Saturday, 4th February 2012

BT Socket -> RJ45

Allows normal UK telephone to be connected to RJ45 sockets
Available as either BT Master, or Secondary

These adaptors allow a house wired with CAT5/RJ45 outlets to have standard UK telephones connected. The Master adaptor would be used in place of the BT Master. The Master contains extra electronics which allows the telephones to ring. The Secondary (which is probably the most likely adaptor you'll need) is used as any Secondary output in a normal house.

The Secondary is wired:

RJ45 Plug (on External Cable)	RJ45 Socket (on Adaptor)	BT Socket (On Adaptor)	BT Plug (On External Cable)
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