Power system for telephone systems with street cabinets connected to terminals and to an exchange.

摘要

The invention concerns a telephony system in which a plurality of local network terminations (8) are connected to a street cabinet (3) in turn connected to an exchange (1), the street cabinet (2) having a power supply (21) for supplying power and a master ringing signal to each of the local network terminations. The power supply comprises a rectifier (21) for rectifying A.C. mains (7) and one output of the rectifier (21) is connected to a battery (22) to provide back up in the event of power failure.