CDL Full Master PSTN Adapter

The CMS Cables Full Master PSTN Leaded Telephone Adapter (BT-500) is a specialised converter designed to integrate standard UK analogue telephone equipment into modern RJ45 structured cabling systems. It features a male RJ45 (8P8C) plug on a flexible flying lead that connects directly to a data socket, converting it into a standard BT (631A) female voice outlet. As a Full Master unit, it is equipped with an internal ringing capacitor and high-voltage surge arrestor to ensure analogue phones ring correctly and remain protected. The adapter is constructed with a durable white ABS shell and high-quality bronze contacts to maintain reliable, oxidation-free connectivity. It is primarily used in office or home environments to support fax machines, modems, and telephones on direct lines not routed through a PABX system.