| 摘要 |
The device is provided for transmitting the monitoring signal in the system using a optics-fiber, and includes a tap extracting the optics-signal, a receiver converting the extracted signal into a electric signal, a lowpass filter extracting the monitoring signal from the electric signal, a time range discrimination circuit searching for the time range for inserting the monitoring signal, a monitor control part inserting the monitoring signal, a laser modulator.
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