Multiplex communications – Wide area network – Packet switching
Patent
1979-07-12
1982-03-02
Brown, Thomas W.
Multiplex communications
Wide area network
Packet switching
370 58, 3701101, H04J 312, H04Q 354, H04Q 1104
Patent
active
043179622
ABSTRACT:
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 microprocessor control of each call, with software distributed in accordance with the class of service per line, without the limitations of centralized 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 orginating and terminating call halves, under subscriber control and separated by the group switch, thereby eliminating undesired interaction therebetween to provide for simplified software requirements.
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Cotton John M.
Cox John E.
Treiber Robert
Brown Thomas W.
International Telephone and Telegraph Corporation
Morris Jeffrey P.
O'Halloran John T.
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