试题详情
- 多项选择题Which three of these are optical channel data unit （ODU） overhead fields？ （）
A、general communication channel 0 （GCC0）
B、section monitoring
C、reserved （RES）
D、general communication channels 1 and 2 （GCC1 GCC2）
E、tandem connection monitoring activation deactivation （TCM ACT）
- C,D,E
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