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Path: utzoo!watmath!clyde!burl!ulysses!harpo!seismo!hao!denelcor!lmc
From: lmc@denelcor.UUCP (Lyle McElhaney)
Newsgroups: net.lan
Subject: Re: Ethernet in conduit
Message-ID: <407@denelcor.UUCP>
Date: Fri, 27-Apr-84 14:51:42 EST
Article-I.D.: denelcor.407
Posted: Fri Apr 27 14:51:42 1984
Date-Received: Sat, 28-Apr-84 11:03:44 EST
References: <571@aplvax.UUCP>
Organization: Denelcor, Aurora, CO
Lines: 29

We were forced to run part of our Ethernet cable through conduit, due to
a very sticky fire code. The problems that we encountered included how
to install a tap in a box without unduly bending the cable, getting the
black marks to line up with the boxes, and having to remove terminations
to get the cable pulled, and then putting them back on. If a retap is
ever required in a box, we may have to punt.

Answers:
	- Measure the conduit runs between boxes carefully.
	- Get the holes in the boxes placed to minimize cable bending.
	- Get *big* boxes to put the tap in.
	- On transciever cables, use a pin removal tool to remove
	  pins from the 15-pin connector shell before pulling
	  the cable through. Don't splice a transciever cable.
	- You'll need to remove one terminator on the coax, pull it,
	  and then install the terrminator back on. You can splice
	  a coax, using two male ends and a female-female adapter.
	- Beware, throughout, that Ethernet specs do not allow a bend
	  in the coax togo below a 8 inch radius (I believe that's the
	  number).

Our cable was installed pretty badly (small boxes for the transcievers,
bends, spliced transciever cables), and we had to go to a lot of trouble
to prove we had defective equipment rather than a bad installation when
troubles arose. The net seems to work well in spite of all this, but
its best to play it safe.
-- 
		Lyle McElhaney
		(hao,brl-bmd,nbires,csu-cs,scgvaxd)!denelcor!lmc