GDC's APEX ATM SWITCHES SUCCESSFULLY PERFORM IN JET PROPULSION LAB'S ATM DEMONSTRATION FOR NASA; GDC's ATM Solutions Demonstrate Powerful Voice and Video Capabilities.

LAS VEGAS--(BUSINESS WIRE)--March 27, 1995--General DataComm, Inc. (NYSE: GDC), the leader in providing real business solutions based on Asynchronous Transfer Mode (ATM) products and services, today announced the successful demonstration of its APEX-ATM switches at the Jet Propulsion Laboratory (JPL). GDC's ATM solutions demonstrated the successful transfer of multimedia applications over a simulated satellite link without any network downtime or voice or video degradation. The demonstration served as a test run for a new international ATM network, which will be fully deployed by the middle of 1996.

With the new capabilities GDC's APEX-ATM solutions provide, NASA will be able to effectively support the transfer of data from unmanned interplanetary spacecraft missions, orbiting satellites, and radio and radar astronomy observations in the exploration of the solar system and the universe. GDC's APEX-DV2 switches will be installed in JPL's Deep Space Network to help NASA simultaneously communicate scientific data, administrative data, voice, and video with substantially greater circuit utilization, thus reducing current and future costs. Once the data is collected, GDC's APEX-DV2 switches will enable NASA to rapidly route the information back to scientists around the world.

"After an exhaustive evaluation process, JPL's selection of GDC's switches is a testament to the comprehensive nature of our ATM switches," said Michael C. Thurk, senior vice president of marketing and services for General DataComm. "GDC is the only ATM vendor capable of delivering critical features such as a broad breadth of interfaces for legacy equipment, advanced traffic policing and congestion control, and compliance to ATM Forum standards."

"We chose GDC's solution because we needed to support different classes of traffic over shared overseas circuits and reduce recurring costs," said Dr. Rick Markley, project manager, Jet Propulsion Labs. "GDC provided us with outstanding service and support."

GDC's APEX-DV2 is an enterprise premises switch for campus or private network environments that have numerous types of networking equipment (i.e., data, voice, video, LANs). This switch is typically configured as a concentration point for all networking equipment located in a building or campus site.

The GDC APEX family of ATM switches also includes the APEX-NPX designed to meet the demanding requirements of telecommunications service providers, and APEX-MAC, designed to extend the reach of ATM technology from the edge of an enterprise or service provider's network to smaller workgroup and traffic locations. GDC APEX is a scalable system that can easily and cost effectively be upgraded to accommodate network growth.

General DataComm is the leader in providing real business solutions for enterprise and telecommunications networks based on ATM products and services. Its extensive product line includes the APEX family of ATM switches, LAN internetworking products, multiplexers, digital data sets and high-speed dial-up modems. Based in Middlebury, Connecticut, GDC provides communications solutions worldwide.

CONTACT: General DataComm

Tom Shea, 203/574-1118

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The Weber Group

Kathy Wilson/Eric Eddy, 617/661-7900