Cisco Systems AS5800 manual Industry-Standard Wiring Plans

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Industry-Standard Wiring Plans

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 codes—one 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-groupof 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-1lists the sequences. Note that red-brown and red-orange wires can be easily confused.

Table B-1	Telephone Industry 25-Pair Color Code and Pin Numbers
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

Industry-Standard Wiring Plans B-1