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src="https://tyunfile.71360.com/UploadFile/sztykc/637244847651777344/7289118.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="ynkeg2n" 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>四川銷售光傳輸設備烽火CONT,烽火</p><p><span>***更新：</span>2021-01-31 08:07:57</p><p><span id="click" >瀏覽次數(shù)：4次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="qfcmdf3" 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="jxumjvs" class="page-proshow02"><p class="title">詳細說明</p><div id="vkr77mt" class="box"><p><p> <span style="font-size:16px;font-family:"Microsoft YaHei";">STM-N的幀結構由3部分組成：</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">1、信息凈負荷（payload）。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">信息凈負荷位于STM-N幀中第1到第9行，第9×N+1到第270×N列，共9×261×N個字節(jié)。信息凈負荷是在STM-N幀結構中存放將由STM-N傳送的各種用戶信息碼塊的地方。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">為了實時監(jiān)測貨物（打包的低速信號）在傳輸過程中是否有損壞，在將低速信號打包的過程中加入了通道開銷（POH）字節(jié)。POH作為凈負荷的一部分與信息碼塊一起裝載在STM-N這輛貨車上在SDH網(wǎng)中傳送，它負責對打包的貨物（低速信號）進行通道性能監(jiān)視、管理和控制。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">2、段開銷（SOH）</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">段，四川銷售光傳輸設備烽火CONT，相當于一條大的傳輸通道，段開銷是為了保證信息凈負荷正常傳送所必須附加的網(wǎng)絡運行、管理和維護（OAM）字節(jié)。也就是說SOH完成對貨物整體的監(jiān)控，POH是完成對某一件特定的貨物進行監(jiān)控，當然，SOH和POH還有一些其他管理功能。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">段開銷又分為再生段開銷（RSOH）和復用段開銷（MSOH），可分別對相應的段層進行監(jiān)控，二者的區(qū)別在于監(jiān)管的范圍不同。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">3，四川銷售光傳輸設備烽火CONT，四川銷售光傳輸設備烽火CONT、管理單元指針（AU-PTR）</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">管理單元指針位于STM-N幀中第4行的***到第9×N列，共9×N個字節(jié)。AU-PTR是用來指示信息凈負荷的個字節(jié)在STM-N幀內(nèi)的準確位置的指示符，以便接收端能根據(jù)這個位置指示符的值（指針值）準確分離信息凈負荷。</span> 信息凈負荷位于STM-N幀中第1到第9行。四川銷售光傳輸設備烽火CONT</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="四川銷售光傳輸設備烽火CONT,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244847651777344/7289118.jpg"></div><p> <span style="font-size:16px;font-family:"Microsoft YaHei";"> 電源系統(tǒng)SDH設備采用一48伏直流電源，工作電壓應滿足：輸入電壓范圍是-40V至-57V；電話衡量雜音電壓<2mV；峰峰值雜音電壓(0．300Hz)_<400mV。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";"> 根據(jù)公式：電流=功率／電壓。各設備正常工作時的比較大電流等于滿配置功耗除以工作電壓。比較大電流再加上適當富余量取整可得所需熔絲大小。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";"> 時鐘同步系統(tǒng)</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">SDH網(wǎng)元時鐘源的種類</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">(1)外部時鐘源——由SETPI功能塊提供輸入接口；</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">(2)線路時鐘源一由SPI功能塊從STM．N線路信號中提??；</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">(3)支路時鐘源——由PPI功能塊從PDH支路信號中提取，不過該時鐘一般不用，因為SDH／PDH網(wǎng)邊界處的指針調(diào)整會影響時鐘質(zhì)量；</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">(4)設備內(nèi)置時鐘源由SETS功能塊提供。</span> </p> <p> <br /> </p> <p> <br /> 寧夏光傳輸設備SDH烽火STM-64為了實時監(jiān)測貨物（打包的低速信號）在傳輸過程中是否有損壞。</p> <span style="font-size:16px;font-family:"Microsoft YaHei";"></span><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="四川銷售光傳輸設備烽火CONT,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244847603603516/458709.jpg"></div><p> <span style="font-size:16px;font-family:"Microsoft YaHei";"> 基本的網(wǎng)絡拓撲結構</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";"> SDH網(wǎng)是由SDH網(wǎng)元設備通過光纜互連而成的，網(wǎng)絡節(jié)點設備（網(wǎng)元）和傳輸線路的幾何排列就構成了網(wǎng)絡的拓撲結構。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。