Mike's PBX Cookbook

25 Pair Color Code

The 25-pair color code is used to identify individual conductors in a telecommunications twisted pair cable. The colors are marked on the conductors insulation. The first (or major) color is chosen from one group of five colors and the other (or minor) color from a second group of five colors, giving 25 combinations of two colors. The tip is always first, and pairs should never be split.

Major colors:Tip (+)WhiteRedBlackYellowViolet'A' wire

Minor colors:Ring (-)BlueOrangeGreenBrownSlate'B' wire

Note: Telecom equipment is "positive ground": tip is 0 volt with respect to ground (earth), ring is -50 volt.

No. Pair Major color / Tip (A)   Minor color / Ring (B)

1 White   Blue
2 Orange
3 Green
4 Brown
5 Slate

6 Red   Blue
7 Orange
8 Green
9 Brown
10 Slate

11 Black   Blue
12 Orange
13 Green
14 Brown
15 Slate

16 Yellow   Blue
17 Orange
18 Green
19 Brown
20 Slate

21 Violet   Blue
22 Orange
23 Green
24 Brown
25 Slate

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