hand-in-glove fit that enables MTU service providers to achieve cost efficiencies end to end."

About the Interoperable Quantum Bridge/Copper Mountain Copper-to-Fiber MTU Solution

Equipped with IP IQ(TM), Copper Mountain's Internet Protocol service intelligence, Copper Mountain's DSL concentrators aggregate voice and data traffic from multiple subscribers onto shared network paths or "virtual circuits," enabling MTU broadband providers to cost-effectively provision and scale DSL services over buildings' existing copper wiring. Quantum Bridge's optical-access technology can enable DSL broadband providers who standardize on Copper Mountain concentrators to cost-effectively backhaul voice and data traffic from MTUs over high-bandwidth fiber-optic cable by enabling them to "slice" wavelengths and divide fiber capacity among different customers with varying bandwidth requirements.

With the interoperable Quantum Bridge/Copper Mountain copper-to-fiber solution, MTU service providers can deploy a Copper Mountain CopperEdge or OnPrem DSL concentrator to deliver high-value voice and data services to subscribers over a building's installed base of "last mile" copper wiring. The concentrator can pass off subscribers' voice and data traffic to a Quantum Bridge QB100 Intelligent Optical Terminal (IOT), which can be deployed alongside it in building wiring closets. The QB100 IOT, which supports variable customized backhaul speeds, can send the traffic across a "first-mile" Passive Optical Network to a QB5000 Optical Access Switch (OAS). Located in a service provider's network operations center, the QB5000 OAS can aggregate traffic from hundreds of QB100 IOTs and forward it to a wide area network.

About Copper Mountain's MTU DSL Solutions

Copper Mountain offers a range of solutions for MTU DSL service providers, including:

-- The CopperEdge(R) 200 DSL Concentrator, a NEBS-3, carrier-class concentrator
which scales to 192 ports for central offices or large MTU installations;

-- The CopperEdge(R) 150 DSL Concentrator, which has a compact form factor and
lower cost structure, is available with 24 or 48 ports, and is ideal for
medium-sized MTU buildings; and

-- The OnPrem(TM) 2400 DSL Concentrator, which is available with 8, 16, and 24
ports and combines an integrated, high-performance solution with a compact,
low-cost chassis purpose built for small-sized buildings.

About Quantum Bridge Communications

Quantum Bridge Communications, headquartered in Andover, Mass., is a leading provider of optical access systems designed to address the bandwidth bottlenecks in today's access networks. The Quantum Bridge Optical Access System has been designed to meet the stringent network requirements of service providers. For more information, please visit the company's Web site at www.quantumbridge.com.

About Copper Mountain Networks

Copper Mountain Networks, Inc. (Nasdaq:CMTN) manufactures DSL equipment for central office, digital loop and multi-tenant unit (MTU) broadband networks worldwide. Its DSL solutions enable carriers and service providers to deliver cost-effective, high-performance data and voice services over existing copper telephone wiring. Its CopperEdge(R) 200 DSL Concentrator is deployed in some of the world's largest public networks, and its environmentally hardened CopperEdge(R) RT (remote terminal) DSL Concentrator extends the reach of DSL to the millions of customers served by digital loop carriers (DLCs). Copper Mountain's OnPrem(TM) MTU Concentrator offers a cost-effective and scalable platform for MTU service providers. With IP IQ(TM), Copper Mountain's robust Internet Protocol (IP) service intelligence, service providers can maximize bandwidth utilization, support value-added broadband services, and scale to meet the demands of hundreds of thousands of subscribers. Copper Mountain's CopperRocket(R) CPE family and CopperCompatible(R) program ensure that Copper Mountain DSL concentrators are interoperable with the broadest range of customer premise equipment (CPE). Customers wanting more information about Copper Mountain products or office locations worldwide can contact Richard Washbourne at 650/687-3380 or visit the company's World Wide Web site at http://www.coppermountain.com. For investor relations information, call toll free 1.877.INFO.CMTN (463.6268) or contact us at [e-mail].

Portions of this release contain forward-looking statements regarding future events and are subject to risks and uncertainties, such as factors which could affect future revenue and earnings. Copper Mountain wishes to caution you that there are some factors that could cause actual results to differ materially from the results indicated by such statements. These factors include, but are not limited to: rapid changes in the service provider landscape and among our CLEC customer base, quarterly fluctuations in operating results attributable to the timing and amount of orders for our products, factors affecting the rate of DSL deployment by our customers, market acceptance of our products, the concentration of our revenue in a small number of customers, our ability to penetrate the international, multi-tenant unit (MTU) and the incumbent telecommunications service provider (ILEC/IXC) market, risks related to integrating the operations and products of OnPrem Networks with our own operations and product offerings, risks related to our rapid growth, our ability to keep pace with rapidly changing product requirements, and factors affecting the demand for DSL technologies. We refer you to the documents Copper Mountain files from time to time with the Securities and Exchange Commission, specifically the section titled Risk Factors in our Annual Report on Form 10-K for the year ended Dec. 31, 1999 and other reports and filings made with the Securities and Exchange Commission.

Note to Editors: Quantum Bridge is a trademark of Quantum Bridge Communications, Inc.

Copper Mountain and all Copper Mountain product names are trademarks of Copper Mountain Networks, Inc. All other marks are the property of their respective owners.