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Fault locating system for optical telecommunications

  • US 4,184,056 A
  • Filed: 10/05/1978
  • Issued: 01/15/1980
  • Est. Priority Date: 10/05/1978
  • Status: Expired due to Term
First Claim
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1. In combination,a central office;

  • means associated with said central office for generating a tone signal;

    analog to digital conversion means for converting said tone signal to a unipolar digital signal;

    cable driving means for receiving said digital signal and for providing an output for driving an optical cable;

    a first optical cable having an input coupled to the output of said cable driving means, and an output;

    a first filter, having an input and an output, for passing signals at a frequency f1 ;

    a first repeater having an input coupled to the output of said first optical cable for reforming the received digital signal before retransmission thereof, said first repeater being coupled to said input of said first filter;

    a secod optical cable having an input coupled to an output of said first repeater, and an output;

    a second filter, having an input and an output, for passing signals at a frequency f2 ;

    a second repeater having an input coupled to the output of said second optical cable for reforming the received digital signal before retransmission thereof, said second repeater being coupled to said input of said second filter;

    an nth optical cable having an input coupled to an output of the (n-1)st repeater, and an output;

    an nth filter, having an input and an output, for passing signals at a frequency fn ;

    an nth repeater having an input coupled to the output of the nth optical cable for reforming the received digital signal before retransmission thereof, said nth repeater being coupled to said input of said nth filter; and

    a pair of wires coupling the outputs of said filters to said central office;

    wherein n is an integer greater than 2.

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