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From: kwe@bu-cs.BU.EDU (kwe@buit1.bu.edu (Kent W. England))
Newsgroups: comp.dcom.lans
Subject: Re: Thin Ethernet/Coax
Message-ID: <6469@bu-cs.BU.EDU>
Date: Mon, 13-Apr-87 13:26:24 EST
Article-I.D.: bu-cs.6469
Posted: Mon Apr 13 13:26:24 1987
Date-Received: Sat, 18-Apr-87 18:45:15 EST
References: <2925@ptsfa.UUCP>
Reply-To: kwe@buit13.UUCP (Kent England)
Organization: Boston Univ. Information Tech. Dept.
Lines: 30
Keywords: Thin-Ethernet Coax RG58 RG59
Summary: Why ask for trouble?

In article <2925@ptsfa.UUCP> jmc@ptsfa.UUCP (Jerry Carlin) writes:
>
>We want to hook up a SUN 3/50 workstation in a cubicle that is wired
>for RG-59 coax and our thin ethernet is RG-58.  We therefore have a
>impedance mismatch since one coax is 50 ohm and the other is 75 ohm.
>Someone told us that if the distances were small we could ignore
>the mismatch.
>
Why ask for trouble?  If the distance is short, then the thin cable
shouldn't cost too much (that's where the "cheap" moniker came from).
How are you going to keep track of this kludge so that two years from
now and two dozen more workstations from now you will be able to
figure where this new glitch is coming from.  Visibility into this
level (the physical) from your system is tough.  These mismatch
problems are subtle.  It may work now, but I guarantee it won't work
later.  Save yourself trouble later and install thin cable.  Better
yet, get thin cable installed once and for all, if you are going the
thin route.  Save the RG-59 for Gilligan's Island reruns.
-- 
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