Telephone system loop current detector

Details Telephone system loop current detector Telephone system loop current detector

1997-08-26

1998-06-16

Saras, Steven

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

379188, 379377, 379379, 340659, 340660, 340664, H04M 322, H04M 300, G08B 2100

Patent

active

057683425

ABSTRACT:
A current detector for connection in series with a lead carrying current to be detected, has a first branch with a plurality of series connected diodes having an anode end and a cathode end for connection to the lead, a first optocoupler light emitting diode connected in series with a resistor, connected in parallel with the first branch, the optocoupler diode being connected in the same polarity direction as the diodes in the first branch, and a first further diode connected in parallel with the first branch, in opposite polarity direction as the diodes in the first branch.

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Derwent Abstract, DE 2 822 897.

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