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External resistor and method to minimize power dissipation in DC holding circuitry for a communication system

  • US 6,330,330 B2
  • Filed: 12/15/2000
  • Issued: 12/11/2001
  • Est. Priority Date: 04/22/1997
  • Status: Expired due to Term
First Claim
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1. A communication system, comprising:

  • phone line side circuitry capable of being coupled to a phone line at a user end of the phone line; and

    a DC holding circuit within said phone line side circuitry, the DC holding circuit capable of providing at least some DC termination characteristics at the user end of the phone line, the DC holding circuit including a power dissipating resistor coupled external to an integrated circuit chip interface of said phone line side circuitry, wherein the phone lines side circuitry is configured to communicate with an isolation barrier and wherein the phone line side circuitry is further configured to generate a power supply within the phone line side circuitry from a signal transmitted across the isolation barrier.

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