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Subject: Re: color code for wire?

In a recent reply to my original article, rdsnyder@MIT-CCC writes:

> > 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
>
> 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.

	Sorry, but you are incorrect.  Black is always TIP and yellow is
always RING.  This true not only for inside station wiring, but for outside
direct burial two-pair "B" Service Wire.  I refer to AT&T System Practices
Sections 461-610-100 and 460-300-143 as examples in case anyone doubts
my statement.
	You may be confused by looking at the end of a modular plug and
thinking that TIP is one side of center, and RING is the other; the pin
locations on modular connectors are transposed every other pair (up to
the full 4-pairs for an RJ-45).

> 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 this application, the A-lead is the actual control line, and
the A1-lead is ground.  The A-lead is always the "tip" conductor and the
A1-lead is always the "ring" conductor, when the two are in the same pair.

> White, red, black, yellow and violet are tip, and blue, orange, green,
> brown, and slate are ring.

	Except, of course, when white/red, white/black, and yellow/red
is used for distributing frame jumper pairs... :-)

<>  Larry Lippman @ Recognition Research Corp., Clarence, New York
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