×

Dual mode cellular modem

  • US 5,479,480 A
  • Filed: 12/30/1993
  • Issued: 12/26/1995
  • Est. Priority Date: 12/30/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for use in a modem to maintain a data connection between a cellular-side of the data connection and a public-switched telephone side of the data connection, the method comprising the steps of:

  • operating the modem in a current mode of operation, wherein the current mode of operation is either a digital mode or an analog mode;

    receiving in the modem a data signal from the cellular-side of the data connection;

    monitoring the received data signal in the modem to determine a subsequent mode of operation for the modem, wherein the subsequent mode of operation is analog if the current mode of operation is digital and the subsequent mode of operation is digital if the current mode of operation is analog.

View all claims
  • 21 Assignments
Timeline View
Assignment View
    ×
    ×