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class="ar_title"> <h1>環(huán)形拓?fù)?/h1> <div id="e286xo47mbob" class="ar_title_b"> <div id="e286xo47mbob" class="sub_title clear"> <span id="e286xo47mbob" class="sp2 c6 fl">時間：<time class="fxtime">2016-03-14 14:21:24</time></span> <span id="e286xo47mbob" class="sp1 c6 fl"><em id="zuozhe" class="noshow">林少</em><em class="user_id noshow">742</em>由 <em class="nickname"></em> 分享</span> <span id="e286xo47mbob" class="fl arc_btn"></span> </div> </div> </div> <div id="e286xo47mbob" class="y_ju"><script type="text/javascript">a("title");</script></div> <div id="e286xo47mbob" class="con_article con_main" id="contentText"> <p> 　　今天給大家?guī)憝h(huán)形拓?fù)洌切屯負(fù)湟粯?，它的結(jié)構(gòu)也很簡單，但纜線長度比較短，整體的利用率比較高，可是結(jié)構(gòu)不利于擴(kuò)充，接下來請大家關(guān)注下環(huán)形拓?fù)涞南嚓P(guān)知識</p><p> 　　環(huán)形拓?fù)?br/></p><p> 　　環(huán)形拓?fù)渚W(wǎng)絡(luò)由站點和連接站點的鏈路組成一個閉合環(huán)。每個站點能夠接收從一條鏈路傳來的數(shù)據(jù),并以同樣的速率串行地把該數(shù)據(jù)沿環(huán)送到另一端鏈路上。這種鏈路可以是單向的,也可以是雙向的。數(shù)據(jù)以分組形式發(fā)送,例如圖中的A站希望發(fā)送一個報文到C站,就先要把報文分成為若干個分組,每個分組除了數(shù)據(jù)還要加上某些控制信息,其中包括C站的地址。A站依次把每個分組送到環(huán)上,開始沿環(huán)傳輸,C站識別到帶有它自己地址的分組時,便將其中的數(shù)據(jù)復(fù)制下來。由于多個設(shè)備連接在一個環(huán)上,因此需要用分布式控制策略來進(jìn)行控制。</p><p> 　　環(huán)形拓?fù)涞膬?yōu)點</p><p> 　　(1)電纜長度短。環(huán)形拓?fù)渚W(wǎng)絡(luò)所需的電纜長度和總線拓?fù)渚W(wǎng)絡(luò)相似,但比星形拓?fù)渚W(wǎng)絡(luò)要短得多。</p><p> 　　(2)增加或減少工作站時,僅需簡單的連接操作。</p><p> 　　(3)可使用光纖。光纖的傳輸速率很高,十分適合于環(huán)形拓?fù)涞膯畏较騻鬏敗?/p><p> 　　環(huán)形拓?fù)涞娜秉c</p><p> 　　(1)節(jié)點的故障會引起全網(wǎng)故障。這是因為環(huán)上的數(shù)據(jù)傳輸要通過接在環(huán)上的每一個節(jié)點,一旦環(huán)中某一節(jié)點發(fā)生故障就會引起全網(wǎng)的故障。</p><p> 　　(2)故障檢測困難。這與總線拓?fù)湎嗨?因為不是集中控制,故障檢測需在網(wǎng)上各個節(jié)點進(jìn)行,因此就不很容易。</p><p> 　　(3)環(huán)形拓?fù)浣Y(jié)構(gòu)的媒體訪問控制協(xié)議都采用令牌傳遞的方式,在負(fù)載很輕時,信道利用率相對來說就比較低。</p> </div> <div id="e286xo47mbob" class="y_ju"><script 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