MC-4/11/03/400 MC-4/11/03/400
多節(jié)點(diǎn)共享同一個(gè)傳輸媒體,稱為共享以太網(wǎng)(Shared Ethernet),節(jié)點(diǎn)間通信采用廣播方式,易發(fā)生沖突。共享以太網(wǎng)用CSMA/CD技術(shù)來避免沖突,即發(fā)送方檢測(cè)到?jīng)_突就暫停發(fā)送,隨機(jī)延遲一段時(shí)間后再重新發(fā)送直到成功。由于延遲時(shí)間是隨機(jī)的,不能事先知道,因而共享以太網(wǎng)的時(shí)間響應(yīng)具有不確定性,不能用于強(qiáng)實(shí)時(shí)性場(chǎng)合。
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