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Time division switching system for circuit mode and packet mode channels

  • US 4,494,231 A
  • Filed: 01/15/1982
  • Issued: 01/15/1985
  • Est. Priority Date: 01/23/1981
  • Status: Expired due to Fees
First Claim
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1. A time division digital switching system for switching channels with a predetermined rate, said channel having circuit mode channels and packet mode channels conveying useful information words with a predetermined number of bits, said system comprising:

  • G first multiplexing means, each multiplexing a group of I reception channels into an outgoing multiplexed signal, G first demultiplexing means each demultiplexing an incoming multiplexed signal into a group of I emission channels, of said multiplexed signals having a recurrent frame including I useful information words assigned to said multiplexed channels, where G and I are integers greater than one; and

    means for bidirectionally switching said circuit mode channels and said packet mode channels between lines carrying said incoming and outgoing multiplexed signals;

    each of said first multiplexing means comprising;

    means for introducing working information words into predetermined time intervals, each of the information words defining a multiframe and being included in one of I consecutive frames of said outgoing multiplexed signal words, each of said information words having said predetermined number of bits respectively assigned to said I reception channels, said incoming multiplexed signals also conveying said frames and multiframes; and

    means for detecting flag/packet transitions in said packet mode reception channels to replace the working information word by a flag/packet transition indicating word in a frame of said outgoing multiplexed signal having the same rank in the multiframe as that in said packet mode reception channel in which a flag/packet transition has been detected;

    said switching means comprising means receiving the working information words multiplexed in the multiframes of said outgoing multiplexed signals for detecting the transition indicating word to switch the channel having a detected transition over to a free packet mode channel in an incoming multiplexed signal.

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