Ring trip detector with hall effect devices

Details Ring trip detector with hall effect devices Ring trip detector with hall effect devices

H - Electricity

04

M

379/16

H04M 3/22 (2006.01)

Patent

CA 1060128

Abstract of the Disclosure 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 con- tinues to supervise the called line loop.

253765

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