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From: geoffb@nrcvax.UUCP
Newsgroups: net.lan,net.dcom
Subject: Optical Network Links
Message-ID: <661@nrcvax.UUCP>
Date: Thu, 22-May-86 15:30:26 EDT
Article-I.D.: nrcvax.661
Posted: Thu May 22 15:30:26 1986
Date-Received: Sun, 25-May-86 11:19:10 EDT
Reply-To: geoffb@nrcvax.UUCP (G. Geoffrey Baehr)
Organization: Network Research Corp.
Lines: 44
Keywords: Links laser
Xref: watmath net.lan:1507 net.dcom:1937


	A short followup to my article of several months ago concerning
Ethernet repeaters/extenders.

	Many folks seem to desire an optical link for network extension, in the
case where fiber is too expensive or difficult to install, such as between
buildings in a campus environment. I turned up the following interesting
device/company.(NO, I don't work for them -:))

	Device: Optical Link, Dual IR diode/Fresnel Lens Assembly
		Range 250-400 meters
		Bandwidth 20mhz (higher with shorter ranges, can be cranked up)
		Aiming - Telescopic Sight
		Cost ~ $3000 per side.
		Accepts TTL signals. This thing is currently passing ProNet
		signals. Adapting an 802.3 transceiver to it in progress.

	Device: Optical Link, IR Laser/Fresnel Lens Assy
		Range 1km
		Bandwidth 100mhz (Also can be cranked up)
		Aiming - Telescopic Sight
		Cost ~ $7000 per side
		Accepts TTL signals. Currently is repeating T1 signals. 
		Ethernet transceiver being adapted.

	Company: Meret Laser, Santa Monica, California USA
		Contact: John Medved 213-828-7496

	As usual, at these frequencies (IR), you can expect attenuation in
heavy fog , caveat user. Hope this helps some out there who need to net
multiple bulildings together.


-- 
			"Book 'em Dano"

Geoffrey Baehr -  N6LXA	
					
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