Technique for estimation of a subscriber line insertion loss

  • US 6,894,504 B2
  • Filed: 03/05/2001
  • Issued: 05/17/2005
  • Est. Priority Date: 03/03/2000
  • Status: Expired due to Term
First Claim
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1. A method of estimating insertion loss of a subscriber line comprising the steps of:

  • placing both wires of a selected telephone line in electrical contact with each other;

    obtaining a single-ended measurement of a capacitance between said selected telephone line and ground;

    applying an AC voltage between said selected telephone line and ground;

    obtaining a single-ended measurement of a voltage between said selected telephone line and ground;

    obtaining a single-ended measurement of a current in said selected telephone line; and

    estimating an insertion loss from said capacitance, said voltage and said current measurements.

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