This is a BT telephone to RJ45 Adapter converter coupler 2-Wire socket with tailed cable. Enabling telecoms equipment with a UK (BT) type plug to be used on RJ45 structured wiring systems that are now commonly used in offices and public buildings.
The most commonly used is the two-wire version listed here as many telephones only use 2 wires for connection. It is sometimes referred to as Master Adaptor.
UK (BT) type plug to RJ45 socket.
2 Wire version most commonly used.
Commonly used to to connect telephones to RJ45 structured wiring systems.
Tailed dongle type adaptor.
Adaptor with cable.
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