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From: rdsnyder@MIT-CCC
Newsgroups: mod.telecom
Subject: (none)
Message-ID: <8703180506.AA28906@ucbvax.Berkeley.EDU>
Date: Mon, 16-Mar-87 19:44:40 EST
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Posted: Mon Mar 16 19:44:40 1987
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Subject: Re: color code for wire?

> DESIGNATION				TIP	RING	NOTES
> green wire of green/red pair		X
> red wire of green/red pair			X
> black wire of black/yellow pair	X		#1
> yellow wire of black/yellow pair		X	#1
> 
> NOTE 1: When used as pair for second telephone line in 4-wire cable
>
> <>  Larry Lippman @ Recognition Research Corp., Clarence, New York

The yellow/black pair above is reversed.
Yellow is TIP of the second pair in quad (4 cond. Gr/Rd/Yl/Bk cable) and
black is RING of the second pair.

The yellow/black pair is also used for getting 6-8VAC from a transformer in
the basement to the dial lamp on a Princess (700-type) telephone.

Yellow is sometimes used as a ground in 2-party service.  The ringing
voltage is applied from tip (green) to ground (yellow) to ring the tip-party's
phone and from ring (red) to ground to ring the ring-party's phone.

The yellow/black pair is also used in key systems as the A/A1 pair.  The
station equipment shorts A & A1 together while off-hook.


In multi-conductor cable,
White, red, black, yellow and violet are tip, and blue, orange, green,
brown, and slate are ring.  These colors are organized in a base 5
numbering system (not decimal, but easily converted).

-Ross