ADTRAN Eases ISDN Installation with New Patents and AO/DI Technology; ADTRAN introduces Express 3000 ISDN modem.

HUNTSVILLE, Ala.--(BUSINESS WIRE)--June 16, 1998--ADTRAN, Inc. (NASDAQ: ADTN) today announced the Express 3000(TM), the newest member of ADTRAN's broad family of ISDN modems. The Express 3000 is a compact, feature-rich product designed specifically for the small office/home office market and remote workers seeking access to the corporate LAN or Internet. With this product, ADTRAN has again set the standard for helping ease the ISDN installation process.

ADTRAN's patented Expert ISDN technology and support for Auto SPID downloading from Lucent switches are both included in this product and eliminate the frustrations normally associated with ISDN modem setup. In most cases the user need only enter the telephone numbers of the ISDN line and make three mouse clicks to configure the product. In areas where Lucent Auto SPID has been deployed by telephone companies and other service providers, the Express 3000 becomes plug-and-play compatible with the ISDN line.

ADTRAN has also included its patented innovative modem pass thru port, a solution that allows users of the ADTRAN Express 3000 to operate an analog modem and the Express 3000 over a single computer serial port. The modem pass thru port operates like an intelligent A/B switch allowing the Express 3000 and an external analog modem to share the same computer serial port and conserve hardware resources.

"The Express 3000 is the most feature-rich, cost-effective ISDN modem designed for the remote worker that ADTRAN has developed to date," said Leslie Conway, director of ADTRAN CPE marketing. "ADTRAN has developed a product that is so simple to install, even the ISDN novice can complete the installation process quickly and easily."

Always On Dynamic ISDN (AO/DI) technology has been included in the Express 3000 at no additional cost. AO/DI is a new feature offered by some service providers and allows the user to maintain a virtual connection to the corporate LAN or Internet and reduces usage costs associated with ISDN in some areas.

Pricing and Availability

The Express 3000 is scheduled to ship by June 30, 1998 with a list price of $369. ADTRAN's patented Expert ISDN(TM)) automatic SPID and switch detection algorithms can be licensed for use in other vendors' equipment. For more information please contact ADTRAN at 1.800.9ADTRAN (1.800.923.8726).

About ADTRAN

Established in 1985, ADTRAN is a leading provider of total system solutions for delivering today's digital transmission technologies over existing telecommunications infrastructures. The company is best-known for developing cost-effective, high-performance equipment that transforms copper wire local loops into high-speed digital networks. An ISO 9001 registered company, ADTRAN is a top supplier of DDS, ISDN, Frame Relay, T1/FT1 and HDSL products. ADTRAN customers include the Regional Bell Operating Companies (RBOCs) and many of the more than 1,300 independent Telcos in the United States.

ADTRAN also designs and manufactures products for private end users in the customer premises equipment (CPE) market. IDC recently reported that ADTRAN holds the number one market share position for worldwide shipments of DSU products in the DDS multi-rate category, claiming almost 15 percent of the worldwide market. IDC also reported that ADTRAN captured 20 percent of worldwide revenues for T1/FT1 DSU/CSUs. For more information, contact the company at 1.800.9ADTRAN (1.800.923.8726) or via e-mail at [e-mail]. On the web, visit www.adtran.com.

    CONTACT:  ADTRAN
               Amy Smith, 256/963-8083
               [e-mail]
               or
               Baron, McDonald & Wells
               Laura Borgstede, 919/468-1323
               [e-mail]