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Apparatus for switching telephone line a response device, a data terminal or a telephone

  • US 4,660,218 A
  • Filed: 03/14/1985
  • Issued: 04/21/1987
  • Est. Priority Date: 03/14/1984
  • Status: Expired due to Term
First Claim
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1. A switching apparatus for automatically swtiching a connection between a telephone set and a telephone line or between said telephone line and a terminal device which forms a data loop circuit upon reception of a carrier signal sent through said telephone line and performs data communication, said telephone set being connected in parallel with said terminal device with respect to said telephone line, comprising:

  • a connector for selectively connecting said telephone line to said telephone set;

    incoming call signal detecting means for detecting an incoming call signal sent through said telephone line;

    looping means for forming a response loop circuit in response to an incoming signal detection output from said incoming call signal detecting means and for supplying the carrier signal from said telephone line to said terminal device;

    off-hook detecting means for detecting an off-hook state of said telephone set;

    means responsive to formation of said response loop circuit for sending out a repeating speech response message over said telephone line until said response loop circuit of said looping means is cancelled;

    terminal device operation detecting means for detecting operation of said terminal device;

    means for cancelling said response loop circuit of said looping means in response to a detection output from said off-hook detecting means; and

    means for cancelling the response loop circuit of said looping means and triggering said connector to disconnect said telephone set from said telephone line in response to a detection output from said terminal device operation detecting means.

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