Peripheral disconnecting circuit for telephone exchange - has central capacitor actuating peripheral disconnect relay

摘要

The disconnecting circuit, for peripherals for telephone exchanges, has a diode (D2) connected into the alerting line (AL) in the direction of the alerting current. This diode is located in the peripheral unit (PG) and is shunted by a disconnect relay (L) in series with an oppositely-poled second diode (D3). A capacitor (C) in the central unit (ZG) acts as the source of the disconnect current and is connected by an auxiliary relay changeover contacts to the disconnect relay in the peripheral when the auxiliary relay receives a disconnect instruction.