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href="http://www.cdcfah.com/cp/third-txcp_jrsbtn/">接入設(shè)備</a>?寧夏SDH設(shè)備烽火 E1板卡深圳市騰云科創(chuàng)供應(yīng)「深圳市騰云科創(chuàng)供應(yīng)」</p><div id="v23dvsz" class="leftbox clearfix"><h1>寧夏SDH設(shè)備烽火 E1板卡深圳市騰云科創(chuàng)供應(yīng)「深圳市騰云科創(chuàng)供應(yīng)」</h1><div id="ex3ro2l" class="proBig"><div id="pzubdf2" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244845105000000/3722756.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="e7o829e" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244845105000000/3722756.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="aproahw" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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>寧夏SDH設(shè)備烽火 E1板卡</p><p><span>***更新：</span>2020-08-06 18:41:49</p><p><span id="click" >瀏覽次數(shù)：2次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="wgnk8dk" 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(jī): </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="dx8cjq2" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="dx27de9" class="box"><p><p><p> SDH的概念 </p> <p> SDH[1]（Synchronous Digital Hierarchy，同步數(shù)字系列）光端機(jī)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(bào)咨詢**會(huì)（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*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(shí)現(xiàn)網(wǎng)絡(luò)有效管理、實(shí)時(shí)業(yè)務(wù)監(jiān)控、動(dòng)態(tài)網(wǎng)絡(luò)維護(hù)、不同廠商設(shè)備間的互通等多項(xiàng)功能，能**提高網(wǎng)絡(luò)資源利用率、降低管理及維護(hù)費(fèi)用、實(shí)現(xiàn)靈活可靠和***的網(wǎng)絡(luò)運(yùn)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(diǎn)，受到人們的***重視。 </p> <p> <br /> </p></p><p><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244847797656250/1749392.jpg" /></p><p><p> SDH的產(chǎn)生背景 </p> <p> SDH技術(shù)的誕生有其必然性，隨著通信的發(fā)展，要求傳送的信息不*是話音，還有文字、數(shù)據(jù)、圖像，和視頻等。加之?dāng)?shù)字通信和計(jì)算機(jī)技術(shù)的發(fā)展，在70至80年代，陸續(xù)出現(xiàn)了T1(DS1)／E1載波系統(tǒng)(1.544／2.048Mbps)、X.25幀中繼、ISDN(綜合業(yè)務(wù)數(shù)字網(wǎng)) 和FDDI(光纖分布式數(shù)據(jù)接口)等多種網(wǎng)絡(luò)技術(shù)。隨著信息社會(huì)的到來，人們希望現(xiàn)代信息傳輸網(wǎng)絡(luò)能快速、經(jīng)濟(jì)、有效地提供各種電路和業(yè)務(wù)，而上述網(wǎng)絡(luò)技術(shù)由于其業(yè)務(wù)的單調(diào)性，擴(kuò)展的復(fù)雜性，帶寬的局限性，*在原有框架內(nèi)修改或完善已無濟(jì)于事。SDH就是在這種背景下發(fā)展起來的。 </p></p><p><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244845103378907/6385040.jpg" /></p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="寧夏SDH設(shè)備烽火 E1板卡" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845105000000/3722756.jpg"></div></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/830564.html</p></div></div></div></div></div><div id="aegdfml" class="page-right twoColRt"><div id="xcum3ar" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="7l7zg37" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" 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