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From: bob@uhmanoa.UUCP (Bob Cunningham)
Newsgroups: comp.dcom.lans
Subject: making up your own transciever cables
Message-ID: <285@uhmanoa.UUCP>
Date: Fri, 18-Sep-87 12:43:23 EDT
Article-I.D.: uhmanoa.285
Posted: Fri Sep 18 12:43:23 1987
Date-Received: Sun, 20-Sep-87 03:19:30 EDT
Organization: Hawaii Institute of Geophysics
Lines: 47
Keywords: AUI cable


Parts list and how to make up an ethernet transceiver cable.

	AMP part no. 745652-2		pin kit
	AMP part no. 745583-5		matching slide lock kit
	AMP part no. 206514-1		metallic hood (right-angle, need 2)
	DA15P				D-15 shell (solder type)
	DA15S				D-15 shell (solder type)
	Belden cable no. 9891		transceiver cable, 4pairs 20AWG
	(alternate: Alpha no. 9853)

[Amphenol has parts equivalent to the AMP ones, I don't know the exact
part numbers.  Also, cable from Consolidated and other cable shops work
as well.]

The pin kit and one hood goes on the male D-15 shell.  The slide lock
kit and the other hood goes with the female D-15.

All wires in the cable go "straight across" (e.g., pin 10 on the male
to pin 10 on the female, etc.)

The active connections are:

	one pair: pins 3, 10
	one pair: pins 5, 12
	one pair: pins 2, 9
	one pair: pins 6, 13	(if one pair is heavier gauge use it here;
				 this is the power pair, usually coded
				 black & red, supposedly PVC [vice FPP]
				 insulated, sometimes heavier gauge.)

The outer shield of the cable gets connected to pin 1, hood and shell
(i.e., short it out against the shell, as well as pin 1).

That's all there is to it for Ethernet v.1 & v.2, except that if the
cable has a separate inner shield, that should be in contact with the
outer shield as well.

For an IEEE 802.3 cable, there are supposedly two separate shields in the
cable: an inner shield and an outer shield.  The inner shield is supposed
to be connected to pin 4, while the outer shield.  This may be trivial,
since cables wired in the old way (without the separate inner shield
and its pin 4 connection) seem to work just fine.

-- 
Bob Cunningham
bob@hig.hawaii.edu