A.10dB B.10dBm C.20dB D.20dBm
A.0.5%,1% B.0.05%,0.1% C.0.01%,0.05% D.0.1%,0.5%
A.擴展架和Multidrop機架都不需要DXU B.擴展架不需要DXU,而Multidrop機架需要DXU C.擴展架和Multidrop機架都需要DXU D.擴展架需要DXU,而Multidrop機架不需要DXU