Trunk interface circuit

Details Trunk interface circuit Trunk interface circuit

H - Electricity

04

Q

344/29

H04Q 3/54 (2006.01) H04M 15/04 (2006.01)

Patent

CA 1134931

ANDERSON E S 3-3 TRUNK INTERFACE CIRCUIT Abstract of the Disclosure A trunk interface circuit is disclosed for executing communication and signaling functions associated with telephone calls between subscriber stations of separate telecommunication systems. A semiautonomous control circuit is responsive to state signals generated by a central control circuit for establishing the trunk interface circuit in a plurality of states. The semiautonomous control circuit comprises a memory having predetermined data stored therein corresponding to each of the plurality of states. A processor within the semiautonomous control circuit executes certain of the communication and signaling functions as determined by the stored data corresponding to the present state of the trunk interface circuit. The communication functions comprise reception of periodic charging pulses from a distant office and subsequent transmittal of signals to the central control circuit representative of the charging pulses.

355660

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