Cat 5 to LJU wiring for BT phones

The Secondary is wired:

RJ45 Plug
(on External Cable)
RJ45 Socket
(on Adaptor)
BT Socket
(On Adaptor)
BT Plug
(On External Cable)
Function
1 1 4 3 Recall
2 2 3 4 Ring
3 3 6 1
4 4 2 5 B Leg
5 5 5 2 A Leg
6 6 1 6
7 7 - -
8 8 - -

Generally you only require the A Leg and B Leg Wires.
A BT Socket, and BT Plug's Pin Designations are reversed. So the socket is designated Pin 1, but the plug is Pin 6


rb/cat5tolju.txt · Last modified: 16/03/2018 11:05 by andrew