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Apparatus for communicating with processing apparatus over a telephone network

  • US 4,273,961 A
  • Filed: 11/14/1979
  • Issued: 06/16/1981
  • Est. Priority Date: 11/14/1979
  • Status: Expired due to Term
First Claim
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1. In a signalling system, apparatus for communicating with processing apparatus over a telephone network, comprising:

  • first means operative under prescribed circumstances to produce an alarm condition for initiating an alarm communication over the telephone network;

    second means operative at a prescribed time of day to produce a self-check condition for initiating a self-check communication over the telephone network;

    memory means arranged to store therein telephone number data representing a plurality of telephone numbers; and

    third means operative following an alarm condition produced by the first means to obtain and employ selectively in a repeated sequential fashion the telephone number data stored in the memory means representing the plurality of telephone numbers, each up to a predetermined corresponding maximum number of times, in dialing operations for attempting a successful communication with the processing apparatus over the telephone network, and operative at or following a self-check condition produced by the second means and in the absence of an alarm condition produced by the first means to obtain and employ the telephone number data stored in the memory means representative of one, and only one, of the telephone numbers continuously for an indefinite number of times in dialing operations for attempting a successful communication with the processing apparatus over the telephone network, whereby the telephone number data stored in the memory means representative of the other telephone numbers is reserved exclusively for use in dialing operations following an alarm condition produced by the first means.

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