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Info on Office Building Phone Wiring Schemes


NOTICE: TO ALL CONCERNED Certain text files and messages contained on this site deal with activities and devices which would be in violation of various Federal, State, and local laws if actually carried out or constructed. The webmasters of this site do not advocate the breaking of any law. Our text files and message bases are for informational purposes only. We recommend that you contact your local law enforcement officials before undertaking any project based upon any information obtained from this or any other web site. We do not guarantee that any of the information contained on this system is correct, workable, or factual. We are not responsible for, nor do we assume any liability for, damages resulting from the use of any information on this site.
Some Techno-info for phone cabling,
Most new business phones are currently being wired with "4 pair" cable.
this has been going on for quit some time. here are the color codes
and some of the common uses of these wires.

Color codes.
-------------

The cable is Usually grey.

The 4 pairs of wire inside have 4 colors: blue, orange, green and brown.

"4 pairs" of wire means "8" wires. (no shit)

Each pair is twisted together. thus 4 twisted pair. (no shit, no shit)

The "blue" pair consists of a blue/white wire and a white/blue wire.
this means:
the blue\white wire in the pair is mostly blue
with a white mark here and there. the white/blue wire is mostly
white with a blue mark here and there.
this goes for the other three colors also.

thus so far:

1 cable = 4 pairs = 8 wires

1 blue 1 white/blue
1 grey 2 blue/white
(or blue or clear)
2 orange 3 white/orange
4 orange/white

3 green 5 white/green
6 green/white

4 brown 7 white/brown
8 brown/white

* It is "standard" to refer to these wires in the above order.



* the dominant white of each pair is like a ground to the dominant color.
Think of them as four different speaker wires in one cable.

Are we getting any where yet?

*Note
--------
You should not play with these wires in "Your" place business. In some
phone systems you can Burn-Out the KSU if you touch/short the Pair.
(Now-a-days the system is usually protected from this.)
hmm... your boss will get shorted(temper) and you will get burnt!

Uses
--------------------------------------
Some background:
In most cases these wires lead to a "KSU". It is like a phone server
that lets many phones share a few "Bell" lines. The phone uses the
white/blue pair, and sometimes also the white/orange pair (meaning both
pairs simutainiously).

Sometimes there is more than one "item" on a cable
------------------------------------------------
In some cases a phone might get hooked up to the white/blue pair; and
a MODEM! or Fax to the white/orange OR white/green pair.
If there is a modem/fax line, It does not go thru the KSU. It goes
directly to a "Bell" dial tone. isn't this fun? ;)

Free long distance?
-------------------
In some really old buildings, Its been heard that a phone man will take a
wire out side of the building to get a line "down stairs and five rooms over."
Or they may run a line to the biulding next door. My cable tv guy ran my
cable out near the basement window and up to my 2nd floor.(dick-head!)

(get your laptop and modem ready, next we'll make a "jumper".)

A quick lesson on 25 pair cable
-------------------------------
25 pair? holy shit, thats 50 wires!
Yep, the cable is about 5/8 of an inch round. It uses the same scam, I
mean scheeeem, as the 4 pair.(but different)

Main rule: "Like" pairs.

blue orange green brown and slate(gray).

white Wht/Blu wht/orng
Blu/wht orng/wht ( a l l l i k e b e f o r e )

yellow ylw/blu ylw/orng ylw/grn ylw/brn
blu/ylw orng/ylw grn/ylw brn/ylw

black blk/blu
blu/blk

violet ( y o u f i l l i n t h e r e s t )

red red/blu red/ylw
blu/red ylw/red


What else about 25 pair?
------------------------
It is usually used in pairs. If you were looking for Dial Tone you would
First check the wht/blu pair. and work your way down all the pairs with
white, Then check all the pairs with yellow, and so on.

*Note
---------------
UnAuthorized "Pair Checking" may be viewed by your piers as UnEthical. :)
-What does that statement really mean?..... Don't get caught!


hmm.... one other cable. (usually in homes)
-----------------------
cable => 4 wires

grey 1 green
or tan 2 red
or black
3 black
4 yellow


The phone jack (and cable)
--------------
"cable" to "jack" | "cable" to "jack"
---------------------------|---------------------------------
at home: green to green | and red to red
|
at business: wht/blu to green | and blu/wht to red
wht/orng to blk | orng/wht to ylw

Well, I've had Enough for one Day.
 
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