Electronic external line repeater

Details Electronic external line repeater Electronic external line repeater

H - Electricity

04

M

379/68

H04M 7/00 (2006.01) H04B 1/58 (2006.01) H04M 19/00 (2006.01)

Patent

CA 1198844

ABSTRACT OF THE DISCLOSURE An electronic external line repeater connects a two- wire side to two four-wire sides. The repeater contains two optocouplers. A self-compensating negative feedback circuit is connected from the two-wire side to the incoming four- wire side. Initial spread and age degradation in the octo- coupler are thus counteracted. The feedback circuit contains a lowpass filtering and comparing circuit connected to the line amplifier of the repeater.

421140

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