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TDMA communication system having common local path medium and local time slot for intraoffice calls

  • US 4,759,016 A
  • Filed: 05/04/1987
  • Issued: 07/19/1988
  • Est. Priority Date: 05/09/1986
  • Status: Expired due to Term
First Claim
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1. A multiple access communication system having a central station and a terminal station, said terminal station serving a plurality of subscriber stations, said central station and said terminal station exchanging downstream and upstream time-division multiplexed (TDM) signals over first commcn path medium, comprising:

  • first control means in said central station for determining first and second time slots in each of said upstream and downstream TDM signals in response to a call-processing signal, establishing a connection between said first and second time slots of each TDM signal and transmitting a control signal to said terminal station;

    time-division multiple access interface circuits associated respectively with said subscriber stations and normally coupled to said first common path medium for transmitting said upstream TDM signal and receiving said downstream TDM signal;

    second control means associated with said interface circuits for transmitting said call-processing signal to said first control means when a call is to be established between two of said interface circuits;

    second common path medium;

    switch means responsive to said control signal for switching said two interface circuits from said first common path medium to said second common path medium; and

    time slot control means for respectively coupling said two interface circuits to said first and second time slots of each TDM signal and responsive to said control signal for determining a third time slot and switching said two interface circuits from said first and second time slots to said third time slot.

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