1979-04-27
1980-12-16
Brigance, Gerald L.
179 84A, 179 251, H04M 166
Patent
active
042399351
ABSTRACT:
A ringing signal generator is disclosed for remotely generating telephone ringing signals having a trapezoidal waveform. A single capacitor and two constant current sources control the wave shape while current limiting is provided on both the positive going and negative going half-cycles of the ringing signal. A voltage offset is provided between the ringing signal source and the subscriber line to prevent loading the ringing signal with the subscriber line feed circuit.
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Bosik Barry S.
Tuhy, Jr. Frank P.
Bell Telephone Laboratories Incorporated
Brigance Gerald L.
Nimtz Robert O.
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