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Power transfer apparatus for use by network devices including telephone equipment

  • US 6,449,348 B1
  • Filed: 05/29/1997
  • Issued: 09/10/2002
  • Est. Priority Date: 05/29/1997
  • Status: Expired due to Term
First Claim
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1. An apparatus for providing power to a telephone coupled to a network device, comprising:

  • a transmission line having a proximal end and a distal end, the distal end coupled to the network device;

    a coupler coupled to the proximal end of the transmission line, the coupler having a data input and a power input, the coupler couples power from the power input and the data signal from the data input to the transmission line, the coupled power signal and data signal forming one combined signal, the data signal including telephone bearer data;

    a decoupler coupled to the distal end of the transmission line, the decoupler having a data output coupled to the network device and a power output coupled to the network device, the decoupler supplies the data signal from the transmission line to the data output and the power from the transmission line to the power output;

    a circuit coupled to the decoupler and to the data signal, the circuit having a combined telephone and power signal output, the combined telephone and power signal output for outputting a combined signal that is a combination of the power and a telephone data signal corresponding to the data signal; and

    a power source switch coupled to the telephone, the power source switch having a first input coupled to the power output of the decoupler, the power source switch further having a second input coupled to receive a second power signal from an external power source, and wherein the power source switch is switchable between the first input and the second input to carry power to the telephone from one of at least the decoupler or the external power source.

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