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href="http://m.cdcfah.com/cp/third-txcp_jrsbtn/">接入設(shè)備</a>?廣州烽火180 深圳市騰云科創(chuàng)供應(yīng)</p><div id="m2v8uzd" class="leftbox clearfix"><h1>廣州烽火180 深圳市騰云科創(chuàng)供應(yīng)</h1><div id="qf4yxjl" class="proBig"><div id="xh9g7bn" class="bigimg"><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 id="zix3wyk" 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="2f7onzb" 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>廣州烽火180</p><p><span>***更新：</span>2020-06-07 10:27:04</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="j2t8pmt" 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="b7b4sph" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="mw9vxya" class="box"><p><p> 在各種寬帶光纖接入網(wǎng)技術(shù)中，采用了SDH技術(shù)的接入網(wǎng)系統(tǒng)是應(yīng)用**普遍的。SDH的誕生解決了由于入戶媒質(zhì)的帶寬限制而跟不上骨干網(wǎng)和用戶業(yè)務(wù)需求的發(fā)展,而產(chǎn)生了用戶與**網(wǎng)之間的接入"瓶頸"的問題，同時提高了傳輸網(wǎng)上大量帶寬的利用率。SDH技術(shù)自從90年代引入以來，廣州烽火180，至今已經(jīng)是一種成熟、標(biāo)準(zhǔn)的技術(shù)，在骨干網(wǎng)中被***采用，廣州烽火180，廣州烽火180，且價格越來越低，在接入網(wǎng)中應(yīng)用可以將SDH技術(shù)在**網(wǎng)中的巨大帶寬優(yōu)勢和技術(shù)優(yōu)勢帶入接入網(wǎng)領(lǐng)域，充分利用SDH同步復(fù)用、標(biāo)準(zhǔn)化的光接口、強(qiáng)大的網(wǎng)管能力、靈活網(wǎng)絡(luò)拓?fù)淠芰透呖煽啃詭砗锰?，在接入網(wǎng)的建設(shè)發(fā)展中長期受益。 </p> <p> <br /> </p> <p> <br /> </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="廣州烽火180" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845101689454/9165528.jpg"></div><p> SDH的特點(diǎn) </p> <p> 1）SDH傳輸系統(tǒng)在國際上有統(tǒng)一的幀結(jié)構(gòu)數(shù)字傳輸標(biāo)準(zhǔn)速率和標(biāo)準(zhǔn)的光路接口，使網(wǎng)管系統(tǒng)互通，因此有很好的橫向兼容性，它能與現(xiàn)有的PDH完全兼容，并容納各種新的業(yè)務(wù)信號，形成了全球統(tǒng)一的數(shù)字傳輸體制標(biāo)準(zhǔn)，提高了網(wǎng)絡(luò)的可靠性； </p> <p> （2）SDH接入系統(tǒng)的不同等級的碼流在幀結(jié)構(gòu)凈負(fù)荷區(qū)內(nèi)的排列非常有規(guī)律，而凈負(fù)荷與網(wǎng)絡(luò)是同步的，它利用軟件能將高速信號一次直接分插出低速支路信號，實(shí)現(xiàn)了一次復(fù)用的特性，克服了PDH準(zhǔn)同步復(fù)用方式對全部高速信號進(jìn)行逐級分解然后再生復(fù)用的過程，由于**簡化了DXC，減少了背靠背的接口復(fù)用設(shè)備，改善了網(wǎng)絡(luò)的業(yè)務(wù)傳送透明性； </p> <p> （3）由于采用了較先進(jìn)的分插復(fù)用器（ADM）、數(shù)字交叉連接（DXC）、網(wǎng)絡(luò)的自愈功能和重組功能就顯得非常強(qiáng)大，具有較強(qiáng)的生存率。因SDH幀結(jié)構(gòu)中安排了信號的5％開銷比特，它的網(wǎng)管功能顯得特別強(qiáng)大，并能統(tǒng)一形成網(wǎng)絡(luò)管理系統(tǒng)，為網(wǎng)絡(luò)的自動化、智能化、信道的利用率以及降低網(wǎng)絡(luò)的維管費(fèi)和生存能力起到了積極作用； </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="廣州烽火180" src="https://tyunfile.71360.com/UploadFile/sztykc/637244847603603516/458709.jpg"></div><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，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。 </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，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="廣州烽火180" src="https://tyunfile.71360.com/UploadFile/sztykc/637244847651777344/7289118.jpg"></div></p><br /><p>文章來源地址: http://m.cdcfah.com/cp/178637.html</p></div></div></div></div></div><div id="2h9g7cz" class="page-right twoColRt"><div id="cw42r2a" class="box01 margin10 clearfix"><h3><a href="http://m.cdcfah.com/cp/">猜你喜歡</a></h3><div id="y8ixjbx" class="recomPic likePro"><a href="http://m.cdcfah.com/cp/814588.html"><div><img 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