| 摘要 |
A central memory in a telephone exchange contains, in storage sections assigned to individual subscribers, binary words representing the current balances of their respective accounts together with possible classification information. An input multiple, whose leads are selectively energizable by a line finder in the presence of an incoming call, address the storage section assigned to the calling subscriber and, in the case of the subscribers within a predetermined class, concurrently transmits an identification of this subscriber to a code register via a buffer register under the control of a classification unit. The input multiple also receives, in the case of a toll call, counting pulses from a called subscriber to indicate the amount of the toll to be debited to the calling subscriber, each containing pulse causing the contents of the addressed storage section to be read out and promptly reinscribed after augmentation by one unit; read-out or augmentation in inhibited whenever the energization of the input multiple is due to an interrogation pulse occurring upon seizure of the register. A retrieval unit associated with the memory controls the classification unit and can also be operated, with inhibition of augmentation, for auditing and reclassification purposes.
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