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多选题
What two descriptions best define DWDM? ()
A

a WDM system that is compatible with EDFA technology

B

an optical technology for transmitting up to 16 channels over multiple fiber strands

C

an optical technology for transmitting up to 32 channels over multiple fiber strands

D

a technology for transmitting multiple optical signals using less sophisticated transceiver designthen CWDM

E

a technology for transmitting more closely packed optical signals using more sophisticatedtransceiver designs than CWDM


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