New E1 Integrated Radio System Eases International Wireless WAN Management

Thirty Percent Faster Than T1: Also Available In U.S.

May 16, 1995 -- Sunnyvale, CA--Cylink Corporation announced that it will
demonstrate the new AirLink E1 radio at Wireless Datacomm, May 16-17 in
San Jose, CA.

The new AirLink E1 radio that brings wireless 2.048 Mbps speed to
international WANs. The E1 can also be used domestically for isolated
wireless point-topoint WAN links when communications equipment is not
connected to the North American communications network.

Like the AirLink T1 radio, which is designed for domestic WANs, the AirLink
E1 radio links together PBX, KTSs, multiplexers, bridges and routers at
megabit speeds at ranges up to about 20 miles.

Intemational telephone companies and carriers can use AirLink E1 to link
remote Subscriber Loop Concentrators, cellular antenna sites and
Specialized Mobile Radio (SMR) sites.

The AirLink E1 radio processes 30 percent more traffic over the same path
than its domestic AirLink T1 cousin (2.048 Mbps versus 1.544 Mbps) and,
when used for voice only systems, carries 32 64kbps channels, compared to
the T1's 24 channels.

AirLink E1 features a weather-proof housing for easy outdoor installation
and maximum range. The AirLink E1 integrated radio system includes the
AirLink E1, an E1 Access Unit and a 2ft. or 4ft. parabolic antenna.

Interface Designed For Easy Management

The AirLink E1 is easy to manage with new user interface software for
terminal or modem interface that allows network administrators to manage
and monitor the radio from a desktop or laptop PC at either end of the
point-to-point link or remotely by dial-up modem from a centralized
management facility.

With user-selectable configuration and control parameters resident in the
AirLink E1's non-volatile memory, the network manager can change
configuration parameters, query current status and performance
information, review event logs and run diagnostic tests.

Network Flexibility

Network managers, internationally and domestically, are turning more and
more to wireless WANs as an alternative to wired solutions to connect
remote "corporate orphans." Remote locations are often in areas already
crowded with filled conduit or are isolated in areas where cable simply
can't reach.

Wireless WANs are also seen as sound economic alternatives to wire
connectivity. The AirLink E1 radio system, for instance, can eliminate E1
installation charges and monthly lease charges.

Spread Spectrum Radio Reliability

The Cylink AirLink E1 System is a spread spectrum transceiver that operates
in the 5.725 to 5.850 GHz range in the Industrial Scientific Medical (ISM)
band. AirLink E1 uses a spread spectrum modulation technique to create a
high quality, point-to point radio link between itself and another AirLink
E1 radio located miles away.

The AirLink E1 Radio System features time division full duplexing for
noninterrupted, complete data transmission.

Priced at about $20,000 per link, installed with a pair of AirLink E1
radios and 2 ft. parabolic antennas, the AirLink E1 system is available
for immediate shipment.

The AirLink E1 radio is the most recent addition to Cylink's AirLink
wireless communications family to be introduced in the past six months. In
August, the company introduced the AirLink Bridge, the wireless bridge
that set the industry standard for combined range, rate and robustness.

Cylink Corporation is the international leader in advanced spread spectrum
radio technology that has leveraged innovations in information and network
security into wireless remote internetwork technical leadership. The
Company was founded in 1984 and is an affiliate of the Pittway
Corporation.

Cylink Corporation
910 Hermosa Court
Sunnyvale, CA., 94086
Telephone: (408) 735-6668
Fax: (408) 720-8294.

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