H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/29
H04Q 3/54 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 1101530
Cox-Treiber-Cotton, 12-2-2 DISTRIBUTED CONTROL FOR DIGITAL SWITCHING SYSTEM Abstract of the Disclosure A uniformly manufacturable solid state modular distributed control for a digitally switched local or central office servicing an expandable number of subscribers is disclosed in which subscriber lines and trunks communicate through a standardized hardware interface to a group switch. The described system provides individual microprocessor per call control, with software distributed in accordance with the class of service per line, without the limitations of stored program control systems, but expandable without adverse affect on existing software. Switching control signals are communicated to and from the subscriber subsets to the group switch over the same paths which couple the speech signals thereto, thereby eliminating cumbersome and expensive separate control paths. In accordance with a further aspect of the present invention, subscriber calls are divided into originating and terminating call halves, under subscriber control and separated by the group switch, thereby eliminating undesired interaction therebetween to provide for simplified software requirements.
297987
Cotton John M.
Cox John E.
Treiber Robert
International Standard Electric Corporation
Smart & Biggar
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