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Digital signal transmitting system

  • US 4,710,921 A
  • Filed: 07/05/1985
  • Issued: 12/01/1987
  • Est. Priority Date: 07/05/1985
  • Status: Expired due to Term
First Claim
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1. A digital signal transmitting system comprising:

  • a digital signal generator for producing digital information signals;

    a control signal generator for producing a frame synchronizing signal and service bit signal;

    time division-multiplexing means for producing a composite digital signal including said frame synchronizing signal, service bit signals and digital information signals, said service bit signals being arranged for continuously transmitting first and second control signals representing a terminal number and a scramble key code, respectively, in alternate frames of the composite digital signal; and

    means modulating said composite digital signal on a carrier for transmission thereby through a transmission line.

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