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// Telecom Connectors

BT Plug UK Telephone

The BT431A is the UK telephone connector for telephone and ADSL connections. Pins 2 and 5 carry the primary phone line. Not compatible with RJ11 without an adapter.

// Specifications
Standard
BT 631A BS 6312
Primary Pair
Pin 2 A wire and Pin 5 B wire
Use Case
UK telephone sockets, DSL modems
Region
United Kingdom
// Pin Reference Table
Pin Name Function Type
1 Spare Unused I/O
2 A Wire Phone line A tip BUS
3 Spare Unused I/O
4 Spare Unused I/O
5 B Wire Phone line B ring BUS
6 Spare Unused I/O