Loop, dial pulse and ring trip detection circuit

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

1977-12-29

1979-09-04

Robinson, Thomas A.

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

Patent

active

041669282

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.

REFERENCES:
patent: 4099032 (1978-07-01), Roge et al.
patent: 4104488 (1978-08-01), Weir et al.

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