Method and apparatus for sending a data message to a selected station during a silent interval between ringing
First Claim
1. For use with a telephone switching system serving a plurality of stations and having a central processor for generating a data message and a ringing circuit for transmitting a first and a second ringing signal to a selected one of said stations, said first and second ringing signals having a silent interval therebetween, apparatus for sending a data message to a selected station during the silent interval between ringing signals while the apparatus remains connected to the ringing circuit;
- comprising;
detector means connectable to said ringing circuit and responsive to said first ringing signal for generating a status signal representative of said silent interval between said first and second ringing signals; and
sender means responsive to said status signal for sending to said selected station a signal representative of said data message during said silent interval.
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Abstract
For use with a telephone switching system serving a plurality of stations and having a central processor for generating data messages and a ringing circuit for generating ringing signals to a selected station, method and apparatus are disclosed for sending a data message to a selected station during a silent interval between ringing signals. The apparatus includes a detector and a sender. Responsive to a first ringing signal, the detector generates a status signal representative of the silent interval between ringing signals. During the silent interval, the sender sends to the selected station a frequency shift keyed signal representative of the data message.
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Citations
23 Claims
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1. For use with a telephone switching system serving a plurality of stations and having a central processor for generating a data message and a ringing circuit for transmitting a first and a second ringing signal to a selected one of said stations, said first and second ringing signals having a silent interval therebetween, apparatus for sending a data message to a selected station during the silent interval between ringing signals while the apparatus remains connected to the ringing circuit;
- comprising;
detector means connectable to said ringing circuit and responsive to said first ringing signal for generating a status signal representative of said silent interval between said first and second ringing signals; and sender means responsive to said status signal for sending to said selected station a signal representative of said data message during said silent interval. - View Dependent Claims (2, 3, 4)
- comprising;
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5. For use with a telephone switching system serving a plurality of stations and having a central processor for generating a data message and a ringing circuit for transmitting a first and a second ringing signal to a selected one of said stations, said first and second ringing signals having a silent interval therebetween, apparatus for sending a data message to a selected station during the silent interval between ringing signals;
- comprising;
detector means responsive to said first ringing signal for generating a status signal representative of said silent interval between said first and second ringing signals; sender means responsive to said status signal for sending to said selected station a first frequency shift keyed signal representative of said data message during said silent interval; and means responsive to said first frequency shift keyed signal for generating a second frequency shift keyed signal having a voltage level equivalent in magnitude and opposite in polarity to that of said first frequency shift keyed signal. - View Dependent Claims (6)
- comprising;
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7. For use with a telephone switching system serving a plurality of stations and having a central processor for generating a data message, said data message including unit identification and special service information, and also having a plurality of ringing circuits each for generating intermittent ringing signals separated by silent intervals to a selected one of said stations;
- apparatus for sending a data message to a selected station during a silent interval between intermittent ringing signals while the apparatus remains connected to the ringing circuit for generating ringing signals to the selected station;
comprising;a plurality of units each connectable to an associated one of said ringing circuits for detecting a silent interval between the intermittent ringing signals from the associated ringing circuit; and controller means responsive to said unit identification for selecting one of said plurality of units to receive said special service information; said selected unit comprising means for sending said special service information to said selected station during the silent interval between the intermittent ringing signals from the associated ringing circuit. - View Dependent Claims (8, 9, 10, 11)
- apparatus for sending a data message to a selected station during a silent interval between intermittent ringing signals while the apparatus remains connected to the ringing circuit for generating ringing signals to the selected station;
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12. For use with a telephone switching system serving a plurality of stations and having a central processor for generating special service information and also having a ringing circuit for transmitting to a selected one of said stations intermittent ringing signals separated by silent intervals, a method for sending special service information to a selected station during a silent interval between intermittent ringing signals while the ringing circuit remains connected for transmitting the intermittent ringing signals to the selected station;
- comprising the steps of;
detecting a first one of said ringing signals to said selected station; detecting a first one of said silent intervals after said first ringing signal; and sending a signal representative of said special service information to said selected station during said first silent interval. - View Dependent Claims (15, 16, 17)
- comprising the steps of;
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13. For use with a telephone switching system serving a plurality of stations and having a central processor for generating special service information and also having a ringing circuit for transmitting to a selected one of said stations intermittent ringing signals separated by silent intervals, a method for sending special service information to a selected station during a silent interval between intermittent ringing signals;
- comprising the steps of;
detecting a first one of said ringing signals to said selected station; detecting a first one of said silent intervals after said first ringing signal; sending a signal representative of said special service information to said selected station during said first silent interval; waiting a first special time interval after said first ringing signal; confirming the continuance of said first silent interval after said first special time interval; and sending a signal representative of said special service information to said selected station during said first silent interval after confirming the continuance of said first silent interval. - View Dependent Claims (14)
- comprising the steps of;
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18. For use with a telephone switching system serving a plurality of stations and having a central processor for generating special service information and also having a ringing circuit for transmitting to a selected one of said stations intermittent ringing signals separated by silent intervals, a method for displaying special service information at a selected station during a silent interval between intermittent ringing signals while the ringing circuit remains connected for transmitting the intermittent ringing signals to the selected station;
- comprising the steps of;
sending a signal representative of said special service information to said selected station during an interval of said silent intervals separating said ringing signals; receiving said representative signal at said selected station during said silent interval; and displaying said special service information at said selected station during said silent interval. - View Dependent Claims (19)
- comprising the steps of;
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20. For use with a telephone switching system serving a plurality of stations and having a central processor for generating special service information and also having a ringing circuit for transmitting to a selected one of said stations intermittent ringing signals separated by silent intervals, a method for displaying special service information at a selected station during a silent interval between intermittent ringing signals;
- comprising the steps of;
detecting a first one of said ringing signals to said selected station; detecting a first one of said silent intervals after said first ringing signal; waiting a special time interval after said first ringing signal; confirming the continuance of said first silent interval after said special time interval; sending a signal representative of said special service information to said selected station during said first silent interval after confirming the continuance of said first silent interval; receiving said representative signal at said selected station during said silent interval; and displaying said special service information at said selected station during said silent interval.
- comprising the steps of;
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21. For use with a telephone switching system serving a plurality of stations and having a central processor for generating special service information and also having a ringing circuit for transmitting intermittent ringing signals separated by silent intervals to a selected one of said stations, apparatus for displaying special service information at a selected station during a silent interval between intermittent ringing signals while the apparatus remains coupled to the ringing circuit;
- comprising;
means coupled to said ringing circuit for sending a signal representative of said special service information to said selected station during an interval of said silent intervals separating said ringing signals; means for receiving said representative signal at said selected station during said silent interval; and means for displaying said special service information at said selected station during said silent interval. - View Dependent Claims (22)
- comprising;
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23. For use with a telephone switching system serving a pluality of stations and having a central processor for generating special service information and also having a ringing circuit for transmitting intermittent ringing signals separated by silent intervals to a selected one of said stations, apparatus for displaying special service information at a selected station during a silent interval between intermittent ringing signals, comprising:
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means for detecting a first one of said ringing signals to said selected station; means for detecting said first silent interval after said first ringing signal; means for waiting a special time interval after said first ringing signal; means for confirming the continuance of said first silent interval after said special time interval; means for sending a signal representative of said data message to said selected station during said first silent interval after confirming the continuance of said first silent interval; means for receiving said representative signal at said selected station during said silent interval; and means for displaying said special service information at said selected station during said silent interval.
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Specification