Telco Systems' EdgeLink500 FRAD Receives Certification.

NORWOOD, Mass.--(BUSINESS WIRE)--Aug. 10, 1998--Telco Systems, Inc. (NASDAQ:TELC) announced today that its EdgeLink500(TM) Frame Relay Access Device (FRAD) has passed rigorous testing and received certification from WorldCom.

With achievement of WorldCom's Frame Relay Network CPE Certification, the EdgeLink500 has been added to WorldCom's certified vendor list. Testing was completed at WorldCom's Enterprise Network Laboratory in Tulsa, OK. The lab analysis included compatibility tests run between the EdgeLink500 and Cascade 9000 Frame Relay switches in several scenarios including file transfer and other traffic tests.

Telco Systems' EdgeLink500 is a low cost, feature rich Frame Relay Access Device that enables multiprotocol LAN/WAN internetworking across public and private Frame Relay networks. The EdgeLink500 permits branch office users to access Token Ring and Ethernet LANs as well as business-critical SNA/APPN applications. In addition, it supports SNA/SDLC, bisync and async traffic. The EdgeLink500 ensures that legacy users capitalize on Frame Relay's favorable tariffs, higher bandwidths and low error rates. It provides an integrated solution for Frame Relay based networking that continually

optimizes bandwidth utilization while safeguarding the end-to-end delivery of mission critical data.

Features of the EdgeLink500 include:

-- Serial, Ethernet and Token Ring access -- RFC 1490 multiprotocol encapsulation of SNA (LLC2), bisync, async, IP and IPX

-- Guaranteed Bandwidth Facility and prioritization of data allows mission critical and client server data to be intelligently merged onto a single DLCI

-- Virtual Multidrop Facility enables SDLC, bisync or async lines to connect over Frame Relay to a multidrop

-- Automatic dial backup -- SNMP network management -- Telnet monitoring -- GUI configurator and auto configuration functions allow for easy installation

-- 56Kbps to 2Mbps Frame Relay User Network Interface (UNI) -- Intelligent Frame Relay Access for Async, IP, SDLC, IPX, Ethernet, Bisync, Token Ring and SNA

-- Stackability for multiport configuration

There are three models in the EdgeLink500 family: the 500t, which supports Token Ring and up to four serial ports; the 500e, which supports Ethernet and up to three serial ports, and the 500s which supports up to four serial ports. All three models are also available in rack mountable versions. Pricing starts at $1,095. For ordering information, call [phone].

About Telco Systems, Inc.

Telco Systems' integrated access solutions -- that are deployed at the network edge -- provide organizations with a flexible, cost-effective means of transmitting voice, data, video and image traffic over public and private networks. These products are used in a wide variety of applications by network service providers, such as interexchange carriers, local exchange carriers, government agencies, utilities and wireless providers, as well as by corporations around the world.

Telco Systems World Wide Web address is www.telco.com Note: The term EdgeLink500 is a trademark ((TM)) of Telco Systems, Inc.

   CONTACT: Telco Systems, Inc.
             Dianne Duffin, 781/255-5239
            (Release also available through
             Fax on Demand: 800-297-5020)