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.
Pairs Binder-tape colours
Pairs 1-10 Blue binder
Pairs 11-20 Orange binder
Pairs 21-30 Green binder
Pairs 31-40 Brown binder
Pairs 41-50 Slate binder
Pairs 51-60 Blue/White binder
Pairs 61-70 Blue/Orange binder
Pairs 71-80 Blue/Green binder
Pairs 81-90 Blue/Brown binder
Pairs 91-100 Blue/Slate binder
| 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 |