電腦通訊網(wǎng)路2(已修改)
2025-10-09 17:40 本頁面
【正文】 1 電腦通訊網(wǎng)路 (2) NCU MWNL CSMA/CD2 IEEE Carrier Sense Multiple Access with Collision Detection (CSMA/CD) NCU MWNL CSMA/CD3 Typical CSMA/CD Network A C E B D F 同軸電纜 收發(fā)器電纜 終端器 終端器 收發(fā)器 NCU MWNL CSMA/CD4 IEEE Architecture 應(yīng)用層 表達(dá)層 會議層 傳輸層 網(wǎng)路層 鏈結(jié)層 實體層 OSI參考模式 媒介擷取控制 邏輯鏈結(jié)控制 LLC (IEEE ) MAC (IEEE ) PLS 實體層訊號處理 高層通訊協(xié)定 (IP, TCP, HTTP, FTP, SMTP, etc.,) CSMA/CD 傳輸媒介 PMA MAU AUI MDI NCU MWNL CSMA/CD5 CSMA/CD Protocol ? Carrier Sense before transmission ? Carrier Sense while transmission ? Collision: Two or more stations transmitting simultaneously ? Backoff: Random delay after collision ? Deference: Defers transmission if channel is sensed busy ? Collision Window (Slot time): Roundtrip propagation delay time plus some carrier sense time. In
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