H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
379/33, 344/37,
H04Q 3/52 (2006.01) H04M 9/00 (2006.01)
Patent
CA 1129529
Abstract of the Disclosure In a key telephone system including an electronic speech channel switching network and an electronic key tele- phone set selectively connected to central office lines by the speech channel switching network, the speech channel switching network is constituted by a pair of incoming lines connected to a pair of central office lines and a plurality of pairs of outgoing lines connected to the key telephone set. The incom- ing and outgoing lines are arranged in a matrix, and a plu- rality of controllable unidirectional switching elements are disposed respectively at four cross-points between the incoming and outgoing lines. Each switching element is connected op- positely with respect to one incoming line and to one outgoing line which comprise a pair.
337670
Ohkoshi Seiei
Yamamoto Kazuyuki
Macrae & Co.
Nippon Telegraph & Telephone Public Corporation
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