U.S. ROBOTICS ADDS X.25 TO TOTAL CONTROL INTERNETWORKING PRODUCTS

SKOKIE, Ill., -- January 24, 1994 -- U.S. Robotics, Inc., today announced
the addition of a full-featured X.25 PAD to its line of Total Control
internetworking products. The Total Control Integral X.25 PAD allows
asynchronous dial-up to X.25 packet-switched networks without cabling
individual modems to an external PAD. The X.25 PAD will be available in
March, 1994.

Total Control products support multiple protocols and interfaces,
integrating complete LAN/WAN connectivity in a single chassis. The X.25
PAD may be added to the Total Control Enterprise Network Hub and
Transaction Processing Hub, eliminating external equipment and RS-232
cables to increase performance and reduce per-channel cost.

"X.25 allows organizations to optimize their investment in their networks,"
said Jonathan Zakin, U.S. Robotics executive vice president. "X.25
networks can provide cost advantages over circuit-switched networks, and
can also provide an ideal solution for transaction processing
applications, where short bursts of data must be transmitted quickly
without error. "

The X.25 protocol is widely used in a variety of applications, including
inquiries to corporate databases from remote sites, insurance claims
processing, electronic mail, and point-of-sale transaction processing.

"X.25 is the standard transmission protocol for the Ameritech Packet
Switched Network, and is positioned to be the backbone for data
transmission throughout the region," said Bill Fitzpatrick, applications
manager for Ameritech. "X.25 is data efficient and customer-friendly,
making it easy for the customer to connect to the Ameritech network."

The X.25 PAD consists of an Application Card and a dual V.35/RS-232
Interface Card. The Application Card is available in 24- or 60- channel
versions. The Interface Card supports two high-speed,
software-configurable V.35 or RS-232 ports to connect the PAD to an X.25
network, and supports speeds up to 2.048 Mbps in V.35 mode and 57.6 Kbps
in RS-232 mode.

Additionally, the product supports several features that dramatically
increase the number of calls it can handle. Automatic call routing reduces
call setup time by automatically routing incoming calls to their
destination via ANI (Automatic Number Identification), DNIS (Dialed Number
Identification Service) or subscriber ID. Automatic channel configuration
allows dynamic configuration of all asynchronous channels based on ANI,
DNIS or subscriber ID. The product will also support protocol spoofing
(VISA 1, VISA 2 and T3POS) to reduce transaction processing times.

Like other Total Control Gateway Cards, such as Ethernet, Token Ring and
Frame Relay, the X.25 PAD is user-programmable through an API
(Applications Programming Interface), which allows users to easily
customize the product to handle a wide variety of application-specific
features and protocols.

The Enterprise Network Hub enables organizations with remote locations,
telecommuters and mobile employees to aggregate their dial traffic onto
T-1 lines and route it through a packetswitched network to their host
computer at a central site. The Transaction Processing Hub reduces
verification times for credit card, point-of-sale, and inquiry/response
transaction processing applications by interfacing with local exchange
carrier services, such as Feature Group B and D.

The Enterprise Network Hub and Transaction Processing Hub are logical
extensions of the company's Total Control product line; U. S. Robotics'
Total Control line of intelligent modem management systems, introduced in
1990, was the company's first entry into this market.

Both products use a common architecture, which consists of a 1 Gbps
midplane, and circuit and packet-switched buses to minimize processing
time. Through downloadable software-defined technology, U.S. Robotics can
easily modify and enhance its products to take advantage of new and
emerging technologies.

U. S. Robotics, Inc., (NASDAQ:USRX), is a leading designer, manufacturer
and marketer of data communications systems and products. Both corporate
headquarters and manufacturing operations are based in Skokie, Illinois.
U.S. Robotics owns and operates U.S. Robotics Ltd. in Slough, England,
U.S. Robotics, s.a. in Lille, France and P.N.B. s.a., based in Suresnes,
France. The company markets its products to business, industry, government
agencies and original equipment manufacturers, and to end-users through
the personal computer distribution channel.

U.S. Robotics, 8100 North McCormick Blvd, Skokie, IL 60076
800-DIAL-USR;  708-982-5010

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