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Telephone Wiring Standards


by Jeff Fisher

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/BrownBrown/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.

Jack Lead Colors

Jack Lead Colors
Pin #Jack Type
8P8C
8P8C Keyed
6P6CMMJ
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)--

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 category 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:

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

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Jeff

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