H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/63
H04M 19/00 (2006.01) H04M 3/30 (2006.01)
Patent
CA 1157597
ABSTRACT OF THE DISCLOSURE This invention relates to a current supplying circuit for supplying a current to a terminal apparatus through a ring line and a tip line which are connected through resistance elements to a potential source and ground, respectively. This current supplying circuit includes a current detector for generating first and second detection signals of amplitudes proportional to the currents flowing in the ring and tip lines, respectively, a reference gen- erator for generating a reference signal, and a comparator for comparing the signal difference between the first and second detection signals and the reference signal so as to produce a signal in accordance with the compared result, thus a shorted-to-ground fault on the ring line or tip line being detected by monitoring the signal produced in accordance with the compared result. After the shorted-to-ground fault is detected, the current supplying circuit is protected from breakdown.
365537
Hagishima Koichi
Kitano Junjiro
Takeshita Tetsuo
Gowling Lafleur Henderson Llp
Hitachi Ltd.
Nippon Telegraph & Telephone Public Corporation
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