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Direct digital access arrangement circuitry and method for connecting to phone lines

  • US 7,301,995 B2
  • Filed: 02/17/2004
  • Issued: 11/27/2007
  • Est. Priority Date: 04/22/1997
  • Status: Expired due to Fees
First Claim
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1. A method for communicating with phone lines across an isolation barrier that comprises a plurality of isolation elements, the method comprising:

  • generating an encoded digital differential signal from a digital data signal, wherein the encoded digital differential signal includes control data and the digital data signal; and

    communicating said encoded digital differential signal from phone line side circuitry to powered side circuitry across at least two of the isolation elements of said isolation barrier, the at least two isolation elements comprising at least a first isolation capacitor and a second isolation capacitor, wherein bidirectional communication exists through the first and second isolation capacitors;

    providing a clock signal from the powered side circuitry to the phone line side circuitry through at least one of the plurality of isolation elements; and

    providing power from the powered side circuitry to the phone line side circuitry while still maintaining the isolation required by the phone line isolation regulatory standards.

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