H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/6
H04Q 3/74 (2006.01) H04M 15/36 (2006.01)
Patent
CA 1094670
PATENT APPLICATION INVENTOR: ROGER ATKINSON TITLE: IDENTIFIER CIRCUIT FOR IDENTIFYING PARTY LINE SUBSCRIBERS ABSTRACT OF THE DISCLOSURE An identifier circuit for connection between a tele- phone system party line and a party line subscriber to permit identification of a calling party line subscriber with auto- matic number identifying equipment at a central office. The identifier circuit includes a pair of terminals adapted to be selectively connected to ground in accordance with identifica- tion of a particular party line subscriber, a pair of normally nonconductive test transistors each connected between one of the terminals and one of the leads of the party line, a pair of control transistors responsive to voltage on the party line to maintain the test transistors nonconductive and responsive to removal of the party line voltage to permit the test trans- istors to conduct, and a pair of capacitors charged when a calling subscriber goes off hook and discharged to maintain the test transistors conductive for a predetermined time during which testing of the party line to identify the calling sub- scriber can be accomplished with automatic number identifying equipment at the central office.
295368
Hewson Donald E.
Itec Inc.
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