Electronic external line repeater

Details Electronic external line repeater Electronic external line repeater

1983-01-21

1985-12-24

Dwyer, James L.

179170R, H04B 158

Patent

active

045608431

ABSTRACT:
An electronic external line repeater connects a two-wire side to two four-wire sides. The repeater contains two optocouplers (FT1-D1, FT2-D2). A self-compensating negative feedback circuit is connected in accordance with the invention from the two-wire side to the incoming four-wire side. Initial spread and age degradation in the optocoupler (FT2-D2) is thus counteracted. The feedback circuit contains a lowpass filtering and comparing circuit (F3) connected to the line amplifier (F2) of the repeater.

REFERENCES:
patent: 4045615 (1977-08-01), James et al.
patent: 4228323 (1980-10-01), Feiner et al.

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