| 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.