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Transmission line break detecting circuit

  • US 3,288,929 A
  • Filed: 06/21/1965
  • Issued: 11/29/1966
  • Est. Priority Date: 06/21/1965
  • Status: Expired due to Term
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1. IN AN ELECTRICAL DATA TRANSMISSION SYSTEM, A TRANSMISSION LINE BREAK DETECTING CIRCUIT COMPRISING:

  • (A) A SIGNAL GENERATOR, RESPONSIVE TO A DATA SOURCE FOR GENERATING ELECTRICAL SIGNALS REPRESENTING THE DATA;

    (B) A TRANSMISSION LINE;

    (C) A TRANSMITTER, INCLUDING A SILICON CONTROLLED RECTIFIER RESPONSIVE TO THE SIGNAL GENERATOR FOR TRANSMITTING THE ELECTRIAL SIGNALS TO THE TRANSMISSION LINE;

    AND (D) A COMPARATOR, CONNECTED TO THE SIGNAL GENERATOR AND TO THE TRANSMISSION LINE, ARRANGED TO COMPARE THE ELECTRICAL SIGNALS FROM THE SIGNAL GENERATOR AND FROM THE TRANSMISSION LINE, AND TO GENERATE A COMPARTOR OUTPUT SIGNAL IF THE ELECTRICAL SIGNALS ARE DEFFERENT WHEN NO CURRENT IS FLOWING IN THE TRANSMISSION LINE.

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