ADTRAN Introduces the Industry's First HDSL2 Repeater; Service Extension Makes Widespread HDSL2 Deployment a Practical Reality.

HUNTSVILLE, Ala.--(BUSINESS WIRE)--June 8, 1999--

ADTRAN, Inc. (NASDAQ: ADTN) introduced today the industry's first HDSL2 repeater, the H2R, that allows telephone companies to double their HDSL2 service range. ADTRAN is the only company in the industry offering HDSL2 extension capability, making HDSL2 a true T1 service alternative.

"Extension capability was the fundamental piece missing in practical HDSL2 deployment. Now that carriers can offer HDSL2 to nearly 100% of their customers, HDSL2 will become the obvious choice for high-speed digital services," said Kevin Morgan, Director of Product Development for the ADTRAN Carrier Networks Division. "ADTRAN HDSL2 opens up an important profit opportunity for carriers, because it effectively doubles the capacity of their existing HDSL loop infrastructure."

As consumers continue to demand greater bandwidth for high-speed Internet connection, video conferencing and telecommuting arrangements, telephone companies are looking for more efficient ways to offer DSL services. The advent of the 2-wire HDSL is another step in that direction, but the ability to offer the service throughout a carrier's service area ensures the success of HDSL2.

"ADTRAN is the number one technology and market share leader in DSL products," Morgan said. "Now we stand poised to lead the emerging HDSL2 market as well. That's no small accomplishment, since HDSL2 deployment has the potential to constitute more than 50% of the projected $500 million HDSL market by 2000."

ADTRAN introduced the H2R at the Supercomm trade show taking place this week in Atlanta, Georgia. Visit ADTRAN at Booth No. 5607 for more information about the H2R and the rest of ADTRAN's Carrier Networks product lines.

About ADTRAN

Established in 1985, ADTRAN, Inc. is a leading provider of network deployment and access solutions for delivering today's digital telecommunications services over existing copper infrastructures.

Today, ADTRAN technologies support more than two-million local loops worldwide. More than 500 ADTRAN products support all major digital technologies, including T3, T1, E1, Frame Relay, DDS, HDSL, xDSL, ISDN, and wireless transport. In the carrier network and enterprise markets, ADTRAN produces a complete end-to-end solution that provides the greatest network efficiency and lowest possible telecommunications costs.

According to Dataquest and IDC, ADTRAN holds revenue-leading positions in the Frame Relay/DDS, ISDN Extension and HDSL/T1/E1 network and access markets. ADTRAN customers include the Regional Bell Operating Companies, interexchange carriers, GTE, domestic independent service providers, corporate end users, international customers and original equipment manufacturers.

For more information, contact the company at 800 9ADTRAN (800/923-8726), 256/963-8000, or via e-mail at [e-mail]. On the web, visit www.adtran.com.