集中監(jiān)控;集中管理;分級(jí)管理;分級(jí)維護(hù)
分組交換網(wǎng);幀中繼系統(tǒng);ATM寬帶多業(yè)務(wù)數(shù)據(jù)網(wǎng);電子信箱及傳真存儲(chǔ)轉(zhuǎn)發(fā)系統(tǒng);調(diào)制解調(diào)器;HDSL或ADSL