External Communicatios Cable Colour Code

The table below gives the colour-coding for external communications cables up to 100 pairs. The colour-code is based on the five-colour sequence of Blue, Orange, Green, Brown, Slate which are used in that order with a White mate for the first five pairs.

 Knowing this sequence of five colours allows you to easily determine the order of the remaining pairs as follows:
The next five pairs use a Red mate (in place of the white mate), again using the "Line -" colours of   Blue, Orange, Green, Brown, Slate. The first ten pairs are bound together by a Blue binder-tape.

The second ten pairs repeat the sequence above, the only difference is that they are bound together with an Orange binder-tape. The binder-tape colour-sequence is shown below.

Pair	Line +	Line -
1	White	Blue
2	White	Orange
3	White	Green
4	White	Brown
5	White	Slate
6	Red	Blue
7	Red	Orange
8	Red	Green
9	Red	Brown
10	Red	Slate