Subscribers' Connection Units (S.C.U.)

Abstract

We have signalled their importance in an ensemble of equipments of an electronic telephone exchange where these units occupy the majority of cabinets. The jobs of S.C.U are the protection of the exchange from the dangerous external disturbances. Every subscriber line passes through a protection module. The connection of power supply to the subscriber line through S.L.I.C (subscriber line interface circuits) or BORISH.