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class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="hawyart" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244845101923829/7728521.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="s7gf7gd" 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>海南烽火Citrans 550F,烽火</p><p><span>***更新：</span>2020-07-13 05:23:40</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="xl8lnzq" 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="ih2m8e3" class="page-proshow02"><p class="title">詳細說明</p><div id="sl2byf2" class="box"><p><p> SDH網(wǎng)絡(luò)的常見網(wǎng)元和功能 </p> <p> ADM——分/插復(fù)用器 </p> <p> 分/插復(fù)用器用于SDH傳輸網(wǎng)絡(luò)的轉(zhuǎn)接站點處，例如鏈的中間結(jié)點或環(huán)上結(jié)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(cè)的光纜（每側(cè)收/發(fā)共兩根光纖），海南烽火Citrans 550F，為了描述方便我們將其分為西（W）向、東向（E）兩個線路端口，海南烽火Citrans 550F。ADM的作用是將低速支路信號交叉復(fù)用進東或西向線路上去，海南烽火Citrans 550F，或從東或西側(cè)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(cè)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。星形網(wǎng)絡(luò)拓撲是將網(wǎng)中一網(wǎng)元做為中心節(jié)點設(shè)備與其他各網(wǎng)元節(jié)點相連。海南烽火Citrans 550F</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="海南烽火Citrans 550F,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845101923829/7728521.jpg"></div><p> SDH的特點 </p> <p> SDH是數(shù)字傳輸體制上繼PDH之后的一次劃時代的飛躍。SDH之所以能夠快速發(fā)展這是與它自身的特點是分不開的，其具體特點如下： </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)字傳輸標準速率和標準的光路接口，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)字傳輸體制標準，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)凈負荷區(qū)內(nèi)的排列非常有規(guī)律，而凈負荷與網(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，實現(xiàn)了一次復(fù)用的特性，克服了PDH準同步復(fù)用方式對全部高速信號進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大，具有較強的生存率。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)的維管費和生存能力起到了積極作用；新疆SDH光端機烽火RET各種PDH支路信號復(fù)用進STM-N幀的過程都要經(jīng)歷映射、定位、復(fù)用三個步驟。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="海南烽火Citrans 550F,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845105000000/3722756.jpg"></div><p> 二纖雙向復(fù)用段保護環(huán)將每根光纖的前一半時隙傳送主用業(yè)務(wù)，后一半時隙傳送額外業(yè)務(wù)，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(wù)。業(yè)務(wù)容量為四纖雙向復(fù)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(wù)分散的網(wǎng)絡(luò)。 </p> <p> 二纖單向通道保護環(huán)和二纖雙向復(fù)用段保護環(huán)的比較 </p> <p> 業(yè)務(wù)容量（*考慮主用業(yè)務(wù)） </p> <p> 單向通道保護環(huán)的比較大業(yè)務(wù)容量是STM-N，二纖雙向復(fù)用段保護環(huán)的業(yè)務(wù)容量為M/2 ×STM-N（M是環(huán)上節(jié)點數(shù)）。 </p> <p> 復(fù)雜性 </p> <p> 二纖單向通道保護環(huán)，無論從實現(xiàn)控制的復(fù)雜性，還是設(shè)備的開發(fā)和制作難度來說，都是各種倒換環(huán)中**簡單的。由于它不涉及APS的協(xié)議處理過程，因而業(yè)務(wù)倒換時間也**短。二纖雙向復(fù)用段保護環(huán)的控制邏輯和設(shè)備開發(fā)制作則是各種倒換環(huán)中**復(fù)雜的。 </p> <p> 兼容性 </p><p> SDH的應(yīng)用 </p> <p> 由于以上所述的SDH的眾多特性，使其在廣域網(wǎng)領(lǐng)域和**網(wǎng)領(lǐng)域得到了巨大的發(fā)展。