Advanced Radio Telecom To Trial 100 Mbps Wireless Network in Silicon Valley Using Triton Network Systems' Invisible Fiber Product.

BELLEVUE, Wash.--(BUSINESS WIRE)--June 8, 1999--

Advanced Radio Telecom Corp. (Nasdaq:ARTT) announced today that it will utilize Triton Network Systems' consecutive point 100 Mbps radio as part of a trial broadband network platform providing Internet access to selected businesses in Silicon Valley.

The trial will evaluate the reliability, quality and cost-effectiveness of deploying consecutive point-based wireless networks using Triton Network Systems' Invisible Fiber(TM) Internet products.

"As we announced recently, ART will be accelerating its plans to build broadband wireless metropolitan area networks in 40 of the top 50 communications markets over the next few years," said Henry C. (Harry) Hirsch, chairman & CEO of ART. "With the successful completion of the Triton Invisible Fiber Internet trial, we intend to incorporate their radio into our network as one of several potential technologies to best serve our customers. Consecutive point architecture should allow us to deliver broadband IP connectivity to businesses at a price far less than currently available in the marketplace."

This pilot network will provide 100 Mbps IP connectivity to five multi-tenant buildings. The test will begin this month and run for 90 days. Triton Network Systems' Invisible Fiber Internet product allows ART to provide a 100Base-T connection from the customer premise to ART's point of presence (POP), which simplifies the network and could lead to a significant reduction in infrastructure cost.

"Because of the consecutive point architecture and the quality of the Triton Network Systems' Invisible Fiber Internet product line, broadband fixed wireless networks are inherently self-healing and route diverse, providing a level of reliability suitable for e-commerce and the many new advanced applications under development," said Brian Andrew, president & CEO of Triton Network Systems. "Triton Network Systems' Invisible Fiber Internet product offers never-before-available speed and the assurance of highly reliable Internet services."

Last week, ART announced that Qwest Communications International Inc. (Nasdaq:QWST), and a group of high-tech investment funds -- syndicate leader Oak Investment Partners, MeriTech Capital Partners, Advent International, Accel Partners, Brentwood Venture Capital, Worldview Technology Partners, Bessemer Venture Capital, Adams Capital Management -- have signed a definitive agreement for a $251 million equity investment that is to expedite the deployment of ART's high-speed wireless network.

About ART

Advanced Radio Telecom (Nasdaq:ARTT), headquartered in Bellevue, Wash., is a facilities-based, broadband ISP providing a direct connection between the customer premises and the Internet. ART owns and operates metropolitan area networks in Seattle, Portland and Phoenix using fixed wireless and fiber optic technologies. ART owns or manages 38GHz spectrum licenses in more than 210 markets in the United States, including 49 of the top 50 and 90 of the top 100 markets. ART also owns 26GHz and/or 38GHz spectrum licenses in several European countries. ART offers a full range of Internet services including dedicated Internet access at speeds up to 10Mbps, e-mail, web hosting and web design, domain name server (DNS) registration, IP Fax and more. For more information, please visit ART's web site at www.art-net.net.

About Triton Network Systems

Triton Network Systems, Inc. is a leading provider of broadband fixed wireless network products. The company's Invisible Fiber(TM) high bandwidth broadband wireless network product line covers the 38 GHz, Local Multipoint Distribution Service (LMDS) and Local Multipoint Communication Systems (LMCS) markets, with functionality designed to fiber optic specifications. Triton Network Systems is funded by such venture capitalists as syndicate leader Oak Investment Partners, Worldview Technology Partners, Telesoft Partners, Advent International, Bessemer Ventures, Adams Capital Management and Chase Ventures. Capital investment represents more than $45 million in financial commitments and exemplifies the confidence that these investors have in Triton Network Systems' product line. Triton Network Systems is committed to producing products that will make possible the success of broadband fixed wireless in the telephony and data marketplace, and will enable the evolution of the Internet by delivering high-speed connections to businesses using and developing both e-commerce and up and coming applications for the Internet.

The above information includes forward-looking statements regarding potential future tests, deployment and business prospects. These statements are not guarantees of future performance. Known and unknown risks, uncertainties, and other factors, including without limitation, failure to consummate the financing transaction, capital requirements and other financial risks, customer demand, technological risks, the ability to meet financing conditions, management of growth, ability to achieve Year 2000 compliance, competition and government regulation may cause actual results to differ materially from the future results implied or expressed in the forward looking statements. Additional information about the most significant of such factors is set forth in ART's most recent annual report on Form 10-K. The Company does not undertake to update or revise its forward-looking statements publicly even if experience or future changes make clear that any projected results expressed or implied herein will not be realized.