Cellular network data transmission system
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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Abstract
A data transmission network uses a cellular network as a primary telecommunications link and a backup telecommunications link. The system continuously monitors the links and switches to the back up link if the cellular link is not operative. A software package is included in the computer at a monitoring station for effecting integrity checks of the links, and RF fault modules are also included.
111 Citations
14 Claims
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1. A system for transmitting data between a subscriber site and at least one monitoring station, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification