Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!utgpu!water!watmath!clyde!cbosgd!ucbvax!jade!saturn!eshop
From: eshop@saturn.UUCP
Newsgroups: comp.dcom.lans
Subject: Re: making up your own transciever cables
Message-ID: <839@saturn.ucsc.edu>
Date: Fri, 18-Sep-87 21:10:21 EDT
Article-I.D.: saturn.839
Posted: Fri Sep 18 21:10:21 1987
Date-Received: Sun, 20-Sep-87 14:14:12 EDT
References: <285@uhmanoa.UUCP>
Reply-To: eshop@saturn.ucsc.edu (Jim Warner)
Organization: University of California, Santa Cruz; CIS/CE
Lines: 25
Keywords: AUI cable

We evaluated several kinds of transciever cable and ended
up selecting Manhatten 4190.  We like this cable because
it is signifcantly more flexible than transceiver cable
that has two shields.

We hook the drain wire up to both pins 1 & 4.  To get a
tight fit between the braid and the clamp on the hood,
we fold the braid back on top of the PVC jacket, leaving
enough jacket to extend into the area that is clamped.

We built a pair of boxes that we connect to either end
of a transciever cable.  One pulses the eight wires, each
at a different rate.  The other box has eight light emitting
diodes.  We use these to assure ourselves that all wires
are connected and in the right order.  The reason for this
paranoia is that a transciever cable that has a problem with
the collision detect pair will appear to work but the computer
will not be able to detect collisions.  

Finally, it is important that you stress to your technicians
that the pairing of the wires is extremely important.  Noise
immunity in xcvr cables comes from the three signals being
transmitted differentially.  If you get the wires paired wrong
you could created problems from cross talk that would be
very hard to diagnose.