Communication network

Abstract

Abstract A communication network is proposed in which communication devices are connected via enabling devices to a central office. The enabling device is operated by a prepaid card (15) on which charge units are stored which are booked successively by charge pulses supplied from the central office. To ensure that premature withdrawal of the card from the enabling device (13) does not result in loss of a charge unit that cannot then be booked, immediately after insertion of the card in the enabling device and initiation of the call by a user of the communication device (12) an additional charge unit is booked from the prepaid card. If the call ends properly, this additional charge unit is credited back to the prepaid card. If the card is prematurely withdrawn this additional charge unit is retained. (Figure) <IMAGE>

Inventors

• 👤 Jürgen Dr.-Ing. Wazeck

Bibliographic Details