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Dial inbound meter interface unit which derives its power from a telephone line

  • US 5,454,031 A
  • Filed: 03/08/1995
  • Issued: 09/26/1995
  • Est. Priority Date: 06/04/1993
  • Status: Expired due to Term
First Claim
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1. An interface unit capable of deriving its power from a telephone line and capable of data transmission to a central location over the telephone line, said interface unit comprising:

  • means for receiving data;

    means for transmitting data;

    means for determining the time at which said means for receiving data and means for transmitting data are to be active,means for coupling a telephone line to said data transmitting means, the telephone line alternatingly maintaining an on-hook or an off-hook condition;

    means for obtaining a current from the telephone line, wherein a leakage current is obtained during an on-hook condition, and a current of greater amperage than said leakage current is obtained during an off-hook condition; and

    long term storage means for long term storing of a charge derived from the leakage current, wherein said long term storage means is capable of energizing said interface unit throughout the duration of said on-hook condition, and wherein said determining means is continuously energized by said long term storage means whenever the telephone line is in the on-hook condition.

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