Marc Evans writes:
> Thanks for the correction. I took my color codes from the T568A spec,
> whereas you quote the T568B spec. Clearly either will work, though the one
> you quoted is probably more commonly used.
>
> - Marc
>
> On Tue, 20 Mar 2001, Dana S. Tellier wrote:
>
> > Hey, all--
> >
> > I know this is a picky thing, but the pinouts-to-colors you've
> > described (to my knowledge) aren't what I've seen to be the
> > "standard". Generally, I've seen a straight-through as:
> >
> > 1 white/orange
> > 2 orange
> > 3 white/green
> > 4 blue
> > 5 white/blue
> > 6 green
> > 7 white/brown
> > 8 brown
...
Just be sure that you don't use the USOC 8x8 spec, where each
pair is symetricly spread around the center.
And so long as we're being picky, the official colors for pins
2, 4, 6, and 8 above would be orange/white, blue/white, green/white,
and brown/white. In case anyone is confused white/orange has lots of
white with a thin helical orange "trace", while orange/white, the
"mate" is mostly orange with a thin helical white stripe.
But if you have cable that wasn't made with a phone company in
mind, you may well have solid blue, etc., wires.
Also, for 10/100baseT cables made from wiring with just two
pairs, you will see:
1 white/blue
2 blue/white
3 white/orange
4 NC
5 NC
6 orange/white
7 NC
8 NC
That's because in the telephone world, whose connectors and
color schemes we're borrowing, the white - blue pair is always pair
number 1 and white - orange is pair number 2, so if you have cable
with just two pairs, those are the colors that you get.
For completeness, in case you have a 5 or more line telephone,
white - green is pair 3, white - brown is pair 4, and white - slate
(gray) is pair 5. Then you change white to red and start over with
blue for pairs 6 through 10. Black gets you 11 - 15, yellow gets 16 -
20, and violet 21 - 25. There are 25 pairs in a typical within the
building many pair telephone cable, and that exactly fills the typical
50 pair punch down (or Qwik Connect) block, or one side of a "split
50". Larger cables are subdivided into 25 pair groups, each group
wrapped, I believe, with a piece of colored lacing, whose color coding
I don't know.
The two wires of a pair are named "tip" and "ring" (for the
components to which they connect on the plug of an old fashioned
manual switchboard, which looks a lot like a stereo headphone plug).
Tip is the wire that has more of white, red, black, yellow, or violet,
and ring is the wire that has more of blue, orange, green, brown, or
slate. Tip is usually the more positive (actually less negative) in
normal operation, which is probably why the 10{0,}baseT people chose
to put signals T+ and R+ on tip wires and signals T- and R- on ring
wires.
Token ring, if anybody cares, puts T+ on 3, R- on 4, R+ on 5,
and t- on 6. If there are only two pairs in the cable, they use 5, 4
as pair 1 (white - blue) and 3, 6 as pair 2 (white - orange).
Bill
**********************************************************
To unsubscribe from this list, send mail to
[EMAIL PROTECTED] with the following text in the
*body* (*not* the subject line) of the letter:
unsubscribe gnhlug
**********************************************************
