| 摘要 |
A ground fault detector for TI span equipment for transmitting signals from a central office to a network interface unit and receiving signals at the central office from the network interface unit. The TI span equipment includes a first pair of cables for transmitting data payload from the central office to the network interface unit and a second pair of cables for receiving data payload at the central office from the network interface unit. A line repeater is located along the TI span equipment between the central office and the network interface unit. The line repeater includes a transformer with core and a first, second, third and fourth coil. The coils are coupled to the transmit and receive span, and the transformer core saturates when the current differential between the coils exceeds a predetermined level. When the core is saturated, signals present on the first coil are not imposed on the second coil. A detector device senses the absence of a signal on the second coil determines that there is a ground fault.
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