Multiplex communications – Wide area network – Packet switching
Patent
1982-04-22
1985-04-23
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
H04J 314
Patent
active
045134146
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.
The second processor is used to select which of a plurality of sources may be used to provide clock signals within the line switch module.
REFERENCES:
patent: 3828136 (1974-08-01), Perna et al.
patent: 4144448 (1979-03-01), Pisciotta et al.
patent: 4256926 (1981-03-01), Pitroda et al.
patent: 4276637 (1981-06-01), Le Dieu
M. Esperseth et al, "GTD-5 EAX, A Family of Digital Switches", GTE Automatic Electric Journal, Sep. 1979, pp. 150-154.
S. Anderes et al, "GTD-5 EAX--Digital Remote Units", GTE Automatic Electric Journal, Jan.-Feb. 1981, pp. 8-15.
Knapke Paul H.
Miller Robert L.
Chin Wellington
International Telephone and Telegraph Corporation
Meagher Thomas F.
Morris Jeffrey P.
O'Halloran John T.
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