Method and apparatus for ringing telephone stations
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United States of America Patent
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Apr 11, 1995
Grant Date -
N/A
app pub date -
Apr 23, 1993
filing date -
Apr 23, 1993
priority date (Note) -
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Abstract
A telephone ringing arrangement where a non-sinusoidal ringing voltage waveform is used that has significantly longer intervals during which the waveform is near zero as compared to a sinusoidal waveform. A connect interval is defined as the time during which the magnitude of the non-sinusoidal ringing voltage waveform remains less than a predefined threshold. The connect interval includes a zero-crossing of the ringing voltage waveform. For an illustrative ringing voltage waveform, the zero-crossing has zero slope. A ringing relay is controlled to connect the non-sinusoidal waveform to a telephone line such that the connection time, including relay bounce time, occurs only during one of the connect intervals. Similar principles may be used based on a disconnect interval of the ringing current waveform, to reduce transients on disconnection.
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