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Low voltage circuits powered by the phone line

  • US 6,587,560 B1
  • Filed: 03/04/1998
  • Issued: 07/01/2003
  • Est. Priority Date: 04/22/1997
  • Status: Expired due to Fees
First Claim
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1. A communication system, comprising:

  • phone line side circuitry configured to be coupled to phone lines;

    powered side circuitry configured to be coupled to the phone line side circuitry through an isolation barrier; and

    low voltage circuits in an integrated portion of the phone line side circuitry, the low voltage circuits having at least one low voltage power supply level generated from the phone line and the low voltage circuits operating at sufficiently low voltage level so as not to require low voltage drop hookswitch devices and low voltage drop diode bridge diodes to couple the integrated portion of the phone line side circuitry to the phone line.

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