Ethernet DAMAGE by hazardous voltages (e.g. lightning)

Article View: net.lan

Article #49

#49

From: Ruurd van der Meer
Date: Wed, 27 Nov 1985 16:26

33 lines
1841 bytes

I am wondering what measures can be taken to avoid  x-million 
dollar damage by lightning on local network cables like 
Ethernet.
                         *
                        *
                       *
                      *****
                         *
                        *
                       *
                     ***
                     **
                     *

The standard says : the shield conductor of each coaxial cable
segment shall make electrical contact with an effective EARTH-
reference at ONE point. A lightning on the other side of the
segment can destroy a lot of interface units and possibly more.
We at OCE have a lot of buildings with Ethernet in between.
An expensive solution is using optical ways to seperate.

I know there are 'spike-' or 'surge-' suppressors to be put
in coaxial cables. The one I know are for IBM (93 ohm) cabling.
Does anyone know such suppressors for Ethernet cable (50 ohm) ?
What about reflections with these suppressors ?  

All ideas to avoid lightning problems on networks are welcome!

		Ruurd van der Meer  OCE  NEDERLAND  BV
				    Netherlands// Venlo

*****************************************************************

Technical Details

Message-ID: <84@oce-rd2.UUCP>

Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxn!ihnp4!qantel!lll-crg!seismo!mcvax!oce-rd1!oce-rd2!rvdm

Show Full Headers

Complete Article Headers

Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83 (MC840302); site oce-rd2.UUCP
Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxn!ihnp4!qantel!lll-crg!seismo!mcvax!oce-rd1!oce-rd2!rvdm
From: rvdm@oce-rd2.UUCP (Ruurd van der Meer)
Newsgroups: net.lan,net.dcom
Subject: Ethernet DAMAGE by hazardous voltages (e.g. lightning)
Message-ID: <84@oce-rd2.UUCP>
Date: Wed, 27-Nov-85 11:26:34 EST
Article-I.D.: oce-rd2.84
Posted: Wed Nov 27 11:26:34 1985
Date-Received: Fri, 29-Nov-85 21:41:11 EST
Organization: OCE R&D dept., Venlo, The Netherlands
Lines: 35