SCHALTUNGSANORDNUNG FUER FERNSPRECHENDGERAETE

摘要

Telephone terminal stations are connected via network terminating unit to an integrated services digital communications network. When there is power supply failure in the terminating unit, a circuit controls supply to the terminal station from the exchange so that, in the passive state, the power consumption of the telephone terminal station is reduced to a minimum. To this purpose, the voltage for internal users of the telephone terminal station is switched off and only switched on again in the active state, i.e. with transmitting or receiving occupation or operation. <IMAGE>