问题描述：
[多选]
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（）．
A．NCPF 单板故障或程序跑死fault occurs on the NCPF board or the program is down.
B．NCPF单板应用程序下载错误error occurs when you download application of the NCPF board.
C．OSC 单板故障或程序跑死fault occurs on the OSC board or the program is down.
D．OSC 单板的接收光功率不在正常范围 the optical receive power of the OSC board is not within the normal range.
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