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Cellular network data transmission system

  • US 5,125,021 A
  • Filed: 02/28/1990
  • Issued: 06/23/1992
  • Est. Priority Date: 08/31/1989
  • Status: Expired due to Term
First Claim
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1. A system for transmitting data between a subscriber site and at least one monitoring station, comprising:

  • sensor circuitry for generating data responsive to an event at the subscriber site;

    first transmission circuitry responsive to said sensor circuitry operable to transmit the data from the subscriber site using a cellular telecommunication network;

    second transmission circuitry responsive to said sensor circuitry operable to transmit the data from the subscriber site using a radio link telecommunications network;

    first fault detect circuitry coupled to said first transmission circuitry and second fault detect circuitry at the monitoring station for continuously monitoring the operability of said cellular telecommunication network; and

    selection circuitry coupled to said first fault detect circuitry for automatically switching to said second transmission circuitry when said first fault detect circuitry detects a fault in said first transmission circuitry even if no event-related data is being transmitted over said first transmission circuitry.

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