Loop, dial pulse and ring trip detection circuit with capacitive

Details Loop, dial pulse and ring trip detection circuit with capacitive Loop, dial pulse and ring trip detection circuit with capacitive

1978-11-01

1980-03-04

Robinson, Thomas A.

179 18HB, 179 84A, H04B 346, H04M 302

Patent

active

041918592

ABSTRACT:
A circuit which detects the presence and absence of a telephone subscriber loop, before and after ringing current is applied to the loop. Coils functioning as magnetic field generating devices and a Hall effect device are used to perform the detection function. Inclusion of a capacitive shunt network limits the responsiveness of the Hall effect device during ringing, permitting use of the device on lines to which multiple ringers are connected.

REFERENCES:
patent: 4104488 (1978-08-01), Weir et al.

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