The 20-pair colour code is a colour code used in Australia to identify individual conductors in a kind of electrical telecommunication wiring for indoor use, known as twisted pair cables. The colours are applied to the insulation that covers each conductor. The first colour is chosen from one group of five colours.

The combinations are also shown in the table below showing the colour for each wire ("1" and "2") and the pair number.

1-2021-4041-6061-8081-100
Pair #First wire/ A Leg (L+)Second wire/ B Leg (L-)Pair #First wire/ A Leg (L+)Second wire/ B Leg (L-)Pair #First wire/ A Leg (L+)Second wire/ B Leg (L-)Pair #First wire/ A Leg (L+)Second wire/ B Leg (L-)Pair #First wire/ A Leg (L+)Second wire/ B Leg (L-)
1 White Blue21 Yellow Blue41 Black Blue61 Violet Blue81 Red Blue
2 Orange22 Orange42 Orange62 Orange82 Orange
3 Green23 Green43 Green63 Green83 Green
4 Brown24 Brown44 Brown64 Brown84 Brown
5 Grey25 Grey45 Grey 65 Grey 85 Grey
6 Blue-White26 Blue-White46 Blue-White66 Blue-White86 Blue-White
7 Blue-Orange27 Blue-Orange47 Blue-Orange67 Blue-Orange87 Blue-Orange
8 Blue-Green28 Blue-Green48 Blue-Green68 Blue-Green88 Blue-Green
9 Blue-Brown29 Blue-Brown49 Blue-Brown69 Blue-Brown89 Blue-Brown
10 Blue-Grey30 Blue-Grey50 Blue-Grey70 Blue-Grey90 Blue-Grey
11 Orange-White31 Orange-White51 Orange-White71 Orange-White91 Orange-White
12 Orange-Green32 Orange-Green52 Orange-Green72 Orange-Green92 Orange-Green
13 Orange-Brown33 Orange-Brown53 Orange-Brown73 Orange-Brown93 Orange-Brown
14 Orange-Grey34 Orange-Grey54 Orange-Grey74 Orange-Grey94 Orange-Grey
15 Green-White35 Green-White55 Green-White75 Green-White95 Green-White
16 Green-Brown36 Green-Brown56 Green-Brown76 Green-Brown96 Green-Brown
17 Green-Grey37 Green-Grey57 Green-Grey77 Green-Grey97 Green-Grey
18 Brown-White38 Brown-White58 Brown-White78 Brown-White98 Brown-White
19 Brown-Grey39 Brown-Grey59 Brown-Grey79 Brown-Grey99 Brown-Grey
20 Grey-White40 Grey-White60 Grey-White80 Grey-White100 Grey-White

The Australian standard specifies "Grey" in Tables B2 to B7. There are systems in other countries where "Slate" is used rather than "Grey". This is perceived as a minimisation of confusion between "Green" and "Grey" and their potential abbreviations: "G", "Gr", or "Gre". No such consideration is made for "Black", "Blue", or "Brown", or their potential abbreviations of "B", "Bl", or "Br".

Sources

  • www.commsalliance.com.au

See also

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