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Cellular telephone-modem interface for data communication

  • US 5,873,039 A
  • Filed: 06/17/1997
  • Issued: 02/16/1999
  • Est. Priority Date: 11/28/1994
  • Status: Expired due to Term
First Claim
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1. A method for operating a data communication link between a data processing system and a remote location accessible via a cellular telephone, said data processing system having a serial port connection including a first data line carrying data from the data processing system, and a second data line carrying data to the data processing system, said data processing system coupled to a modem via said serial port, said modem including a tip/ring interface for connecting to a wired telephone jack and a connector, said connector providing external access to said first data line, to one or more analog inputs of said modem, an off-hook signal output of said modem and an analog output of said modem, said cellular telephone including a modem interface coupled to said connector, said method comprising the steps of:

  • issuing through said first data line a modem dialing command including a telephone number of said remote location;

    thereafterreceiving, using said modem, said modem dialing command via said first data line;

    thereafterresponding to said modem dialing command by activating said off-hook signal output;

    thereafterresponding, using said cellular telephone, to said activated off-hook signal output by outputting a simulated dial tone onto one of said one or more analog inputs;

    thereafterdialing, using said cellular telephone, said telephone number as received via said first data line to initiate a call;

    thereafterreceiving, using said cellular telephone, an answer tone from said remote location;

    thereafteroutputting, using said cellular telephone, said answer tone to one of said one or more analog inputs;

    thereaftertranslating, using said modem, data received from said first data line into analog modem output signals for transmission onto said analog output;

    transmitting, using said cellular telephone, said analog modem output signals from said analog output to said remote location;

    receiving, using said cellular telephone, analog modem input signals from said remote location;

    transmitting, using said cellular telephone, said analog modem input signals to one of said one or more analog inputs; and

    translating, using said modem, said analog modem input signals into digital data for transmission onto said second data line.

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