A.出局用戶電纜對(duì)數(shù) B.直接進(jìn)局的用戶架空明線對(duì)數(shù) C.局間中繼用線對(duì)數(shù) D.長(zhǎng)途中繼用線對(duì)數(shù)
A.就是主干電纜線對(duì)利用率 B.是指本地電話局用交換機(jī)配線架上連接妥當(dāng)(成端)的全部出局用戶線實(shí)占對(duì)數(shù)的利用率 C.等于空閑線對(duì)數(shù)÷主干電纜線對(duì)數(shù)×100% D.等于已用主干電纜線對(duì)數(shù)÷主干電纜線對(duì)數(shù)×100%
A.ONU設(shè)備 B.城域網(wǎng)路由器 C.DSLAM設(shè)備 D.LAN交換機(jī)