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Method using low spectrum selectively for providing both ADSL and POTS service

  • US 6,404,774 B1
  • Filed: 02/12/1999
  • Issued: 06/11/2002
  • Est. Priority Date: 04/08/1998
  • Status: Expired due to Term
First Claim
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1. A method of providing both Plain Old Telephone Service (POTS) and Asymmetric Digital Subscriber Line (ADSL) data service over a common subscriber loop providing a predetermined frequency spectrum for transmission purposes, where the ADSL data service makes use of a multiplicity of quadrature modulated tones separated in frequency from one another across the predetermined frequency spectrum, and POTS makes use of only a portion of said predetermined frequency spectrum, the method comprising the steps of:

  • (a) using the portion of the predetermined frequency spectrum for POTS while a POTS call is in progress;

    (b) excluding the ADSL data service from at least the portion of the predetermined frequency spectrum and reducing the number of tones while a POTS call is in progress; and

    (c) expanding the ADSL data service into the portion of the predetermined frequency spectrum and increasing the number of tones while a POTS call is not in progress.

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