Multiplex communications – Wide area network – Packet switching
Patent
1983-06-22
1985-10-29
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701101, H04J 1104, H04J 312
Patent
active
045503982
ABSTRACT:
An automatic exchange of a telephone system comprises a PCM switching network with a plurality of cascaded stages for establishing temporal and spatial connections between incoming channels on input lines of the first stage and outgoing channels on output lines of the last stage in response to commands from external controllers dialoguing with internal controllers of the network. Pairs of switching matrices forming part of nonadjacent stages are combined into modular switching units each provided with its own internal controller. Routing instructions are transmitted from an external controller to a first internal controller which selects a signal path through the matrices of its own switching unit and informs a second internal controller of that selection whereupon the latter extends the path through an adjoining switching unit, and so on until the connection is completed. With digital message words such as speech bytes traveling in a forward direction from the input side to the output side of the network, the instruction words pertaining thereto move in the opposite direction over the same interstage links; the two paths are mutually conjugate within each switching unit, their matrices being bypassed by the routing instructions.
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LSI Components for Digital Line Stages by Melindo et al., presented International Switching Symposium, Sep. 21-25, 1981, Montreal, Canada.
"Corrective Maintenance in the Integrated PCM Telecommunications System IFS-1", by K. E. Wurhmann, presented at the International Switching Symposium, Oct. 25-29, 1976, Kyoto, Japan.
"A Subscriber Carrier Terminal Interface for an Integrated Digital Switching System", by Carl Easton, presented at the International Symposium on Subscriber Loops and Services, Sep. 15-19, 1980, Berlin.
Time-Division Distributed Switching System by Akiyama et al., presented at the International Switching Symposium, Sep. 21-25, 1981, Montreal, Canada.
Belforte Piero
Garetti Enzo
Pilati Luciano
CSELT - Centro Studi e Laboratori Telecomunicazioni S.P.A.
Dubno Herbert
Olms Douglas W.
Ross Karl F.
Scutch III Frank M.
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