| 摘要 |
A fault isolating apparatus, system and method employing a fault isolator comprising first, second, third and fourth ports, the first and third ports being adapted to be connected to the ring and tip lines of a subscriber loop and the second and fourth ports being adapted to be connected to a subscriber location; and first and second circuit means connected between the first and second ports and the third and fourth ports, the first circuit means being adapted to block the passage of current from the first to the second port and to allow the passage of current from the second to the first port and the second circuit means being adapted to allow passage of current from the third to fourth port and to block passage of current from fourth to the third port.
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