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Local area communication system for integrated services based on a token-ring transmission medium

  • US 4,843,606 A
  • Filed: 12/03/1986
  • Issued: 06/27/1989
  • Est. Priority Date: 12/23/1985
  • Status: Expired due to Term
First Claim
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1. A communications system having at least one transmission facility in which data are transmitted in asynchronously circulating frames, in which access to said at least one transmission facility is regulated by a token, and in which a priority token for marking a priority frame is released at quasi-regular intervals by a synchronous bandwidth manager (SBM) unit provided for said at least one transmission facility,characterized in that for transmission and switching of information blocks requiring synchronous transfer:

  • a common time division multiplex (TDM) switching unit is provided and is connected to the transmission facility by a SBM unit (57);

    saidSBM unit includes means (61 . . . 73, 79 . . .

         89) for extracting all information blocks from each priority frame and for inserting them into buffers (75) readable by said TDM switching unit, and for extracting information blocks from buffers (77) writable from said TDM switching unit and inserting them into priority frames it transmits on its associated transmission facility, each said priority frame having a plurality of time slots (V1 . . . Vn) for information blocks; and

    thateach station which participates in the exchange of information blocks requiring synchronous transfer, has means (101 . . .

         109) for receiving such an information block from, and transmitting such an information block in, at least one predetermined slot of each said priority frame.

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