Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1978-09-21
1981-06-16
Konick, Bernard
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
179 18HB, 328150, 307 38, H04M 126
Patent
active
042739640
ABSTRACT:
A telephone ringing and tone generating circuit including circuitry for generating a plurality of tones, circuitry for generating a plurality of ringing currents and circuitry for generating a plurality of power voltages. Dual sources of each of the generating circuitry are provided. A timing circuit is provided to provide cadence (timing) signals for each of the tones, currents and voltages. Switching devices corresponding to each of the dual types of generating circuitry are operable to switch from one of the dual circuits to the other. Monitoring circuits are provided to monitor the outputs and on detection of a fault in one type of output to switch from the corresponding on line generating circuitry to the back-up.
REFERENCES:
patent: 2740845 (1956-04-01), Mills et al.
patent: 3601551 (1971-08-01), Weber
patent: 4145577 (1979-03-01), Kojima et al.
Konick Bernard
Popek Joseph A.
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