Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1994-12-21
1996-09-10
Hofsass, Jeffery
Telephonic communications
Subscriber line or transmission line interface
Network interface device
379418, 379322, 379324, H04M 1900
Patent
active
055553010
ABSTRACT:
In a digital data communications device for use in an ISDN environment, a power supply apparatus and method are provided for energizing telephone danger circuitry or other alerting mechanisms. Embodiments of the present invention employ signal generators which control switching circuitry that converts a low voltage DC power source into a low voltage alternating current. A step-up transformer is used to convert or transform this low voltage into a high voltage alternating current, which is rectified and filtered to generate a high voltage direct current. The signal generators also control the switching circuitry which applies this high voltage direct current to an alerting mechanism and alternately provides a path to discharge energy which may be stored in the alerting mechanism, causing the alerting mechanism or other ringer circuitry to resound.
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"Technical Interface Reference Manual for Customer Equipment", General Telephone, Dec. 1976.
Boike Barry
Nabors David H.
Gamburd Nancy R.
Hofsass Jeffery
Motorola Inc.
Saint-Surin Jacques M.
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