IC693MDL655

存儲(chǔ)轉(zhuǎn)發(fā)意味著交換機(jī)在轉(zhuǎn)發(fā)之前要收到完整的數(shù)據(jù)報(bào)文。這在交換機(jī)處理方面具有優(yōu)勢(shì)，但也帶來了潛在問題，會(huì)對(duì)延遲和可靠性產(chǎn)生負(fù)面影響：

當(dāng)數(shù)據(jù)報(bào)文經(jīng)過交換機(jī)時(shí)，會(huì)按照其長(zhǎng)度生成的延遲。如果多個(gè)交換機(jī)級(jí)聯(lián)，延遲影響會(huì)被放大。

由于交換機(jī)的存儲(chǔ)容量不是的，如果網(wǎng)絡(luò)使用過度（流量過多），它可能拒絕數(shù)據(jù)報(bào)文；這意味著可能會(huì)丟失數(shù)據(jù)報(bào)文（甚至那些優(yōu)先級(jí)較高的數(shù)據(jù)報(bào)文）。

長(zhǎng)數(shù)據(jù)報(bào)文會(huì)長(zhǎng)時(shí)間堵塞端口。

交換機(jī)級(jí)聯(lián)從一開始就給工業(yè)環(huán)境應(yīng)用帶來了挑戰(zhàn)。除了用于IT領(lǐng)域中的星型拓?fù)浣Y(jié)構(gòu)以外，自動(dòng)化領(lǐng)域也常使用線型、環(huán)型和樹型拓?fù)浣Y(jié)構(gòu)。這些經(jīng)過調(diào)整的拓?fù)浣Y(jié)構(gòu)大幅降低了以太網(wǎng)安裝的布線要求和成本。因此，在工業(yè)應(yīng)用中，采用直通式策略的雙端口交換機(jī)被整合到現(xiàn)場(chǎng)設(shè)備中。直通式意味著數(shù)據(jù)報(bào)文在被完全接收前被轉(zhuǎn)發(fā)。

IC693MDL655

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IC693MDL655