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href="http://m.cdcfah.com/cp/second-_txcp/">通信產(chǎn)品</a>?<a href="http://m.cdcfah.com/cp/third-txcp_jrsbtn/">接入設(shè)備</a>?韶關(guān)烽火780A 深圳市騰云科創(chuàng)供應(yīng)</p><div id="mahzbqh" class="leftbox clearfix"><h1>韶關(guān)烽火780A 深圳市騰云科創(chuàng)供應(yīng)</h1><div id="onkmjac" class="proBig"><div id="2frt2ue" 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="rvxphyq" 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="qvsumdk" 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>韶關(guān)烽火780A</p><p><span>***更新：</span>2020-06-07 11:17:52</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="akcj8zb" 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(xún)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(hào)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="akroqsz" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="ap3z8vc" class="box"><p><p> SDH的復(fù)用包括兩種情況： </p> <p> 1、由STM-1信號(hào)復(fù)用成STM-N信號(hào) </p> <p> 復(fù)用的方法主要通過(guò)字節(jié)間插的同步復(fù)用方式來(lái)完成的，復(fù)用的基數(shù)是4，即4×STM-1→STM-4，4×STM-4→STM-16。在復(fù)用過(guò)程中保持幀頻不變（8000幀/秒），這就意味著高一級(jí)的STM-N信號(hào)是低一級(jí)的STM-n信號(hào)速率的4倍。 </p> <p> 在進(jìn)行字節(jié)間插復(fù)用過(guò)程中，各幀的信息凈負(fù)荷和指針字節(jié)按原值進(jìn)行字節(jié)間插復(fù)用，而STM-N的段開(kāi)銷(xiāo)并不是由所有低階STM-N幀中的段開(kāi)銷(xiāo)間插復(fù)用而成，而是舍棄了某些低階幀中的段開(kāi)銷(xiāo)。 </p> <p> 2、由PDH支路信號(hào)復(fù)用成STM-N信號(hào) </p> <p> 各種PDH支路信號(hào)復(fù)用進(jìn)STM-N幀的過(guò)程都要經(jīng)歷映射、定位，韶關(guān)烽火780A、復(fù)用三個(gè)步驟。映射相當(dāng)于信號(hào)打包，定位伴隨與指針調(diào)整，復(fù)用相當(dāng)于字節(jié)間插復(fù)用。ITU-T規(guī)定了一整套完整的映射復(fù)用結(jié)構(gòu)，也就是映射復(fù)用路線，通過(guò)這些路線可將PDH的3個(gè)系列的數(shù)字信號(hào)以多種方法復(fù)用成STM-N信號(hào)。 </p> <p> 復(fù)用結(jié)構(gòu)包括了一些基本的復(fù)用單元：C－容器、VC－虛容器、TU－支路單元，韶關(guān)烽火780A、TUG－支路單元組、AU－管理單元，韶關(guān)烽火780A、AUG－管理單元組，這些復(fù)用單元的下標(biāo)表示與此復(fù)用單元相應(yīng)的信號(hào)級(jí)別。 </p> <p> 從一個(gè)有效負(fù)荷到STM-N的復(fù)用路線不是***的，有多條路線（也就是說(shuō)有多種復(fù)用方法），8Mbit/s的PDH支路信號(hào)是無(wú)法復(fù)用成STM-N信號(hào)的。 </p> <p> <br /> </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="韶關(guān)烽火780A" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845105000000/3722756.jpg"></div><p> 樹(shù)形網(wǎng) </p> <p> <br /> </p> <p> 樹(shù)形網(wǎng)絡(luò)拓?fù)淇煽闯墒擎溞瓮負(fù)浜托切瓮負(fù)涞慕Y(jié)合。 </p> <p> <br /> </p> <p> 環(huán)形網(wǎng) </p> <p> <br /> </p> <p> 環(huán)形網(wǎng)拓?fù)鋵?shí)際上是指將鏈形拓?fù)涫孜蚕噙B，從而使網(wǎng)上任何一個(gè)網(wǎng)元節(jié)點(diǎn)都不對(duì)外開(kāi)放的網(wǎng)絡(luò)拓?fù)湫问健＿@是當(dāng)前使用**多的網(wǎng)絡(luò)拓?fù)湫问?，主要是因?yàn)樗哂泻軓?qiáng)的生存性，即自愈功能較強(qiáng)。 </p> <p> <br /> </p> <p> 網(wǎng)孔形網(wǎng) </p> <p> <br /> </p> <p> 將所有網(wǎng)元節(jié)點(diǎn)兩兩相連，就形成了網(wǎng)孔形網(wǎng)絡(luò)。這種網(wǎng)絡(luò)拓?fù)錇閮删W(wǎng)元節(jié)點(diǎn)間提供多個(gè)傳輸路由，使網(wǎng)絡(luò)的可靠更強(qiáng)。但是由于系統(tǒng)的冗余度高，必會(huì)使系統(tǒng)有效性降低，成本高且結(jié)構(gòu)復(fù)雜。 </p> <p> <br /> </p> <p> 當(dāng)前用得**多的網(wǎng)絡(luò)拓?fù)涫擎溞魏铜h(huán)形，通過(guò)它們的靈活組合，可構(gòu)成更加復(fù)雜的網(wǎng)絡(luò)。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="韶關(guān)烽火780A" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845101689454/9165528.jpg"></div><p> STM-N的幀結(jié)構(gòu)由3部分組成： </p> <p> 1、信息凈負(fù)荷（payload）。 </p> <p> 信息凈負(fù)荷位于STM-N幀中第1到第9行，第9×N+1到第270×N列，共9×261×N個(gè)字節(jié)。信息凈負(fù)荷是在STM-N幀結(jié)構(gòu)中存放將由STM-N傳送的各種用戶(hù)信息碼塊的地方。 </p> <p> 為了實(shí)時(shí)監(jiān)測(cè)貨物（打包的低速信號(hào)）在傳輸過(guò)程中是否有損壞，在將低速信號(hào)打包的過(guò)程中加入了通道開(kāi)銷(xiāo)（POH）字節(jié)。POH作為凈負(fù)荷的一部分與信息碼塊一起裝載在STM-N這輛貨車(chē)上在SDH網(wǎng)中傳送，它負(fù)責(zé)對(duì)打包的貨物（低速信號(hào)）進(jìn)行通道性能監(jiān)視、管理和控制。 </p> <p> 2、段開(kāi)銷(xiāo)（SOH） </p> <p> 段，相當(dāng)于一條大的傳輸通道，段開(kāi)銷(xiāo)是為了保證信息凈負(fù)荷正常傳送所必須附加的網(wǎng)絡(luò)運(yùn)行、管理和維護(hù)（OAM）字節(jié)。也就是說(shuō)SOH完成對(duì)貨物整體的監(jiān)控，POH是完成對(duì)某一件特定的貨物進(jìn)行監(jiān)控，當(dāng)然，SOH和POH還有一些其他管理功能。 </p> <p> 段開(kāi)銷(xiāo)又分為再生段開(kāi)銷(xiāo)（RSOH）和復(fù)用段開(kāi)銷(xiāo)（MSOH），可分別對(duì)相應(yīng)的段層進(jìn)行監(jiān)控，二者的區(qū)別在于監(jiān)管的范圍不同。 </p> <p> 3、管理單元指針（AU-PTR） </p> <p> 管理單元指針位于STM-N幀中第4行的***到第9×N列，共9×N個(gè)字節(jié)。AU-PTR是用來(lái)指示信息凈負(fù)荷的***個(gè)字節(jié)在STM-N幀內(nèi)的準(zhǔn)確位置的指示符，以便接收端能根據(jù)這個(gè)位置指示符的值（指針值）準(zhǔn)確分離信息凈負(fù)荷。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="韶關(guān)烽火780A" src="https://tyunfile.71360.com/UploadFile/sztykc/637244847603603516/458709.jpg"></div></p><br /><p>文章來(lái)源地址: http://m.cdcfah.com/cp/179334.html</p></div></div></div></div></div><div id="pebt8lx" class="page-right twoColRt"><div id="cr77ln2" class="box01 margin10 clearfix"><h3><a href="http://m.cdcfah.com/cp/">猜你喜歡</a></h3><div id="dczfc24" 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(qiáng) 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