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src="https://tyunfile.71360.com/UploadFile/sztykc/637244845101689454/9165528.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="gfc33qi" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244845101689454/9165528.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="yxu2jst" 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(guān)鍵詞：</span>嘉定區(qū)烽火8路帶交換功能快速以太網(wǎng)處理板</p><p><span>***更新：</span>2020-06-08 06:20:27</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="lur7z22" 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(dāng)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="f8h2cmd" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="yn3z7da" class="box"><p><p> STM-N信號幀的重復(fù)頻率（也就是每秒傳送的幀數(shù)）是多少呢？ITU-T規(guī)定對于任何級別的STM-N幀，幀頻都是8000幀/秒，也就是幀的周期為恒定的125μs ，幀中每個字節(jié)提供的通道速率是64Kbit/s。 </p> <p> <br /> </p> <p> 由于幀周期的恒定使STM-N信號的速率有其規(guī)律性，例如STM-4的傳輸數(shù)速恒定的等于STM-1信號傳輸數(shù)速的4倍，嘉定區(qū)烽火8路帶交換功能快速以太網(wǎng)處理板，STM-16恒定等于STM-1的16倍。而PDH中的E2信號速率≠E1信號速率的4倍。 </p> <p> STM-N信號幀的重復(fù)頻率（也就是每秒傳送的幀數(shù)）是多少呢？ITU-T規(guī)定對于任何級別的STM-N幀，幀頻都是8000幀/秒，也就是幀的周期為恒定的125μs ，幀中每個字節(jié)提供的通道速率是64Kbit/s，嘉定區(qū)烽火8路帶交換功能快速以太網(wǎng)處理板。 </p> <p> <br /> </p> <p> 由于幀周期的恒定使STM-N信號的速率有其規(guī)律性，例如STM-4的傳輸數(shù)速恒定的等于STM-1信號傳輸數(shù)速的4倍，嘉定區(qū)烽火8路帶交換功能快速以太網(wǎng)處理板，STM-16恒定等于STM-1的16倍。而PDH中的E2信號速率≠E1信號速率的4倍。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="嘉定區(qū)烽火8路帶交換功能快速以太網(wǎng)處理板" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845101689454/9165528.jpg"></div><p> 環(huán)網(wǎng)——自愈環(huán) </p> <p> 自愈環(huán)的分類 </p> <p> 目前環(huán)形網(wǎng)絡(luò)的拓?fù)浣Y(jié)構(gòu)用得很多，因為環(huán)形網(wǎng)具有較強的自愈功能。自愈環(huán)的分類可按保護(hù)的業(yè)務(wù)級別、環(huán)上業(yè)務(wù)的方向、網(wǎng)元節(jié)點間光纖數(shù)等來劃分。 </p> <p> 按環(huán)上業(yè)務(wù)的方向可將自愈環(huán)分為單向環(huán)和雙向環(huán)兩大類；按網(wǎng)元節(jié)點間的光纖數(shù)可將自愈環(huán)劃分為兩纖環(huán)（一對收/發(fā)光纖）和四纖環(huán)（兩對收發(fā)光纖）；按保護(hù)方式還可將自愈環(huán)劃分為通道保護(hù)環(huán)和復(fù)用段保護(hù)環(huán)兩大類。 </p> <p> 對于通道保護(hù)環(huán)，業(yè)務(wù)的保護(hù)是以通道為基礎(chǔ)的，也就是保護(hù)的是STM-N信號中的某個VC通道，根據(jù)環(huán)上的某一個別通道信號的傳輸質(zhì)量來決定是否倒換，通常利用收端是否收到簡單的AIS信號來決定該通道是否應(yīng)進(jìn)行倒換。 </p> <p> 復(fù)用段倒換環(huán)是以復(fù)用段為基礎(chǔ)的，根據(jù)環(huán)上傳輸?shù)膹?fù)用段信號的質(zhì)量決定是否倒換。倒換是由K1、K2（b1～b5）字節(jié)所攜帶的APS協(xié)議來啟動的。復(fù)用段保護(hù)倒換的觸發(fā)條件是LOF、LOS、MS-AIS告警信號。 </p> <p> 通道保護(hù)環(huán)的倒換無需APS協(xié)議，采用“并發(fā)優(yōu)收”的倒換機理---簡單。 </p> <p> 復(fù)用段保護(hù)環(huán)要使用APS協(xié)議，倒換機理---較復(fù)雜。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="嘉定區(qū)烽火8路帶交換功能快速以太網(wǎng)處理板" src="https://tyunfile.71360.com/UploadFile/sztykc/637244847651777344/7289118.jpg"></div><p> SDH的概念 </p> <p> SDH[1]（Synchronous Digital Hierarchy，同步數(shù)字系列）光端機容量較大，一般是16E1到4032E1。 SDH是一種將復(fù)接、線路傳輸及交換功能融為一體、并由統(tǒng)一網(wǎng)管系統(tǒng)操作的綜合信息傳送網(wǎng)絡(luò)，是美國貝爾通信技術(shù)研究所提出來的同步光網(wǎng)絡(luò)（SONET）。國際電話電報咨詢**會（CCITT）（現(xiàn)ITU-T）于1988年接受了SONET 概念并重新命名為SDH，使其成為不僅適用于光纖也適用于微波和衛(wèi)星傳輸?shù)耐ㄓ眉夹g(shù)體制。它可實現(xiàn)網(wǎng)絡(luò)有效管理、實時業(yè)務(wù)監(jiān)控、動態(tài)網(wǎng)絡(luò)維護(hù)、不同廠商設(shè)備間的互通等多項功能，能**提高網(wǎng)絡(luò)資源利用率、降低管理及維護(hù)費用、實現(xiàn)靈活可靠和***的網(wǎng)絡(luò)運行與維護(hù)，因此是當(dāng)今世界信息領(lǐng)域在傳輸技術(shù)方面的發(fā)展和應(yīng)用的熱點，受到人們的***重視。 </p> <p> <br /> </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="嘉定區(qū)烽火8路帶交換功能快速以太網(wǎng)處理板" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845101689454/4175838.jpg"></div></p><br /><p>文章來源地址: http://m.cdcfah.com/cp/186590.html</p></div></div></div></div></div><div id="d783tan" class="page-right twoColRt"><div id="d8rtkht" class="box01 margin10 clearfix"><h3><a href="http://m.cdcfah.com/cp/">猜你喜歡</a></h3><div id="t3q2spr" 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(yīng)" 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