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Distribution network power line carrier communication system

  • US 3,911,415 A
  • Filed: 10/31/1974
  • Issued: 10/07/1975
  • Est. Priority Date: 12/18/1973
  • Status: Expired due to Term
First Claim
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1. A power line communication system for transmitting communication signals over distribution network power line conductors connected between a distribution network substation and a plurality of electric power customers, comprising:

  • a first communication terminal including transmitter means and receiver means arranged for coupling to said power line conductors at said substation, said transmitter means being operative to transmit a first interrogation signal in a first frequency band modulated by binary logic information signals, repeater means including first and second channels, said first channel including first receiver means and first transmitter means, said second channel including second receiver means and second transmitter means, said first and second receiver means and said first and second transmitter means being arranged for coupling to said power line conductors, and a second communication terminal including transmitter means and receiver means arranged for coupling to said power line conductors at one of said plurality of electric power customers, said second communication terminal including decoding and encoding logic circuit means connected to said transmitter means and said receiver means, said first channel of the repeater means providing a second interrogation signal in response to said first interrogation signal which has the same binary logic information as the first interrogation signal but which is in a second frequency band, non-overlapping with said first frequency band, said receiver means of the second communication terminal, in response to a second interrogation signal, including means reconstructing the binary logic information signals of the second interrogation signal, and means applying the binary logic information signals to said decoding and encoding logic circuit means, said transmitter means of the second communication terminal including means operative to modulate binary logic information signals applied thereto from said decoding and encoding logic circuit means, and being further operative to provide a first response signal in a third frequency band which is non-lapping with the frequency band of the second interrogation signal, said second channel of the repeater means providing a second response signal in response to said first response signal which has the same binary logic information as the first response signal but which is in a fourth frequency band, non-overlapping with the third frequency band, said receiver means of the first communication terminal being operative to receive said second response signal.

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