试题详情
- 多项选择题Which two statements are true about optical networks?（）
A、SONET and SDH both use time-division multiplexing.
B、An optical transport network system uses time-division multiplexing.
C、SONET and SDH both use wavelength-division multiplexing.
D、An optical transport network system uses wavelength-division multiplexing.
- A,D
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