千兆以太網(wǎng)組網(wǎng)ppt課件-閱讀頁(yè)
2025-05-21 12:39本頁(yè)面
【正文】 1011 7 1 6 6 2 46 1500 4 Bytes O1 O0 Most Significant Octet Least Significant Octet b0 b7 LSB MSB MSB LSB 千兆以太網(wǎng) slot time 大于分組傳輸所需時(shí)間，半雙工，則在 FCS后附加填充比特。千兆以太網(wǎng)組網(wǎng) Gigabit Ether Networking David G. Cunningham William G. Lane ? 以太網(wǎng) Ether 1976 Xerox Palo Alto Research Center ? 1980年， DEC、 Intel 和 Xerox提出以太網(wǎng)協(xié)議標(biāo)準(zhǔn)。 ? 以太網(wǎng)的設(shè)計(jì)目標(biāo) (The original Ether goals) ： ? 簡(jiǎn)單 (Simplicity) ? 價(jià)格低 (Low cost) ? 兼容性 (Compatibility) ? 尋址靈活 (Addressing flexibility) ? 公平性 (Fairness) ? 先進(jìn)性 (Progress) ? 高速 (High speed) ? 低時(shí)延 (Low delay) ? 穩(wěn)定性 (Stability) ? 可維護(hù)性(Maintainability) ? 層次結(jié)構(gòu) (Layer architecture) ? 以太網(wǎng)的 (The Ether Nongoals) ?全雙工 (Fullduplex) ?差錯(cuò)控制 (Error Control) ?安全性 (Security) ?速率靈活性 (Speed Flexibility) ?優(yōu)先級(jí) (Priority) ?不設(shè)防 (Hostile User ) 以太網(wǎng)的發(fā)展進(jìn)程 (The Development of Ether) ? 10BASE5 ? 10BASE2 ? 10BROAD36 10Mbps,broadband,3600mCATV cable ? 10BASET 10Mbps,baseband,over two twistedpair cable ? 100BASET4 ? 100BASEFX ? 1000BASECX ? 1000BASELX 1000Mbps,long wavelength over optical fiber ? 1000BASESX 1000Mbps,short wavelength over optical fiber LLC Logical Link Control MAC Control ( optional ) MAC Media Access Control Reconciliation GMII PCS PMA PMD MDI Medium Media Dependent PHY Group Data Link Medium Dependent Interface IEEE 以太網(wǎng) 參考模式 Reconciliation MII PLS PMA MDI Medium Reconciliation AUI PMA MDI Medium AUI 1 10 Mbps 10 Mbps 100 1000Mbps Gigabit Ether RM MAC Client Sublayer LLC,Bridger entity MAC Control ( optional ) MAC Media Access Control Reconciliation GMII PCS PMA PMD MDI Medium Media Dependent PHY Group Physical Coding Sublayer Physical Medium Attachment Sub. Physical Medium Dependent Sub. Mdium Independent Interface Data Link Medium Dependent Interface 千兆以太參考模式 協(xié)調(diào)一致 1000 BaseX Gigabit Ether RM MAC Client Sublayer LLC,Bridger entity MAC Control ( optional ) MAC Media Access Control Reconciliation GMII PCS PMA SXPMD SXMDI 1000 BaseX PHY Mdium Independent Interface Data Link Medium Dependent Interface 協(xié)調(diào)一致 LXPMD LXMDI CXPMD CXMDI LX 光纖 SX 光纖 150 平衡銅纜 ? IEEE 1980 ? IEEE 1995 ? IEEE amp。 Pr 幀頭 10101010 .. .. .. 10101010 SD 幀開始符 .. .. 10101011 DA ,SA 1 G Lxxxxxx G = 0 單獨(dú)地址 L = 0 全局 G = 1 組地址 L = 1 局部 L 長(zhǎng)度字段 IEEE ? 1500 type 類型字段 Ether ? 1536 FCS 幀校驗(yàn)序列 公司號(hào) 網(wǎng)卡號(hào) 什么是 slottime ？ ? slottime 是沖突窗口標(biāo)準(zhǔn)所用的參數(shù)名。 用戶優(yōu)先級(jí)： 0 7 ， 7為高優(yōu)先級(jí)。 maximum run length of
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