Infra-Red and Lan Bridges

Infra-Red and Lan Bridges

Post by Andrew A. Beverid » Sun, 11 Nov 1990 09:39:28

We are trying to connect our building to a campus Ethernet, which then
goes on to TCP/IP.  We cannot draw a cable under the street.  (Or if
we can it will take us ten years to find out.)  The computer center is
about 1/4 mile away.  We understand the Infrared is the way to go.

        1) What is the cost of such a set-up, and who would be a good vendor?

        2) Can Infrared simultaneously handle voice (like from a bunch of
           phones for a PBX.

We have priced one set-up out to around 18k.  Plus a spare Laser Gun
or whatever they are?  Any help would be greatly appreciated.  Please
E-mail me direct, and I will put up a summary.

Andrew A. Beveridge   Department of Sociology
Queens College and Graduate Center   City University of New York
209 Kissena Hall    Flushing, NY 11367  718-520-7093


1. 125 megabit infra-red --- brainstorm

Do you know of anyone that might be interested in this technology?

Can anyone think of applications not mentioned in this blurb?


DATE:     January 25, 1996

  The networking company claims it has leaped  the networking industry
with its latest release, an infra-red networking system that works
at distances of up to 500 meters at data transmission speeds of 125
megabits- per-second (Mbps) under normal weather conditions 230 meters under
 the worst conditions.

  A spokesperson for the company, told that
traditional infra-red systems have worked at between one and sixteen Mbps,
while for faster speeds, some networking companies have turned to laser

  "The problem with many laser "wireless" airlinks is that anyone who looks
into the line of the laser light puts their eyesight at risk," he said. "If
you put a laser airlink system on your roof and a guy who is  cleaning
windows happens to peek into the light source, the company opens itself up
to a possible lawsuit. With the new device, you avoid that problem, as
well as opening up high-speed transparent networking over long distances."

  The company claims that the system can operate at distances of several
kilometers, but the specified maximum is 500 meters. "This allows the system
to work in most weather conditions, including rain, snow, and light fog. At
longer distances you tend to get fading under certain weather conditions, so
we don't recommend beyond 500 meters for this reason," .

  A spokesman claims that the wireless infra-red airlink system is the
networking industry's first LED (light emitting diode)-based wireless system
to achieve ultra fast data rates, and so support ATM (asynchronous transfer
mode), Fast Ethernet (100Mbps) and FDDI (Fiber Distributed Data Interface)
bypass applications.

  Leasing fiber optic links between buildings can take
several months in some countries and situations. The system,
meanwhile, can be installed quickly and efficiently, with a complete system,
including two stations, costing from $10,000 to $15,000.

  "If you just want a single network application, such as Token Ring or
Ethernet, the price is the lower reaches of this band, while if you want a
transparent link that can handle all network technologies, it's towards the
higher end of this price band," was explained.

Merv Frankel
Speedy Computer Solutions
LAN/WAN Internetworking Specialists
144-16 68 Drive
Flushing,New York 11367-1735
718-263-8107 fax
beeper 917-883-0276    
or 1-800-800-7759  pin # 208753  to leave an actual message    

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