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Dual band bypass modem

  • US 6,002,682 A
  • Filed: 07/25/1997
  • Issued: 12/14/1999
  • Est. Priority Date: 05/13/1997
  • Status: Expired due to Term
First Claim
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1. A method for bypassing a telephone switching system, the method operating in a system including, a first modem, a first subscriber loop coupled to the first modem, a second modem coupled to the first subscriber loop and a packet-switched network, a third modem coupled to a second subscriber loop and the packet-switched network, a fourth modem coupled to the second subscriber loop, the method comprising the steps of:

  • establishing a connection between the first modem and the second modem through the first subscriber loop;

    exchanging information between the first modem and the second modem through the first subscriber loop to establish a first agreed-upon communication rate;

    if the first agreed-upon communication rate is below 4,000 effective symbols per second, communicating between the first modem and the second modem across the first subscriber loop at a rate below 4,000 effective symbols per second;

    if the first agreed-upon communication rate is above 4,000 effective symbols per second, communicating between the first modem and the second modem across the first subscriber loop at a rate above 4,000 effective symbols per second;

    converting between analog circuit-based data on the first subscriber loop and digital packet-based data on the packet-switched network;

    establishing a connection from the second modem across the packet-switched network to the third modem;

    establishing a connection from the third modem to the fourth modem through the second subscriber loop;

    exchanging information between the third modem and the fourth modem through the second subscriber loop to establish a second agreed-upon communication rate;

    if the second agreed-upon communication rate is below 4,000 effective symbols per second, communicating between the third and fourth modem across the second subscriber loop at a rate below 4,000 effective symbols per second;

    if the second agreed-upon communication rate is above 4,000 effective symbols per second, communicating between the third and fourth modem across the second subscriber loop at a rate above 4,000 effective symbols per second;

    wherein if the communication circuit communicates on a plurality of orthogonal channels on a single physical channel, the effective symbol rate is equal to the summation of the symbol rates across the plurality of orthogonal channels; and

    if the communication circuit communicates on a single physical channel, the effective symbol rate is equal to the symbol rate for the single channel.

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