A.窄帶業(yè)務(wù)單元NSU B.寬帶業(yè)務(wù)單元BSU C.多業(yè)務(wù)單元MSU D.通用業(yè)務(wù)單元VSU
A.ME60-16 B.ME60-8 C.ME60-4 D.ME60-2