1976-03-03
1977-05-10
Robinson, Thomas A.
179 84A, H04M 302
Patent
active
040229807
ABSTRACT:
A Hall effect device is employed in telephone exchange circuitry for detecting when a called subscriber goes off-hook. This is done by detecting when a DC current due to line looping is superimposed on the AC current due to ringing whereupon ring trip occurs. Also described are circuits in which after ring trip has taken place the Hall device continues to supervise the called line loop.
REFERENCES:
patent: 3899644 (1975-08-01), Hunt
patent: 3903375 (1975-09-01), De Wit
Dyer Michael Philip
Kitajewski Ryszard
Sweet Anthony William
Hill Alfred C.
International Standard Electric Corporation
O'Halloran John T.
Robinson Thomas A.
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