Patent ID: 6160887
Filing Date: 2000-12-12
Classification: H04M

Abstract:
A loop-current regulator system for protecting terminal telephone equipment coupled to telephone lines from high telephone line loop-current comprising, in combination:a current regulator for protecting said terminal telephone equipment from excess power generated by current signals which pass through said telephone lines to said terminal telephone equipment;signal network circuit coupled to said current regulator for providing an alternating current (AC) path for AC signals to pass by said current regulator while minimizing attenuation of said AC signals;bridge rectifier circuit coupled to said current regulator, said signal network circuit, and said telephone lines for allowing said current signals to pass in only a single direction through said current regulator and said signal network circuit regardless of polarity of said telephone lines wherein said bridge rectifier circuit comprises a pair of zener diodes coupled to said telephone lines, said current regulator, and said signal network circuit for limiting a maximum voltage across said current regulator and said signal network circuit; andsurge protection circuit coupled to said bridge rectifier circuit and to said telephone lines for protecting said terminal telephone equipment form line-to-line surges.