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Cellular digital packet data (CDPD) network transmission system incorporating cellular link integrity monitoring

  • US 5,454,024 A
  • Filed: 02/15/1994
  • Issued: 09/26/1995
  • 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, having a plurality of sensors associated therewith, and at least one monitoring station using first and second transmission circuits connected to first and second telecommunications networks, the first telecommunications network providing cellular digital packet data (CDPD) transmission, comprising:

  • fault detect circuit means coupled to the first transmission means for continuously monitoring the operation of the first transmission circuit and the integrity of the first telecommunications network; and

    control means coupled to the fault detect circuit means and controlled thereby for automatically creating a signal path between the sensors and the second transmission circuit upon loss of integrity of the CDPD network.

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