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class="pic"><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244847797656250/1749392.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="kzlda9h" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244847797656250/1749392.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="a7e334h" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>廣東省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關鍵詞：</span>金山區(qū)烽火STM-1</p><p><span>***更新：</span>2020-06-17 00:30:38</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="nb3b39a" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">深圳市騰云科創(chuàng)信息咨詢有限公司</a></p><p><span>聯(lián)系人：</span>夏永 </p><p><span>郵箱: </span>87993378@qq.com</p><p><span>電話: </span>16625147809</p><p><span>傳真: </span>1550_</p><p><span>網(wǎng)址: </span></p><p><span>手機: </span>1550-2042477</p><p><span>地址: </span>沙井街道蠔四社區(qū)街尾塘一巷5號幸福家園A棟、B棟、C棟、D棟D棟110D</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="tcz2lx3" class="page-proshow02"><p class="title">詳細說明</p><div id="vpbxo9s" class="box"><p><p><p> STM-N信號幀結構的安排應盡可能使支路低速信號在一幀內(nèi)均勻、有規(guī)律的分布，以便于從高速信號中直接上/下低速支路信號。因此，ITU-T規(guī)定了STM-N的幀是以字節(jié)為單位的矩形塊狀結構。 </p> <p> STM-N的信號是9行×270×N列的幀結構。此處的N與STM-N的N相一致，取值范圍：1，4，16，64……。表示此信號由N個STM-1 信號通過字節(jié)間插復用而成。由此可知，STM-1信號的幀結構是9行×270列的塊狀幀。并且，當N個STM-1信號通過字節(jié)間插復用成STM-N信號時，**是將STM-1信號的列按字節(jié)間插復用，行數(shù)恒定為9行不變。 </p> <p> 我們知道，信號在線路上串行傳輸時是逐個比特（bit）地進行的，那么這個塊狀幀是怎樣在線路上進行傳輸?shù)哪兀?STM-N信號的傳輸也遵循按比特的傳輸方式，SDH信號幀傳輸?shù)脑瓌t是：按幀結構的順序從左到右，從上到下逐個字節(jié)，并且逐個比特地傳輸，傳完一行再傳下一行，傳完一幀再傳下一幀。 </p> <p> <br /> </p></p><p><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244847651777344/7289118.jpg" /></p><p><p> STM-N信號幀結構的安排應盡可能使支路低速信號在一幀內(nèi)均勻、有規(guī)律的分布，以便于從高速信號中直接上/下低速支路信號。因此，ITU-T規(guī)定了STM-N的幀是以字節(jié)為單位的矩形塊狀結構。 </p> <p> STM-N的信號是9行×270×N列的幀結構。此處的N與STM-N的N相一致，取值范圍：1，4，16，64……。表示此信號由N個STM-1 信號通過字節(jié)間插復用而成。由此可知，STM-1信號的幀結構是9行×270列的塊狀幀。并且，當N個STM-1信號通過字節(jié)間插復用成STM-N信號時，**是將STM-1信號的列按字節(jié)間插復用，行數(shù)恒定為9行不變。 </p> <p> 我們知道，信號在線路上串行傳輸時是逐個比特（bit）地進行的，那么這個塊狀幀是怎樣在線路上進行傳輸?shù)哪兀?STM-N信號的傳輸也遵循按比特的傳輸方式，SDH信號幀傳輸?shù)脑瓌t是：按幀結構的順序從左到右，從上到下逐個字節(jié)，并且逐個比特地傳輸，傳完一行再傳下一行，傳完一幀再傳下一幀。 </p> <p> <br /> </p></p><p><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244847651777344/7289118.jpg" /></p><p>根據(jù)電力通信點多面廣, 可靠性要求高的特點, 主干傳輸網(wǎng)可采用光纖自愈環(huán)的網(wǎng)絡拓撲結構, 也可以采用雙環(huán)相切、多環(huán)相切的主干網(wǎng)絡拓撲結構, 采用相切環(huán)時可在兩環(huán)相切的節(jié)點上采用雙環(huán)網(wǎng)元設備交叉保護, 克服雙環(huán)相切時節(jié)點保護可靠性差的問題。支路可根據(jù)實際需要采用鏈形、星形、樹形等結構。另外, 采用SDH 設備的光纖自愈環(huán)可實現(xiàn)多種形式的通道保護, 而且SDH 光纖環(huán)有較強的自愈能力。所謂自愈就是指在網(wǎng)絡發(fā)生故障(例如光纖斷裂)時, 無需人為干預, 網(wǎng)絡能在極短的時間內(nèi)( ITU 2T規(guī)定為50ms 以內(nèi)) 自動恢復傳輸, 使用戶幾乎感覺不到網(wǎng)絡出了故障。傳統(tǒng)的組網(wǎng)概念中, 提高傳輸設備利用率是**關鍵的, 為了增加線路的占空系數(shù), 在每個節(jié)點都建立了許多直接通道, 致使網(wǎng)絡結構非常復雜。而利用SDH組網(wǎng), 使用SDH提供的豐富的開銷字節(jié), 就可以極大簡化網(wǎng)絡結構, 實現(xiàn)強大的OAM功能, 降低傳輸費用并支持新業(yè)務的發(fā)展, 這正符合了現(xiàn)代通信發(fā)展的目標。</p><p><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244845101689454/4175838.jpg" /></p><p>深圳騰云科創(chuàng)信息咨詢有限公司，成立于2015年專業(yè)從事通信產(chǎn)品購銷以及施工，維護，產(chǎn)品維修，計算機系統(tǒng)集成施工。公司擁有專業(yè)的技術團隊，由廠家(中興通訊，華為技術，烽火通信)服務10年以上從業(yè)經(jīng)驗的技術****，并有多名專業(yè)技術人員為您提供專業(yè)的商務技術和專業(yè)解決方案。公司主營中興通訊及華為技術各系列產(chǎn)品板件及整套設備的銷售與安裝，設備維護及板件返修，以及各設備可配置的單板，用戶電纜，中繼電纜等。公司業(yè)務涉及交通、金融、教育、衛(wèi)生、科研等系統(tǒng)已經(jīng)建立了牢固的業(yè)務合作伙伴關系。積極面向市場為廣大行業(yè)用戶提供設計、安裝、調(diào)試、培訓、維護的“一條龍"服務。本公司以質量的服務、良好的信譽、雄厚的技術力量為廣大客戶提供質量服務。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="金山區(qū)烽火STM-1" src="https://tyunfile.71360.com/UploadFile/sztykc/637244847797656250/1749392.jpg"></div></p><br /><p>文章來源地址: http://m.cdcfah.com/cp/283310.html</p></div></div></div></div></div><div id="yhjqcbh" class="page-right twoColRt"><div id="mvxzbag" class="box01 margin10 clearfix"><h3><a href="http://m.cdcfah.com/cp/">猜你喜歡</a></h3><div id="8khjazg" class="recomPic likePro"><a href="http://m.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強信息推薦自業(yè)物資供應" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強信息推薦自業(yè)物資供應</p></a></div><div id="dhy8cst" class="recomPic likePro"><a href="http://m.cdcfah.com/cp/846569.html"><div><img src="https://tyunfile.71360.com/WaterMark/UploadFile/nbzxsw/637298235378037109/764794.png" alt="寧波寧海直接考A2有幾個科目真誠推薦寧波助學商務信息咨詢供應" class="vcenter" 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