Telephone Cables | ||||||||||||
Colour Codes & Cable Make Up
Identification of basic sub-units, construction of 50 and 100 pair units, and cable cores of up to 100 pairs
20 pairs 30 pairs 50 pairs 70 pairs 100 pairs
Identification of basic units and cable core constructions for cables of more than 100 pairs - Numbered units
150 pairs (3 x 50p) 200 pairs (4 x 50p) 300 pairs (6 x 50p) 400 pairs (8 x 50p)
500 pairs (5 x 100p) 600 pairs (6 x 100p) 800 pairs (8 x 100p) 900 pairs (9 x 100p)
1000 pairs (10 x 100p) 1200 pairs (12 x 100p) 1500 pairs (15 x 100p) 1800 pairs (18 x 100p)
2100 pairs (21 x 100p) 2400 pairs (24 x 100p) 2700 pairs (27 x 100p) 3000 pairs (30 x 100p)
G) Colour Code & Cable Make Up According to GR-421, ICEA S-85-625 & ICEA S-84-608
Pair Identification Colours
For pairs numbering 1 through 25, the pair identification colours are outlined below. In cable constructions containing more than 25 pairs, the colours are repeated as necessary. Colour coded binders are used to identify 25 pair groups of colour coded pairs.
Pair Number |
Tip Colour |
Ring Colour |
Pair Number |
Tip Colour |
Ring Colour |
1 |
WHITE |
BLUE |
13 |
BLACK |
GREEN |
2 |
WHITE |
ORANGE |
14 |
BLACK |
BROWN |
3 |
WHITE |
GREEN |
15 |
BLACK |
GREY |
4 |
WHITE |
BROWN |
16 |
YELLOW |
BLUE |
5 |
WHITE |
GREY |
17 |
YELLOW |
ORANGE |
6 |
RED |
BLUE |
18 |
YELLOW |
GREEN |
7 |
RED |
ORANGE |
19 |
YELLOW |
BROWN |
8 |
RED |
GREEN |
20 |
YELLOW |
GREY |
9 |
RED |
BROWN |
21 |
VIOLET |
BLUE |
10 |
RED |
GREY |
22 |
VIOLET |
ORANGE |
11 |
BLACK |
BLUE |
23 |
VIOLET |
GREEN |
12 |
BLACK |
ORANGE |
24 |
VIOLET |
BROWN |
|
|
|
25 |
VIOLET |
GREY |
Identification of Groups of Pairs
For cables through 600 pairs, 25 pair groups are identified by their binder colours in the same sequence as the pair identification is accomplished. Group 1 has White-Blue binders. Group 2 has White-Orange binders, etc. In this manner, each pair is uniquely identified. In cables having 25 pairs or less, binders are normally not used. However, if specified, the binders will be Group 1, White-Blue. For cables of 100 pairs or less, the use of the White binder is optional.
Group Number |
Group Pair |
Colour of Binders |
Group |
Group Pair |
Colour of Binders |
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1 | 1-25 |
WHITE |
BLUE |
13 |
301-325 |
BLACK |
GREEN |
2 | 26-50 |
WHITE |
ORANGE |
14 |
326-350 |
BLACK |
BROWN |
3 | 51-75 |
WHITE |
GREEN |
15 |
351-375 |
BLACK |
GREY |
4 | 76-100 |
WHITE |
BROWN |
16 |
376-400 |
YELLOW |
BLUE |
5 | 101-125 |
WHITE |
GREY |
17 |
401-425 |
YELLOW |
ORANGE |
6 | 126-150 |
RED |
BLUE |
18 |
426-450 |
YELLOW |
GREEN |
7 | 151-175 |
RED |
ORANGE |
19 |
451-475 |
YELLOW |
BROWN |
8 | 176-200 |
RED |
GREEN |
20 |
476-500 |
YELLOW |
GREY |
9 | 201-225 |
RED |
BROWN |
21 |
501-525 |
VIOLET |
BLUE |
10 | 226-250 |
RED |
GREY |
22 |
526-550 |
VIOLET |
ORANGE |
11 | 251-275 |
BLACK |
BLUE |
23 |
551-575 |
VIOLET |
GREEN |
12 | 276-300 |
BLACK |
ORANGE |
24 |
576-600 |
VIOLET |
BROWN |
Super-units Binder Identification Colours
It is desirable for manufacturing purposes to combine four 25 pair groups into “super units” when cables have 900 pairs or more.
Pair Number |
Group Number |
Binder Colour |
1-600 |
1-24 |
WHITE |
601-1200 |
25-48 |
RED |
1201-1800 | 49-72 |
BLACK |
1801-2400 | 73-96 |
YELLOW |
2401-3000 | 97-120 |
VIOLET |
3001-3600 | 121-144 |
BLUE |
3601-4200 | 145-168 |
ORANGE |
Standard Telephone Cable
Various arrangements of pairs, units, groups, and super units are possible for standard non-screened telephone cables both filled and aircore.
The following constructions illustrate the lay-ups normally provided. Cables containing 1200 pairs or more are also available with mirror image core constructions as shown.
Unit Assemblies (Units or U) Group Assemblies (Group or G)
Super Units Assemblies (Super Units or SU)