Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...
Patent
1998-12-08
2000-10-03
Nguyen, Duc
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Testing of network terminating interface, subscriber trunk...
379 27, H04M 124
Patent
active
061283681
ABSTRACT:
An apparatus for monitoring telecommunication transmission is disclosed that a resistance detection unit having a plurality of resistors connected in series is connected between an input terminal of a transformer in a power supply at an absolute ground potential and a high voltage output terminal of the transformer at a relative ground potential. A photo-coupler transistor is connected in parallel with one of the resistors such that the photo-coupler transistor is conductive when a leakage current flows through the resistor, thereby generating a low potential signal. The low potential signal is transmitted to a central processing unit through a logic gate. Upon reception of the signal, the central processing unit will shut down the power supply for security.
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Barnie Rexford
Nguyen Duc
Teamgreat Corporation
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