IC693UAA003RR |
IC693UAA003RR |
IC693UAA003RR |
(1)面向分組方式
ATM中采用一種小型分組(信元)來承載用戶數(shù)據(jù)。ATM的各種操作都是圍繞信元的交換和處理來設(shè)計的。
(2)采用異步時分復(fù)用方式
ATM采用了異步時分復(fù)用方式。用戶信息對帶寬的占用時動態(tài)分配的,各個用戶對傳輸帶寬統(tǒng)計地共享,因此適用于突發(fā)業(yè)務(wù)。為了防止由于異步的工作方式而導(dǎo)致的資源訪問抽歐諾個體內(nèi),ATM中大量采用了隊列來換出暫時無法獲得服務(wù)的用戶信息。
【公 司】: 廈門泰尼電氣有限公司
【主 營】: AB、GE、施耐德等各類PLC產(chǎn)品
【價 格】: 電議
【發(fā)布人】: 張亮
【電 話】: 18030028083
【所在地】: 福建 - 廈門
【座 機(jī)】: 0592-6809819
【來 源】: 供應(yīng)信息 > 電工、電氣 > PLC
【Q Q】: 2314094943
(3) 不提供逐段鏈路的差錯控制和流量控制
在鏈路(包括交換節(jié)點中的內(nèi)部鏈路)上出現(xiàn)差錯時,ATM交換節(jié)點不會進(jìn)行任何方式的差錯恢復(fù)。ATM假定網(wǎng)絡(luò)中的鏈路質(zhì)量都很高,差錯控制功能實現(xiàn)依賴于端到端的協(xié)議,這一點與電路交換是相同的。ATM交換節(jié)點也不支持鏈路上的流(Flow)的控制,系統(tǒng)中的隊列有可能因為信息的突發(fā)而溢出,導(dǎo)致信元丟失。為了防止這種丟失,ATM提供了預(yù)防性措施,那就是面向連接,并在連接建立時檢查和分配資源,使這種信元丟失概率控制在很小的范圍內(nèi)。
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