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- 多项选择题 Click the Exhibit button. When designing a DWDM system with multiple amplified spans, a pre-amp is needed at Site B to （）. (Choose three.)
A、offset the OADM loss at site b
B、overcome the high multiplexer loss at site a
C、amplify signal levels after the high loss through Fiber Span 1
D、adjust add channels at site B to be at the same level as the passthrough channels
E、ensure that the per channel power is higher than the minimum needed for the post-amp at Site b
- A,C,E
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