Sealing current generator for a telephone circuit

Details Sealing current generator for a telephone circuit Sealing current generator for a telephone circuit

1990-05-15

1992-07-14

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379324, 379394, 379402, 379403, H04M 1908

Patent

active

051310333

ABSTRACT:
A sealing current generator for a telephone circuit provides a conventional nominal DC bias current in a telephone loop, and also temporarily provides a higher "zap" current whenever the DC current path is broken and then reapplied to the telephone loop. During the "zap" period, the voltage placed across the telephone loop is progressively increased in a number of predetermined steps if the current actually measured in the telephone loop fails to exceed a minimum value. The voltage is then maintained at its last level for the remainder of the "zap" period, after which the device returns to its base mode of providing a nominal DC bias current to the telephone loop.

REFERENCES:
patent: 3982080 (1976-09-01), Ukeiley
patent: 4716358 (1987-12-01), Fucito
patent: 4766606 (1988-08-01), Bardutz et al.
patent: 4771449 (1988-09-01), Kiko et al.
patent: 4887278 (1989-12-01), Gupta
patent: 4984267 (1991-01-01), Martinez

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