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From: hes@ecsvax.UUCP (Henry Schaffer)
Newsgroups: net.dcom,net.lan
Subject: Re: Ethernet between buildings?
Message-ID: <589@ecsvax.UUCP>
Date: Thu, 17-Oct-85 14:22:11 EDT
Article-I.D.: ecsvax.589
Posted: Thu Oct 17 14:22:11 1985
Date-Received: Sun, 20-Oct-85 05:52:19 EDT
References: <408@anucsd.OZ>
Organization: NC State Univ.
Lines: 27
Xref: watmath net.dcom:1388 net.lan:1100

> Our department is about to move to another building.   In our current
> current building we have an ethernet ...  We wish to run our ethernet
> connection from our new building to the old ...  The distance between 
> the buildings is about 100 meters [of open ground].
> 
> The problem is to protect the ethernet (i.e. the machines on it)
> between the buildings from bizarre things like lightning strikes. 
> ... a fibre optic link with bridges at both ends. ...
> 
> We are looking for a cheaper way of doing this. ... Can you provide 
> enough shielding for the cable so that bridges etc are not necessary?  
> Help ...
> 
> Peter Wishart	    Computer Science, Australian National University, Canberra
> 
> CSNET: pjw%anucsd.oz@csnet-relay	ARPA: pjw%anucsd.oz@seismo.CSS.GOV
> UUCP:   {seismo,ubc-vision,ukc,mcvax,prlb2}!munnari!anucsd.oz!pjw

  Have you looked into putting the cable underground.  Some cable can be 
directly buried, but it is preferable to bury a couple of 4" pipes (plastic
is ok) and then pull the cable(s) through it.  This appears to be very good
protection against lightning, etc.  The only problems I've then seen with
lightning are a strike on one of the buildings conducted into the underground
wires.  You also may then have to be concerned about differences between 
ground voltages in the two buildings.  Having the underground "duct work" 
then allows installation of other wires for the cost of the wires and pulling.
--henry schaffer