Method and apparatus for ringing telephone stations

Details Method and apparatus for ringing telephone stations Method and apparatus for ringing telephone stations

1993-04-23

1995-04-11

Dwyer, James L.

Telephonic communications

Call signal generating

379251, 379382, 379399, H04M 306

Patent

active

054066239

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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"Ringing System for Telephone Lines", R. E. Reynier, IBM Technical Disclosure Bulletin, vol. 12, No. 11, Apr. 1970.

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