Line current protection circuit for use with a PCMCIA-architecture modem card

  • US 5,532,898 A
  • Filed: 04/01/1994
  • Issued: 07/02/1996
  • Est. Priority Date: 04/01/1994
  • Status: Expired due to Term
First Claim
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1. A protection circuit intended for use with a line interface circuit that is electrically connectable to a telephone line, the protection circuit comprising:

  • relay means, connected between the interface circuit and the telephone line, for selectively providing an open or a closed connection between the line interface circuit and the telephone line; and

    detection means for detecting the magnitude of a line-current presented to the interface circuit via a supply voltage placed across the telephone line and for causing the relay means to be opened or closed depending on the magnitude of the line-current.

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