The subscriber line short detection device (Subscriber Line Short Detecting Device)

摘要

The present invention relates to a subscriber line short-circuit detection apparatus that automatically detects and notifies a subscriber line when a subscriber line is short-circuited.;In the present invention, three switches and buffers are added to the switchboard subscriber board so that only when the subscriber is in a call or in a normal mode such as an on-hook mode, the switch is always turned off, and when the impedance of the line is triggered to a value having an infinite value, And detects a short circuit of the subscriber line by comparing the voltage of the loop for supplying the DC current to the subscriber telephone from the buffer.;Therefore, the present invention maximizes the telephone disconnection time caused by the short circuit of the subscribers, so that the smoothness of the telephone conversation can be maintained at all times.