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Telephone Wiring Standards

This page describes how to wire various kinds of telephone jacks.


Wire Color Codes

Standard Quad-Wire
Color codes
Pair 1T
R
Green
Red
Pair 2T
R
Black
Yellow
NOTE:Presented for historical reasons-
nobody uses quad wire anymore.

Standard 4-Pair Wiring
Color codes
Pair 1T
R
White/Blue
Blue/White
Pair 2T
R
White/Orange
Orange/White
Pair 3T
R
White/Green
Green/White
Pair 4T
R
White/Brown
Brown/White
NOTE:For 6-wire jacks use pair 1, 2 and 3 color codes.
For 4-wire jacks use pair 1 and 2 color codes.

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Jack Lead Colors

Jack Lead Colors
Pin # Jack Type
8P8C/
8P8C Keyed
6P6C MMJ
1Blue(L)White(W)Orange(O)
2Orange(O)Black(B)Green(G)
3Black(B)Red(R)Red(R)
4Red(R)Green(G)Yellow(Y)
5Green(G)Yellow(Y)Black(B)
6Yellow(Y)Blue(L)Brown(N)
7Brown(N)--
8White(W)--

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Standard Jack Wiring





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Non-Standard Jack Wiring

The following wiring schemes are non-standard and violate category 5 ratings...but if you only have a single catecory 5 cable in the wall, you can wire it to the jacks in one of two ways to still have telephone and network connections.

This is how to wire one cat 5 cable into a network and a two-line jack:

This is how to wire one cat 5 cable into a network and two one-line jacks:


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