Circuit processing criteria in telephone exchange - evaluates stored subscriber time marks and subscriber call state information in logic circuit for controlling call current connection

摘要

The criteria appear at subscriber lines. The exchange has a device cyclically scanning the subscriber lines and receiving their signals. This device stores the signals in storage locations of a store allocated to the line just scanned. The store has further storage locations storing the time marks necessary for evaluation of the connection states and dialling signals. Signals giving the calling state of a subscriber and time marks stored for this subscriber are evaluated by a logic circuit for connecting the calling current to the respective subscriber line.