Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!linus!philabs!cmcl2!seismo!hao!ascvax!pjk
From: pjk@ascvax.UUCP (Pat Keziah)
Newsgroups: net.lan
Subject: Re: Thin Ethernet
Message-ID: <123@ascvax.UUCP>
Date: Fri, 21-Feb-86 13:09:46 EST
Article-I.D.: ascvax.123
Posted: Fri Feb 21 13:09:46 1986
Date-Received: Mon, 24-Feb-86 06:05:48 EST
Distribution: net
Organization: Ampex Switcher, Wheat Ridge, Colorado
Lines: 23

A number of previous articles have pointed out various good strategies
for success with thin Ethernet.  But two critical points have been left
unclear, at least in my mind:

	1) The cable must be 50 ohm coax. (in our shop at least,
		75 ohm cable is commonly used for video signals)
	2) The cable MUST be terminated with 50 ohm resistors.
		(some previous discussions have alluded to
		leaving the cable open at the ends)

We have only used thin cable so far and we are getting good service
from it, but we are starting to see 2-3% of the packets have errors
now that we are running 400 feet of cable.  Our other big lesson so
far is that connector construction is extremely critical.  It must
be done well.

-- 

Pat Keziah				Ampex Switcher Company
{hao,boulder,avsdS}!ascvax!pjk		10604 West 48th Avenue
					Wheatridge,  CO  80033
					USA
					(303)423-1300 x226