Detection of ground or loop start configuration in telephone...

Details Detection of ground or loop start configuration in telephone... Detection of ground or loop start configuration in telephone...

H - Electricity

04

M

379/57

H04M 3/22 (2006.01) H04M 19/02 (2006.01)

Patent

CA 1201228

DETECTION OF GROUND OR LOOP START CONFIGURATION IN TELEPHONE LOOP SIGNALLING CIRCUIT Abstract of the Disclosure A telephone loop signalling circuit, which automatically replicates either a loop start or a ground start configuration under virtually all operating conditions of the telephone line including those which have heavily induced power line voltages. The circuit utilizes a bias network connected to the central office side of the line together with a plurality of detectors which coact with logic circuitry to differentiate between the two configurations under these widely varying conditions - i -

451894

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