Multiplex communications – Wide area network – Packet switching
Patent
1982-04-22
1985-07-02
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 85, H04J 302, H04Q 1104
Patent
active
045272662
ABSTRACT:
A line switch for a digital telephone switching system utilizes distributed processing. The line switch comprises one or more switch modules. Each switch module is coupled to a central office switching system via one or more PCM lines which utilize common channel signaling. Each switch module comprises groups of line circuits, each line circuit being coupled to a subscriber line. Three separate distributed processor functions are provided in each line switch module. A first processor is utilized to communicate with the central office switching system and to coordinate the operations within the line switch module. A second processor is provided to control clock generation and rate conversion circuits. Each group of line circuits includes a third processor to control the operations of the line circuits and to gather information from the line circuit. A busing arrangement is provided within the line switch such that both control information and PCM voice data are routed throughout the line switch.
Communication between all the processors is via common buses carrying time division multiplexed PCM data and control data. A standardized interface between each processor and the time-division multiplexed buses is provided.
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Bogan Leonard E.
Hamersley Richard A.
Chin Wellington
International Telephone and Telegraph Corporation
Morris Jeffrey P.
O'Halloran John T.
Olms Douglas W.
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