A.城域骨干層 B.本地網(wǎng) C.城域匯聚層 D.城域接入層
A.2M話音 B.10/100M IP業(yè)務(wù) C.155M ATM業(yè)務(wù) D.GE IP業(yè)務(wù) E.34M/45M
A.320G B.640G C.40G D.1600G