BBC UN10/62 Telephone Divert Unit, 1985.

The Telephone Divert Unit replaced the BT telephone divert facilities not available on newer phones. It is a self-contained, stand-alone unit, powered from studio supplies. The unit is suitable for both NCA and Network Studios. The unit is designed to be pluggable into a new type telephone Line Jack Unit. Any type telephone can be plugged into it on a Line Jack socket at the back. Incoming telephone calls can be answered via the telephone instrument, or automatically by the unit (by its in-built ringing detector). All external circuits are opto-isolated and appear on a varicon fixed plug on the rear unit. Power requirements 50 V, approx. 560 mA. At 24 V, approx. 360 mA. At 12 V, approx. 250 mA.