本特利轉(zhuǎn)速模塊3500/50 本特利轉(zhuǎn)速模塊3500/50本特利轉(zhuǎn)速模塊3500/50 早期的以太網(wǎng),多節(jié)點共享同一個傳輸媒體,稱為共享以太網(wǎng)(Shared Ethernet),節(jié)點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)送方檢測到?jīng)_突就暫停發(fā)送,隨機延遲一段時間后再重新發(fā)送直到成功。由于延遲時間是隨機的,不能事先知道,因而共享以太網(wǎng)的時間響應(yīng)具有不確定性,不能用于強實時性場合。
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