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Path: utzoo!watmath!clyde!burl!ulysses!mhuxl!ihnp4!inuxc!pur-ee!CS-Mordred!CS-Arthur!cak
From: cak@CS-Arthur (Christopher A Kent)
Newsgroups: net.lan
Subject: Re: ground reference on Ethernets
Message-ID: <714@CS-Arthur>
Date: Wed, 22-Aug-84 14:29:20 EDT
Article-I.D.: CS-Arthu.714
Posted: Wed Aug 22 14:29:20 1984
Date-Received: Fri, 24-Aug-84 03:52:14 EDT
References: <403@cornell.UUCP>
Organization: Department of Computer Science, Purdue University
Lines: 15

As I understand it, ground voltage differences should not be a problem,
IF you follow the recommendation to only ground the shield of the ether
coax at one point. The transceiver power supply and signals between the
xcvr and host are isolated from the cable, so there is no possibility
for interference there.

If you ground the shield more than once, you'll almost certainly have
troubles.

Note that some transceivers have portions of their cases connected to
the shield ground, so nudging them into contact with a local ground can
cause ground loops that are VERY hard to find...

Cheers,
chris