多选题What are two important considerations when using 2- or 4-channel 15216 OADMs?（） (Choose two.)AAll Add channels require uniform power levels.BThe flexibility of wavelengths per OADM is limited.CIt is easier to balance Pass-Through and Add channels.DThere is lower pass-through loss using multi-channel OADMs.EYou can extract a single channel without dropping other channels.
多选题
What are two important considerations when using 2- or 4-channel 15216 OADMs?（） (Choose two.)
A
All Add channels require uniform power levels.
B
The flexibility of wavelengths per OADM is limited.
C
It is easier to balance Pass-Through and Add channels.
D
There is lower pass-through loss using multi-channel OADMs.
E
You can extract a single channel without dropping other channels.
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