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Telephone extension system utilizing power line carrier signals

  • US 4,479,033 A
  • Filed: 03/29/1982
  • Issued: 10/23/1984
  • Est. Priority Date: 03/29/1982
  • Status: Expired due to Term
First Claim
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1. A power line telephone extension system for carrying electrical signals between a subscriber'"'"'s telephone line of a conventional telephone communication system and the subscriber'"'"'s extension telephone over available electric power wires comprising,(a) a master location including master linking circuits for processing the signals, electrically coupled between the subscriber'"'"'s telephone line and power wires,(b) an extension location along said power wires including an extension telephone having a tip line and extension linking circuits for processing the signals, electrically coupled between the extension telephone and power wires and(c) a directional coupler electrically coupled between the extension linking circuits and the extension telephone,(d) the directional coupler including first and second coils inductively coupled together(e) the first coil being in electrical series with the extension telephone tip line and(f) the second coil being coupled at one end to a first signal flow path in the extension linking circuits and at the other end to a second signal flow path in the extension linking circuits,(g) whereby the power wires carry the electrical signals between the subscriber'"'"'s telephone line and extension telephone and signals from the extension telephone to the telephone line flow along the first path while signals from the telephone line to the extension flow along the second path.

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