Circuit arrangement for protecting a subscriber circuit of a telecommunication switching system
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United States of America Patent
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-
Aug 10, 1999
Grant Date -
N/A
app pub date -
Dec 19, 1996
filing date -
Dec 21, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Circuit arrangement for protecting a subscriber circuit of a telecommunication system for the balanced-to-ground connection of a subscriber line to which a ringing voltage source is connected unbalanced to ground via an electromechanical or electronic switch upon simultaneous disconnection from the subscriber circuit for call signalling against inductive over-voltages that occur upon reconnection to the subscriber line, characterized by a two-way threshold circuit (D) with symmetrical pass/stop characteristic whose threshold voltage is higher than the peak voltage of the ringing voltage source (UGR) that is connected between the leads (a, b) of the subscriber line.
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