Multiplex communications – Wide area network – Packet switching
Patent
1983-06-22
1985-09-24
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701101, H04J 1104, H04J 312
Patent
active
045436533
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 ito 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. Each matrix is provided with a data store which is asynchronously loadable from the associated internal controller with a routing instruction to be synchronously forwarded, in a special time slot dedicated to intercontroller dialoguing in a PCM group to which the instruction pertains, to the data store of a coacting matrix in the next stage for asynchronous retransmission to the controller thereof; each data store may be paired with a respective series/parallel converter coupling it to the associated matrix for serially loading that store in any PCM frame with the contents of the dedicated channels of concurrently arriving PCM groups and feeding stored instruction words in parallel to the output lines of the matrix during a predetermined time slot of each frame. The internal controllers also perform diagnostic operations by comparing bytes extracted from an established signal path at locations upstream and downstream of a matrix.
REFERENCES:
patent: 3920914 (1975-11-01), Regnier et al.
patent: 3983330 (1976-09-01), Tongi
patent: 3991276 (1976-11-01), Regnier et al.
patent: 4035584 (1977-07-01), Lurtz
patent: 4142068 (1979-02-01), Charransol et al.
Proteo System: An Overview by Galimberti et al., International Switching Symposium, Sep. 21-25, 1981, Montreal, Canada.
LSI Components for Digital Line Stages by Melindo et al., Presented at International Switching Symposium, Sep. 21-25, 1981, Montreal, Canada.
The E10.S-TSS.5 A Multipurpose Digital Switching System by Ballard Presented at the International Switching Symposium, Sep. 21-25, 1981, Montreal, Canada.
Time-Division Distributed Switching System by Akiyama et al., Presented at the International Switching Symposium, Sep. 21-25, 1981, Montreal, Canada.
Belforte Piero
Bondonno Mario
Bostica Bruno
Pilati Luciano
CSELT-Centro Studi E Laboratori Telecommunicazioni S.p.A.
Dubno Herbert
Olms Douglas W.
Ross Karl F.
Scutch III Frank M.
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