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Industry Standard Wiring Plans

Industry Standard Wiring Plans

When you install more than a few terminals, you face the problem of organizing the wiring. AT&T has devised, for the telephone industry, a uniform scheme for dealing with large numbers of wires. The scheme uses two color codes--one for large numbers of wires organized in pairs, and the other for smaller numbers of wires which may also be organized in pairs. Cisco Systems recommends that you use 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 a "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, and 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.


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
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 can use a second color code scheme. Table B-2 shows 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 of the standard color code (white-blue, blue-white, and so on), while other times it uses the six alternate colored wires.


Second Color Code Scheme for Smaller Numbers of 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

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