Methods and apparatus for protecting line relay contacts in a te

Details Methods and apparatus for protecting line relay contacts in a te Methods and apparatus for protecting line relay contacts in a te

1982-02-26

1984-10-30

Brown, Thomas W.

179 99H, H04M 100

Patent

active

044801521

ABSTRACT:
Line relay contacts (LR1.sub.1, LR1.sub.2) are protected from power surges appearing on a telephone line (L1) during connect or disconnect of a station set (S1) from the line, by operating a hold relay (HR1) to place a hold bridge (HB1) across the line (L1) before energizing the line relay (LR1) to connect or disconnect the station set.

REFERENCES:
patent: Re29078 (1976-12-01), Tate
patent: Re29884 (1979-01-01), Komine et al.
patent: 3549820 (1970-12-01), Knollman
patent: 3733442 (1973-05-01), Lee
patent: 3895192 (1975-07-01), Angner et al.
patent: 3920929 (1974-03-01), Tate
patent: 3985959 (1976-10-01), Komine et al.
patent: 3996426 (1976-12-01), Lancaster
patent: 4088846 (1978-05-01), McEowen
patent: 4351987 (1982-09-01), Feil

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