Telephone exchange special subscriber circuit identifier - using code generator forming individual identification signal for conversion into call number

摘要

The identification circuit has each special service subscriber circuit (SDTS) provided with a code generator (KG) sending an individual identifier. The service station (FA) has a device (E) to receive the identifier. The data processing system (DVA) converts the identifier into the subscriber call number. The code generator has an MFV transmitter and the service station an appropriate receiver. The identifiers each consist of a subscriber address and an exchange address and each is held in a plug-in permanent storage device.