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CACR-HR05BAB11
早期的以太網(wǎng)，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(lái)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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廈門岳航自動(dòng)化設(shè)備有限公司
CACR-HR05BAB11
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