Subscriber's relocating circuit for telephone exchange - blocks subscriber line and reroutes calls initiated by subscriber through temporarily installed exchange terminal appts.

摘要

The additional circuit can be applied where, e.g. a subscriber is moving house but the actual removal date cannot be accurately determined beforehand. The circuit (B), which can be plugged in at the exchange, comprises a receiver unit (E), a comparator (AW) and a memory (SP). The memory contains a single predetermined number. The circuit output controls relay coils (X,U) which operate change over contacts between the subscriber line (TAL), the exchange side (LW) of the line, and a special service (CN). The subscriber connection functions normally with the circuit installed. When the subscriber decides that his line should now be blocked for future incoming calls he dialls the preset number. This selection is detected (AW) and the relays energised to connect the exchange side of the subscriber line (LW) to the special service (SN). Any caller then hears a recorded message, e.g. the new number to call.