BT telephone socket wiring

Conn No.	Usual Cable Colour	Carries
1	N/A	No connection
2	Blue with White Bands	Speech and Ringing
3	Orange with White Bands	Ringing
4	White with Orange Bands	Not used but usually connected for neatness
5	White with Blue Bands	Speech and Ringing
6	N/A	No connection

Be warned however that the above colour codes may not have been followed

The top drawing is also a little incorrect.

BT's leg A connects to terminal 5, and leg B to terminal 2. This was due to a design/manufacturing error…….not that it makes too much odds, 99% of devices will work with either polarity.

Also, terminal 4 is best connected on extensions when two lines share the same cable - it prevents cross talk, and prevents the possibilty of the second lines phones tinkling when the other line rings.

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BT telephone socket wiring

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