Subscriber line circuit

Details Subscriber line circuit Subscriber line circuit

1977-05-19

1978-08-01

Robinson, Thomas A.

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

Patent

active

041044886

ABSTRACT:
Telephone subscriber line circuits and an all-electronic telephone exchange are described wherein Hall effect devices are incorporated to detect line looping, dialing and ring-trip.

REFERENCES:
patent: 3889069 (1975-06-01), Ault
patent: 3903375 (1975-09-01), DeWit
patent: 4020294 (1977-04-01), Kitajewski et al.
patent: 4022980 (1977-05-01), Kitajewski et al.

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