问题描述：
[多选]
对于只使用G．652光纤的系统，使用NRZ编码方式时，残余色散应遵循欠补偿原则，以下说法正确的是？（）For the system that only uses the G．652 fiber， the principle of under-compensation should be followed for the residual dispersion in the case of NRZ encoding mode． Which of the following statements about the principle are true？（）
A．对于复用段长度小于和等于800公里的400G/800G系统，系统的残余色散在10公里和20公里之间。For the 400G/800G system with the length of MS being less than or equal to 800 kilometers, the residual dispersion of the system ranges between 10 kilometers and 20 kilometers.
B．对于复用段长度大于800公里，小于1200公里的系统400G系统，系统的残余色散在30公里和50公里之间；For the 400G system with the length of MS being larger than 800 kilometers and less than 1200 kilometers, the residual dispersion of the system ranges between 30 kilometers and 50 kilometers.
C．对于复用段长度大于800公里，小于1200公里的系统800G系统，系统的残余色散在10公里和30公里之间。For the 800G system with the length of MS larger than 800 kilometers and less than 1200 kilometers, the residual dispersion of the system ranges between 10 kilometers and 30 kilometers.
D．对于超过800公里的复用段，在工程开通时，需要用服实地测量线路光纤的色散以及PMD实测值。For the MS with its length over 800 kilometers, it is necessary for the customer service personnel to conduct the field measurement of the dispersion value along the fiber link and the PMD value in case of the engineering commissioning.
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上一篇：为了调平WDM系统各功率点的功率平坦度，可以利用系统中存在的功率调节单板（）。 Which of the following power modulation boards of the system can be used to optimize the power flatness at different nodes of the WDM system？（）
下一篇：在ZXWM M900 设备中如果发现无法建立正常监控通道，可能的原因是If it is found that normal monitoring channels cannot be set up in ZXWM M900 equipment， the possible causes would be（）．
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