Power down feed

Details Power down feed Power down feed

1991-03-14

1994-06-21

Dwyer, James L.

Telephonic communications

Centralized switching system

Power supply

379398, 379400, H04M 324

Patent

active

053234537

ABSTRACT:
An arrangement for feeding the subscriber's lines (10) of a public exchange with reduced line current upon the occurrence of a power failure, when the temperature within the public exchange or the temperature of individual components, mounted on circuit boards on which line interface circuits are present, exceeds a predetermined reference value, when the length of a subscriber's line is less than a line length reference value, or when the conversation time on a subscriber's line exceeds a conversation time reference value. All subscriber's lines or individual subscriber's lines only are fed with the reduced line current for a restricted time (FIG. 5B).

REFERENCES:
patent: 4254305 (1981-03-01), Treiber
patent: 4410766 (1983-10-01), Beirne
patent: 4653088 (1987-03-01), Budd et al.
patent: 4760379 (1988-07-01), De Phillipo et al.
patent: 4856059 (1989-08-01), Halbig
Patent Abstracts of Japan, vol. 6, No. 107 (L-113)(57-37967). (abstract only).
Patent Abstracts of Japan, vol. 8, No. 194 (E-264) (59-81960).(abstract only).

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