Digital circuit for conditional initialization

Details Digital circuit for conditional initialization Digital circuit for conditional initialization

1993-08-30

1994-10-25

Dwyer, James L.

Telephonic communications

Repeater

Pulse or tone repeater

379413, 379377, H04M 300

Patent

active

053596501

ABSTRACT:
The invention relates to remotely powered circuitry, and in particular to telephones. The circuit of the invention uses a counter to measure or compare the duration of power supply interruptions on the remote power supplying line to cause the remotely powered circuitry to be initialized whenever the duration of such an interruption becomes greater than or less than a specified duration. Advantageously, comparators are used so as to be able to take a plurality of durations into consideration. Thus, each time the power supply on the remote power line is interrupted, if the interruption is not of an acceptable duration, then the remotely powered circuitry is initialized.

REFERENCES:
patent: 3997740 (1976-12-01), Eubank et al.
patent: 4087649 (1978-05-01), Kerman et al.
patent: 4227054 (1980-10-01), Gilmer
patent: 4266099 (1981-05-01), Kayalioglu et al.
patent: 4278842 (1981-07-01), Simmons
patent: 4289933 (1981-09-01), Henry
patent: 4347406 (1982-08-01), Zurawski
patent: 4388499 (1983-06-01), Janssen
patent: 4590432 (1986-05-01), Di Borgoricco
Ott, "Eight-Bit CMOS Microcomputer Unit Ideal For Intelligent Telephone Systems", Mini-Micro Conference Record, pp. 1-5 (May 1984).

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