Pacific Bell Chooses ADTRAN Total Reach for Repeaterless ISDN Delivery; Two-Year Contract Awarded to Support Deployment.

HUNTSVILLE, Ala.--(BUSINESS WIRE)--April 4, 1997--ADTRAN, Inc. (NASDAQ: ADTN) announced today that it has signed a two-year contract to supply Pacific Bell with its repeaterless ISDN delivery system, Total Reach. ADTRAN's Total Reach will be used by Pacific Bell in its efforts to make ISDN available throughout its service area.

"This contract represents a large commitment to a system that will enhance Pacific Bell's aggressive response to customer requests for ISDN, as the Total Reach products afford a quicker, easier option for long-range ISDN deployment," ADTRAN Vice President of Telco Marketing Tom Stanton said.

Traditional deployment of Basic Rate ISDN service to locations beyond approximately three miles requires the use of an ISDN repeater, which regenerates the transmission signal. According to Pacific Bell, a significant number of its customers are located at distances that would have required repeaters to deploy ISDN service. The Total Reach ISDN products allow the extension of Basic Rate ISDN to distances of almost six miles, effectively doubling the deployment range of ISDN service. By eliminating the need for repeaters, Total Reach drastically reduces the labor-intensive and time-consuming process associated with repeater installation.

"We're delighted to have this product available to us," said Pacific Bell Executive Director of Transportation Engineering Glenn Anderson. "Total Reach will help Pacific Bell be more responsive in delivering long-range ISDN service. We are committed to leveraging technology that helps us meet our high standard of customer service." The Total Reach family of products uses ADTRAN's latest technological breakthrough called Simple Coded - Pulse Amplitude Modulation (SC-PAM) to extend digital services over one twisted pair of copper wires. This technology permits an extended range digital transmission by reducing the attenuation over the copper loop and increasing tolerance to noise.

The Total Reach ISDN system used by Pacific Bell includes the TRI-C central office unit and two different remote units. One is a stand-alone TRI-R 400 mechanics card, primarily for business customers, and the other is the TRI- RNID for residential customers. Pacific Bell is a California-based subsidiary of SBC Communications Inc., the nation's second-largest telecommunications company and a leading company in the global telecom industry. Through its subsidiaries, SBC provides innovative communications including local and long-distance telephone, wireless, paging, Internet access, cable TV and messaging services, as well as telecommunications equipment and directory advertising and publishing.

ADTRAN was established in 1985 to design, develop and manufacture advanced transmission products for high-speed digital communications. In addition to its HDSL products, ADTRAN is a primary provider of DDS and ISDN digital loop products to Regional Bell Operating Companies and many well known OEMs. The broad selection of customer premises products offered by ADTRAN includes a complete line of DSU/CSUs, a variety of ISDN extension and network terminating products and flexible T1 multiplexers. For more information regarding ADTRAN and its products, call 1-800-326-3700, fax [phone], or E-Mail: [e-mail]. ADTRAN can be found on the Internet at www.adtran.com.

CONTACT: ADTRAN

Stacy Thomas, 205-971-8488

[e-mail]

or

Pacific Bell

Shirley Macbeth, 415-394-3892