Telephone and communications line overvoltage protection apparatus
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United States of America Patent
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Oct 14, 1997
Grant Date -
N/A
app pub date -
Jul 18, 1996
filing date -
Nov 17, 1994
priority date (Note) -
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status (Latency Note)
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Abstract
An overvoltage protection apparatus is used with a pair of telephone or communications TIP/A and RING/B lines including voltage clamping circuitry for clamping voltage signals on the lines at a predetermined voltage potential. The voltage clamping circuitry includes a pair of voltage clamping devices connected in series between the TIP/A and RING/B lines and a third voltage clamping device connected between a junction connection of the pair of the voltage clamping devices and a ground potential connection and current limiting devices for limiting current flow in the lines. The predetermined voltage potential exceeds a primary alternating current (AC) power line peak value by a set tolerance value.
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