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Modem with call waiting

  • US 4,852,151 A
  • Filed: 02/24/1988
  • Issued: 07/25/1989
  • Est. Priority Date: 02/24/1988
  • Status: Expired due to Term
First Claim
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1. For use with a modem connected to a telephone line and to a data terminal, an improvement to said modem for detecting a call waiting signal on said telephone line, comprising:

  • first means for detecting a loss of carrier signal on said telephone line;

    second means for detecting a presence of energy in a call progress band;

    third means responsive to detection of said loss of said carrier signal and subsequent detection of said presence of said energy in said call progress band for signalling a user that a new call is waiting; and

    fourth means for generating a selectable default response if said user does not respond within a predetermined time period.

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