Appendix; Industry-Standard Wiring Plans - Cisco Router 7204 Installation And Configuration Manual

Industry-Standard Wiring Plans

When you install more than a few terminals, you face the problem of organizing the wiring. AT&T has
devised a uniform scheme for dealing with large numbers of wires for the telephone industry. The
scheme uses two color codes—one for large numbers of wires organized in pairs and the other for smaller
numbers of wires that may also be organized in 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 two
groups of five, 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 A-1
Table A-1
Pair Number
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
OL-5101-02
lists the sequences. Note that red-brown and red-orange wires can be easily confused.
Telephone Industry 25-Pair Color Code and Pin Numbers
Wire Number
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
A P P E N D I X
Solid Color Stripe Color
White Blue
Blue White
White Orange
Orange White
White Green
Green White
White Brown
Brown White
White Slate
Slate White
Red Blue
Blue Red
Red Orange
Orange Red
Red Green
Green Red
Cisco 7204 Installation and Configuration Guide
A
Pin Number
26
1
27
2
28
3
29
4
30
5
31
6
32
7
33
8
A-1