OA子架的机架/子架的拨码开关是在（）位置

问答题Please tell possible problems following the implementation of EDFA.

问答题What is nominal central frequency?

填空题ZXMPM600的保护倒换包括基于OTUVp OTUp的（），OP的（）

填空题由于网元地址是一种资源，为了更好利用这种资源，网络通常采用可变长地址规划原则。采用最小的网段地址规划，“可用IP地址”数量的最小值是（）

判断题When deployed to transmission application of wavelengths up to 160 wavelengths, the ZXWM M900 performs optical amplification of signals at the C band and the L band independently at the same time.