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";"> 網(wǎng)絡拓撲的基本結構有鏈形、星形、樹形、環(huán)形和網(wǎng)孔形。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";"> 鏈形網(wǎng)：</span><span style="font-family:"Microsoft YaHei";font-size:16px;">鏈形網(wǎng)絡拓撲是將網(wǎng)中的所有節(jié)點一一串聯(lián)，而首尾兩端開放。這種拓撲的特點是較經(jīng)濟，在SDH網(wǎng)的早期用得較多，主要用于專網(wǎng)如鐵路網(wǎng)中。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";"> 星形網(wǎng)：</span><span style="font-family:"Microsoft YaHei";font-size:16px;">星形網(wǎng)絡拓撲是將網(wǎng)中一網(wǎng)元做為中心節(jié)點設備與其他各網(wǎng)元節(jié)點相連，其他各網(wǎng)元節(jié)點之間互不相連，網(wǎng)元節(jié)點的業(yè)務都要經(jīng)過這個特殊節(jié)點轉(zhuǎn)接。</span> </p> <p> <br /> </p> <p> <br /> </p> <p> <br /> </p> <p> <br /> </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，使其成為不但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 /> </p> <p> <br /> 光傳輸網(wǎng)的再生中繼器有兩種，一種是純光的再生中繼器。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="四川銷售光傳輸設備烽火CONT,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845105000000/3722756.jpg"></div><p> <span style="font-size:16px;font-family:"Microsoft YaHei";">SDH的復用包括兩種情況：</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">1、由STM-1信號復用成STM-N信號</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">復用的方法主要通過字節(jié)間插的同步復用方式來完成的，復用的基數(shù)是4，即4×STM-1→STM-4，4×STM-4→STM-16。在復用過程中保持幀頻不變（8000幀/秒），這就意味著高一級的STM-N信號是低一級的STM-n信號速率的4倍。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">在進行字節(jié)間插復用過程中，各幀的信息凈負荷和指針字節(jié)按原值進行字節(jié)間插復用，而STM-N的段開銷并不是由所有低階STM-N幀中的段開銷間插復用而成，而是舍棄了某些低階幀中的段開銷。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">2、由PDH支路信號復用成STM-N信號</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">各種PDH支路信號復用進STM-N幀的過程都要經(jīng)歷映射、定位、復用三個步驟。映射相當于信號打包，定位伴隨與指針調(diào)整，復用相當于字節(jié)間插復用。ITU-T規(guī)定了一整套完整的映射復用結構，也就是映射復用路線，通過這些路線可將PDH的3個系列的數(shù)字信號以多種方法復用成STM-N信號。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">復用結構包括了一些基本的復用單元：C－容器、VC－虛容器、TU－支路單元、TUG－支路單元組、AU－管理單元、AUG－管理單元組，這些復用單元的下標表示與此復用單元相應的信號級別。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">從一個有效負荷到STM-N的復用路線不是的，有多條路線（也就是說有多種復用方法），8Mbit/s的PDH支路信號是無法復用成STM-N信號的。</span> </p> <p> <br /> </p> <p> <br /> 同時也使網(wǎng)絡運行靈活、安全、可靠，使網(wǎng)絡的功能非常齊全和多樣化；貴州全新光傳輸設備烽火STM-4</p><p style="text-indent:25px">將所有網(wǎng)元節(jié)點兩兩相連，就形成了網(wǎng)孔形網(wǎng)絡。四川銷售光傳輸設備烽火CONT</p><p> <span style="font-size:16px;font-family:"Microsoft YaHei";"> SDH的發(fā)展趨勢：</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";"> SDH作為新一代理想的傳輸體系，具有路由自動選擇能力，上下電路方便，維護、控制、管理功能強，標準統(tǒng)一，便于傳輸更高速率的業(yè)務等優(yōu)點，能很好地適應通信網(wǎng)飛速發(fā)展的需要。迄今，SDH得到了空前的應用與發(fā)展。在標準化方面，已建立和即將建立的一系列建議已基本上覆蓋了SDH的方方面面。在干線網(wǎng)和長途網(wǎng)、中繼網(wǎng)、接入網(wǎng)中它開始廣泛應用。且在光纖通信、微波通信、衛(wèi)星通信中也積極地開展研究與應用。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";"></span> 四川銷售光傳輸設備烽火CONT</p><p style="text-indent:25px">深圳市騰云科創(chuàng)信息咨詢有限公司致力于通信產(chǎn)品，是一家貿(mào)易型公司。公司自成立以來，以質(zhì)量為發(fā)展，讓匠心彌散在每個細節(jié)，公司旗下SDH光傳輸設備，光端機，PCM接入設備，PTN OTN光傳輸設備深受客戶的喜愛。公司將不斷增強企業(yè)重點競爭力，努力學習行業(yè)知識，遵守行業(yè)規(guī)范，植根于通信產(chǎn)品行業(yè)的發(fā)展。騰云科創(chuàng)立足于全國市場，依托強大的研發(fā)實力，融合前沿的技術理念，飛快響應客戶的變化需求。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/3093717.html</p></div></div></div></div></div><div id="bq3iubi" class="page-right twoColRt"><div id="pjldkr8" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="xrjg3cu" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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