Internal Telephone Cable Colour Code

Pair numbering commences at outer layer

Pair	Line +	Line -
1	White	Blue
2	White	Orange
3	White	Green
4	White	Brown
5	White	Slate
6	White	Blue/White
7	White	Blue/Orange
8	White	Blue/Green
9	White	Blue/Brown
10	White	Blue/Slate
11	White	Orange/White
12	White	Orange/Green
13	White	Orange/Brown
14	White	Orange/Slate
15	White	Green/White
16	White	Green/Brown
17	White	Green/Slate
18	White	Brown/White
19	White	Brown/Slate
20	White	Slate/White
21 - 40	Yellow	Repeat sequence
41 - 60	Black	Repeat sequence
61 - 80	Violet	Repeat sequence
81 - 100	Red	Repeat sequence

External Telephone Cable Colour Code

Pair	Line +	Line -	Binder Tape	Colours
1	White	Blue	Pairs 1 - 10	Blue binder
2	White	Orange	Pairs 11 - 20	Orange binder
3	White	Green	Pairs 21 - 30	Green binder
4	White	Brown	Pairs 31 - 40	Brown binder
5	White	Slate	Pairs 41 -50	Slate binder
6	Red	Blue	Pairs 51 -60	Blue/White binder
7	Red	Orange	Pairs 61 -70	Blue/Orange binder
8	Red	Green	Pairs 71 - 80	Blue/Green binder
9	Red	Brown	Pairs 81 - 90	Blue/Brown binder
10	Red	Slate	Pairs 9 1- 100	Blue/Slate binder

25 pair colour coding

The 25-pair colour code is a colour code used to identify individual pairs of conductors, in twisted pair telecommunications cable. The colours are applied to the insulation that covers each conductor. The first colour is chosen from one group of five colours and the other from a second group of five colours, giving 25 combinations of two colours.

The first group of colours are, in order: white, red, black, yellow, violet.
The second group of colours are, in order: blue, orange, green, brown, slate.
The 25 combinations are shown image below.

The first five combinations are very common in telecomms and data wiring worldwide but beyond that there is considerably more variation.

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Internal Telephone Cable Colour Code

Pair

Line +

Line -

External Telephone Cable Colour Code

Pair

Line +

Line -

Binder Tape

Colours

25 pair colour coding