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Central office interface techniques for digital subscriber lines

  • US 6,850,618 B1
  • Filed: 05/15/2000
  • Issued: 02/01/2005
  • Est. Priority Date: 05/15/2000
  • Status: Expired due to Term
First Claim
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1. A system for interfacing a telephone line having a first wire and a second wire with a central office, the system comprising:

  • a DSL modem connected to a coupling transformer having a line side and a circuit side, the modem for processing DSL frequency band signals received from the telephone line, wherein the line side of the transformer is coupled between the first and second wires of the telephone line;

    a reactive impedance serially coupled to the line side of the transformer, the reactive impedance having a magnitude that decreases as signal frequency increases;

    a POTS line card having a two-wire interface, and for processing POTS frequency band signals received from the telephone line, wherein the two-wire interface of the POTS line card is operatively coupled across the reactive impedance.

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