Multiplex communications – Wide area network – Packet switching
Patent
1982-04-22
1984-12-25
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370100, H04J 302
Patent
active
044908199
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.
The bus arrangement operates at a data rate higher than that of the PCM lines. A rate converter serves to interface two PCM lines to an internal PCM bus by interleaving channels from the two PCM lines onto the PCM bus and by further providing an additional control channel on the PCM bus. The rate converter further serves to demultiplex channels from the PCM bus onto the PCM lines.
REFERENCES:
patent: 3982074 (1976-09-01), Clark
patent: 4058682 (1977-11-01), Delle Donne et al.
patent: 4229815 (1980-10-01), Cummiskey
patent: 4313198 (1982-01-01), Mazzocchi
patent: 4322844 (1982-03-01), Fellinger et al.
patent: 4402079 (1983-08-01), Fellinger et al.
Bogan Leonard E.
Knapke Paul H.
Miller Robert L.
Chin Wellington
Hill Alfred C.
International Telephone and Telegraph Corporation
Morris Jeffrey P.
O'Halloran John T.
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