山西烽火180 深圳市騰云科創(chuàng)供應-b2b網(wǎng)站_b2b電子商務平臺【買產(chǎn)品】-上?？谄蚴称酚邢薰?/title><meta name="description" content="二纖雙向復用段保護環(huán)將每根光纖的前一半時隙傳送主用業(yè)務，后一半時隙傳送額外業(yè)務，也就是說一根光纖的保護時隙用來保護另一根光纖上的主用業(yè)務。業(yè)務容量為四纖雙向復用段保護環(huán)的1/2，即M/2（STM-N），其中M是節(jié)點數(shù)。它在組網(wǎng)中使用得較多，"><meta name="keywords" content="山西烽火180,烽火"><link rel="canonical" href="http://m.cdcfah.com/"/><meta name="applicable-device" content="pc"><link rel="shortcut icon" href="/static/new_net_01/images/favicon.ico"><link rel="stylesheet" href="/static/new_net_01/css/slick.css" /><link rel="stylesheet" href="/static/new_net_01/css/addnew.css"><link rel="stylesheet" href="/static/new_net_01/css/sidenav.css"><link rel="stylesheet" href="/static/new_net_01/css/style.css" /><link rel="stylesheet" href="/static/new_net_01/css/tab.css"><link rel="stylesheet" href="/static/new_net_01/css/404.css"> <meta name="baidu-site-verification" content="OBVzrC9aaQ" /> <meta http-equiv="Cache-Control" content="no-transform" /> <meta 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深圳市騰云科創(chuàng)供應</h1><div id="pt2dfct" class="proBig"><div id="fe2asu7" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244845105136719/8556415.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="d7f4hyq" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244845105136719/8556415.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="pecmeld" 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>山西烽火180,烽火</p><p><span>***更新：</span>2020-07-26 19:17:27</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="blifhjq" 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="mbdasew" class="page-proshow02"><p class="title">詳細說明</p><div id="3hrtqxu" class="box"><p><p> 二纖雙向復用段保護環(huán)將每根光纖的前一半時隙傳送主用業(yè)務，后一半時隙傳送額外業(yè)務，也就是說一根光纖的保護時隙用來保護另一根光纖上的主用業(yè)務。業(yè)務容量為四纖雙向復用段保護環(huán)的1/2，即M/2（STM-N），其中M是節(jié)點數(shù)。它在組網(wǎng)中使用得較多，主要用于622M和2.5G系統(tǒng)，也是適用于業(yè)務分散的網(wǎng)絡。 </p> <p> 二纖單向通道保護環(huán)和二纖雙向復用段保護環(huán)的比較 </p> <p> 業(yè)務容量（*考慮主用業(yè)務） </p> <p> 單向通道保護環(huán)的比較大業(yè)務容量是STM-N，山西烽火180，二纖雙向復用段保護環(huán)的業(yè)務容量為M/2 ×STM-N（M是環(huán)上節(jié)點數(shù)）。 </p> <p> 復雜性 </p> <p> 二纖單向通道保護環(huán)，無論從實現(xiàn)控制的復雜性，還是設備的開發(fā)和制作難度來說，都是各種倒換環(huán)中**簡單的，山西烽火180。由于它不涉及APS的協(xié)議處理過程，山西烽火180，因而業(yè)務倒換時間也**短。二纖雙向復用段保護環(huán)的控制邏輯和設備開發(fā)制作則是各種倒換環(huán)中**復雜的。 </p> <p> 兼容性分/插復用器用于SDH傳輸網(wǎng)絡的轉接站點處。山西烽火180</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="山西烽火180,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845105136719/8556415.jpg"></div><p> SDH網(wǎng)絡的常見網(wǎng)元和功能 </p> <p> ADM——分/插復用器 </p> <p> 分/插復用器用于SDH傳輸網(wǎng)絡的轉接站點處，例如鏈的中間結點或環(huán)上結點，是SDH網(wǎng)上使用**多、**重要的一種網(wǎng)元，它是一個三端口的器件。 </p> <p> ADM有兩個線路端口和一個支路端口。兩個線路端口各接一側的光纜（每側收/發(fā)共兩根光纖），為了描述方便我們將其分為西（W）向、東向（E）兩個線路端口。ADM的作用是將低速支路信號交叉復用進東或西向線路上去，或從東或西側線路端口收的線路信號中拆分出低速支路信號。另外，還可將東/西向線路側的STM-N信號進行交叉連接，例如將東向STM-16中的3#STM-1與西向STM-16中的15#STM-1相連接。 </p> <p> ADM是SDH**重要的一種網(wǎng)元，通過它可等效成其它網(wǎng)元，即能完成其它網(wǎng)元的功能，例如：一個ADM可等效成兩個TM。奉賢區(qū)烽火PEOW管理單元指針位于STM-N幀中第4行的***到第9×N列。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="山西烽火180,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845103808594/6520524.jpg"></div><p> SDH多業(yè)務傳送平臺 </p> <p> 電力**網(wǎng)的組網(wǎng), 不*要求通信網(wǎng)絡選擇適當?shù)木W(wǎng)絡拓撲, 使整個網(wǎng)絡具有高可靠性, 而且要求其能大容量、高質量、高速率地進行多業(yè)務傳輸, 既使整個通信系統(tǒng)在電力系統(tǒng)內(nèi)部暢通無阻, 又要與外界公共網(wǎng)聯(lián)系十分方便, 甚至與國際通信網(wǎng)接軌。 </p> <p> 傳統(tǒng)SDH在接入和傳送寬帶數(shù)據(jù)業(yè)務時無法直接提供在局域網(wǎng)中占統(tǒng)治地位的以太網(wǎng)接口; 無法支持統(tǒng)計復用和有效使用傳輸帶寬; 沒有帶寬靈活的容器裝載寬帶數(shù)據(jù)業(yè)務。為了能較好地發(fā)展, 采用基于SDH 的多業(yè)務傳送平臺(MSTP)。它利用EOS (Ethernet over SDH ) 技術, 解決SDH 平臺上 </p> <p> 以太網(wǎng)業(yè)務的接入和傳送應用,支持端口捆綁( IEEE802. 3ad) 和生成樹算法( IEEE802.1D) , 支持VLAN ( IEEE802. 1Q ) 和QoS ( IEEE802.1p ) , 可以直接提供10Mb/100Mb自適應以太網(wǎng)接口, 通過內(nèi)置2 層、3 層以太網(wǎng)交換機實現(xiàn)統(tǒng)計復用, 并且支持VC212 虛級聯(lián), 帶寬從1～ 48 個2M b平滑設置。 </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 /> 網(wǎng)絡的有效性、可靠性和經(jīng)濟性在很大程度上與其拓撲結構有關。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="山西烽火180,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845101689454/9165528.jpg"></div><p> <p> <p> 從技術上來看，接入層的相對帶寬需求較小，需要提供IP、TDM，可能還有ATM等綜合業(yè)務傳送。以SDH 系統(tǒng)為基礎并能夠提供IP 、ATM 傳送與處理的系統(tǒng)（包括TDM、IP與ATM接口，甚至包括IP 和ATM 交換模塊）將是解決接入層傳送的主要方法，這種方式可廉價地在一個業(yè)務提供點（POP）上提供高質量專線、ATM 、IP 等業(yè)務的接入、傳送和保護。 </p> <p> 隨著骨干傳輸容量不斷增大，城域傳輸網(wǎng)絡的接入能力也多樣化。但以IP為主的網(wǎng)絡業(yè)務仍然是不可預知的，這需要傳輸網(wǎng)絡具有更好的自適應能力，而這種自適應能力不**是網(wǎng)絡接口或網(wǎng)絡容量的適應能力，而且要求網(wǎng)絡連接的自適應能力?？偟膩碚f，低成本、靈活快速的完成運營商端局到用戶端的業(yè)務接入和業(yè)務收斂是對未來城域網(wǎng)接入系統(tǒng)的主要需求。 </p> </p> <p> <br /> </p> </p> <p> <br /> SDH并不專屬于某種傳輸介質，它可用于雙絞線、同軸電纜。茂名烽火NMU</p><p style="text-indent:25px">樹形網(wǎng)絡拓撲可看成是鏈形拓撲和星形拓撲的結合。山西烽火180</p><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，是美國貝爾通信技術研究所提出來的同步光網(wǎng)絡（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*適用于光纖也適用于微波和衛(wèi)星傳輸?shù)耐ㄓ眉夹g體制。它可實現(xiàn)網(wǎng)絡有效管理、實時業(yè)務監(jiān)控、動態(tài)網(wǎng)絡維護、不同廠商設備間的互通等多項功能，能**提高網(wǎng)絡資源利用率、降低管理及維護費用、實現(xiàn)靈活可靠和***的網(wǎng)絡運行與維護，因此是當今世界信息領域在傳輸技術方面的發(fā)展和應用的熱點，受到人們的***重視。 </p> <p> <br /> 山西烽火180</p><p 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