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When you order multiple internetwork systems, you face the problem of organized wiring. In response to this problem, AT&T has devised a uniform wiring scheme for the telephone industry. The wiring scheme uses two color codesone for a large number of wires that are organized into pairs, and one for a smaller number of wires that might also be organized into pairs. We recommend the use of this wiring scheme whenever possible.
For large numbers of wires, each pair is assigned a two-color code. The colors are selected from 2 groups of 5, resulting in what is called a binder-group of 25 pairs. The colors used for a group are white, red, black, yellow, and violet. The colors used for "pair within group" are blue, orange, green, brown, and slate.
Each pair must have a unique color combination. One wire within each pair has a solid background of its group color and stripes of the "pair within group" color; the second wire has the colors reversed. Table B-1 lists the sequences. Note that red-brown and red-orange wires can be easily confused.
Pair Number | Wire Number | Solid Color | Stripe Color | Pin Number |
---|---|---|---|---|
1 | 1 | White | Blue | 26 |
1 | 2 | Blue | White | 1 |
2 | 1 | White | Orange | 27 |
2 | 2 | Orange | White | 2 |
3 | 1 | White | Green | 28 |
3 | 2 | Green | White | 3 |
4 | 1 | White | Brown | 29 |
4 | 2 | Brown | White | 4 |
5 | 1 | White | Slate | 30 |
5 | 2 | Slate | White | 5 |
6 | 1 | Red | Blue | 31 |
6 | 2 | Blue | Red | 6 |
7 | 1 | Red | Orange | 32 |
7 | 2 | Orange | Red | 7 |
8 | 1 | Red | Green | 33 |
8 | 2 | Green | Red | 8 |
9 | 1 | Red | Brown | 34 |
9 | 2 | Brown | Red | 9 |
10 | 1 | Red | Slate | 35 |
10 | 2 | Slate | Red | 10 |
11 | 1 | Black | Blue | 36 |
11 | 2 | Blue | Black | 11 |
12 | 1 | Black | Orange | 37 |
12 | 2 | Orange | Black | 12 |
13 | 1 | Black | Green | 38 |
13 | 2 | Green | Black | 13 |
14 | 1 | Black | Brown | 39 |
14 | 2 | Brown | Black | 14 |
15 | 1 | Black | Slate | 40 |
15 | 2 | Slate | Black | 15 |
16 | 1 | Yellow | Blue | 41 |
16 | 2 | Blue | Yellow | 16 |
17 | 1 | Yellow | Orange | 42 |
17 | 2 | Orange | Yellow | 17 |
18 | 1 | Yellow | Green | 43 |
18 | 2 | Green | Yellow | 18 |
19 | 1 | Yellow | Brown | 44 |
19 | 2 | Brown | Yellow | 19 |
20 | 1 | Yellow | Slate | 45 |
20 | 2 | Slate | Yellow | 20 |
21 | 1 | Violet | Blue | 46 |
21 | 2 | Blue | Violet | 21 |
22 | 1 | Violet | Orange | 47 |
22 | 2 | Orange | Violet | 22 |
23 | 1 | Violet | Green | 48 |
23 | 2 | Green | Violet | 23 |
24 | 1 | Violet | Brown | 49 |
24 | 2 | Brown | Violet | 24 |
25 | 1 | Violet | Slate | 50 |
25 | 2 | Slate | Violet | 25 |
Cables with more than 25 pairs of wires are constructed from 25-pair groups. Very large cables have other variations generally not encountered inside terminal wire plants.
For smaller numbers of wires, such as wires for an individual telephone station or terminal, you may use a second color-code scheme. Table B-2 lists this color code and the usual correspondence with the paired-wire color code. The alternate color code is included because sometimes the station wire uses the first three pairs from the standard color code (white-blue, blue-white, and so on), while at other times it uses the six alternate colored wires.
Pair Number | Wire Number | Solid Color | Stripe Color | Alternate Color | Pin Number |
---|---|---|---|---|---|
1 | 1 | White | Blue | Green | 4 |
1 | 2 | Blue | White | Red | 3 |
2 | 1 | White | Orange | Black | 2 |
2 | 2 | Orange | White | Yellow | 5 |
3 | 1 | White | Green | White | 1 |
3 | 2 | Green | White | Blue | 6 |
Posted: Tue Nov 20 17:22:23 PST 2001
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