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Phone line LAN

  • US 5,995,598 A
  • Filed: 02/10/1997
  • Issued: 11/30/1999
  • Est. Priority Date: 02/10/1997
  • Status: Expired due to Fees
First Claim
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1. A method of enabling a data processing system to communicate with a second data processing system, comprising:

  • connecting a modem in the data processing system to a telephone conductor;

    detecting an existing voltage in the telephone conductor indicating that no communications device connected to the telephone conductor is off-hook; and

    configuring the modem to transmit and receive signals on the telephone conductor by adding the signals to the existing voltage, the signals comprising a maximum voltage level which is below a predetermined threshold less than or equal to a difference between the existing voltage and a voltage indicating that a communications device connected to the telephone conductor is off-hook.

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