Pair Colour of insulation (Wide band, base colour in capitals).
a - wire b - wire
1 WHITE - Blue BLUE - White
2 WHITE - Orange ORANGE - White
3 WHITE - Green GREEN - White
4 WHITE - Brown BROWN - White
5 WHITE - Grey GREY - White
6 RED - Blue BLUE - Red
7 RED - Orange ORANGE - Red
8 RED - Green GREEN - Red
9 RED - Brown BROWN - Red
10 RED - Grey GREY - Red
11 BLACK - Blue BLUE - Black
l2 BLACK - Orange ORANGE - Black
13 BLACK - Green GREEN - Black
l4 BLACK - Brown BROWN - Black
15 BLACK - Grey GREY - Black
16 YELLOW - Blue BLUE - Yellow
17 YELLOW - Orange ORANGE - Yellow
18 YELLOW - Green GREEN - Yellow
19 YELLOW - Brown BROWN - Yellow
20 YELLOW - Grey GREY - Yellow
21 VIOLET - Blue BLUE - Violet
22 VIOLET - Orange ORANGE - Violet
23 VIOLET - Green GREEN - Violet
24 VIOLET - Brown BROWN - Violet
25 VIOLET - Grey GREY - Violet
In cables made up from 20-pair units, the first unit in each cable layer
is lapped with an ORANGE tape, the last unit is lapped with GREEN.
| BACK | Home page | BT/GPO Telephones | A - Z Index | Glossary of Telecom Terminology | Quick Find | All Telephone Systems |
FM