| 摘要 |
A transmission circuit sends a transmission signal from a signal-processing unit to a port. A reception circuit sends a received signal from a port to the signal-processing unit. A waveform monitor, by monitoring the waveform of the transmission signal that is sent to the port from the transmission circuit, generates a feedback signal. A switch unit connects the feedback signal from the waveform monitor to the reception circuit at transmission timing. The signal-processing unit compares the transmission signal with the feedback signal of the transmission signal.
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