中國移動、電信、聯(lián)通、廣電等電信運營商都已經(jīng)大規(guī)模建設(shè)了基于SDH的骨干光傳輸網(wǎng)絡(luò)。利用大容量的SDH環(huán)路承載IP業(yè)務(wù)、ATM業(yè)務(wù)或直接以租用電路的方式出租給企、事業(yè)單位。而一些大型的**網(wǎng)絡(luò)也采用了SDH技術(shù)，架設(shè)系統(tǒng)內(nèi)部的SDH光環(huán)路，以承載各種業(yè)務(wù)。比如電力系統(tǒng)，就利用SDH環(huán)路承載內(nèi)部的數(shù)據(jù)、遠控、視頻、語音等業(yè)務(wù)。 </p> <p> 而對于組網(wǎng)更加迫切、而又沒有可能架設(shè)**SDH環(huán)路的單位，很多都采用了租用電信運營商電路的方式。由于SDH基于物理層的特點，單位可在租用電路上承載各種業(yè)務(wù)而不受傳輸?shù)南拗?。承載方式有很多種，可以是利用基于TDM技術(shù)的綜合復(fù)用設(shè)備實現(xiàn)多業(yè)務(wù)的復(fù)用，也可以利用基于IP的設(shè)備實現(xiàn)多業(yè)務(wù)的分組交換。SDH技術(shù)可真正實現(xiàn)租用電路的帶寬保證，安全性方面也優(yōu)于VPN等方式。在****和對安全性非常注重的企業(yè)，SDH租用線路得到了***的應(yīng)用。一般來說，SDH可提供E1、E3、STM-1或STM-4等接口，完全可以滿足各種帶寬要求。同時在價格方面，也已經(jīng)為大部分單位所接受。為了保證電網(wǎng)安全、經(jīng)濟地運行, 必須配置調(diào)度、保護、遠程控制等系統(tǒng)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="海南烽火Citrans 550F,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845105136719/8556415.jpg"></div><p> <p> 傳輸網(wǎng)上的業(yè)務(wù)按流向可分為單向業(yè)務(wù)和雙向業(yè)務(wù)。以環(huán)網(wǎng)為例說明單向業(yè)務(wù)和雙向業(yè)務(wù)的區(qū)別。 </p> <p> <br /> </p> <p> 若A和C之間互通業(yè)務(wù)，A到C的業(yè)務(wù)路由假定是A→B→C，若此時C到A的業(yè)務(wù)路由是C→B→A，則業(yè)務(wù)從A到C和從C到A的路由相同，稱為一致路由。 </p> <p> 若此時C到A的路由是C→D→A，那么業(yè)務(wù)從A到C和業(yè)務(wù)從C到A的路由不同，稱為分離路由。 </p> <p> 我們稱一致路由的業(yè)務(wù)為雙向業(yè)務(wù)，分離路由的業(yè)務(wù)為單向業(yè)務(wù)。常見組網(wǎng)的業(yè)務(wù)方向和路由。 </p> <p> 深圳市騰云科創(chuàng)信息咨詢有限公司以質(zhì)量的服務(wù)、良好的信譽、雄厚的技術(shù)力量為廣大客戶提供質(zhì)量服務(wù)。我司供應(yīng)中興ZXMP系列產(chǎn)品：ZXMP S200｜ZXMP S320｜ZXMP S330｜ZXMP S325｜ZXMP S385｜ZXMP S390整機及各型號單板。供應(yīng)華為Metro系列產(chǎn)品：Metro1000｜Metro2050｜Metro3000｜Optix2500+｜Metro5000整機及各型號單板。供應(yīng)華為OSN系列產(chǎn)品：OSN1500B｜OSN2000｜OSN2500｜OSN3500｜OSN7500整機及各型號單板。供應(yīng)烽火IBAS系列產(chǎn)品： IBAS780A｜IBAS780B供應(yīng)PCM綜合接入設(shè)備：FA16接入設(shè)備｜BX10接入設(shè)備。努力奉獻，您的滿意是我們一直的追求！ </p> </p> <p> <br /> 由于SDH有多種網(wǎng)絡(luò)拓撲結(jié)構(gòu)，它所組成的網(wǎng)絡(luò)非常靈活。海南烽火Citrans 550F</p><p style="text-indent:25px">由此可見, 通信在電力系統(tǒng)中的作用是非常關(guān)鍵的。海南烽火Citrans 550F</p><p> 保護倒換系統(tǒng) </p> <p> 目前環(huán)形網(wǎng)絡(luò)的拓撲結(jié)構(gòu)用得**多，因為環(huán)形網(wǎng)具有較強的自愈功能。自愈環(huán)的分類可按保護的業(yè)務(wù)級別、環(huán)上業(yè)務(wù)的方向、網(wǎng)元節(jié)點間光纖數(shù)來劃分。按環(huán)上業(yè)務(wù)的方向可將自愈環(huán)分為單向環(huán)和雙向環(huán)兩大類；按網(wǎng)元節(jié)點間的光纖數(shù)可將自愈環(huán)劃分為雙纖環(huán)(一對收／發(fā)光纖)和四纖環(huán)(兩對收發(fā)光纖)；按保護的業(yè)務(wù)級別可將自愈環(huán)劃分為通道保護環(huán)和復(fù)用段保護環(huán)兩大類。 </p> <p> <br /> </p> <p> SDH通信網(wǎng)具有保護機制實現(xiàn)網(wǎng)絡(luò)的自愈，在發(fā)生短暫失效時會自動切換到保護通道，而不需要人工切換。然而，由于人為因素或設(shè)備故障，一旦發(fā)生業(yè)務(wù)中斷，尤其是傳輸繼電保護信號的網(wǎng)絡(luò)發(fā)生故障，造成的巨大損失無法估計。SDH設(shè)備的保護方式應(yīng)符合ITU.T建議G．841規(guī)范及將來的G.SHR建議要求。 </p> <p> <br /> </p> <p> 例如某地**環(huán)采用二纖雙向復(fù)用段保護方式，當線路出現(xiàn)故障時可通過傳輸系統(tǒng)的保護倒換機制，使業(yè)務(wù)迅速恢復(fù)(保護倒換時間在50rIls以內(nèi))。在二纖雙向復(fù)用段保護環(huán)上無專門的主、備用光纖，每一條光纖的前半個時隙是主用信道，后半個時隙是備信道，兩根光纖上業(yè)務(wù)流向相反。 </p> <p> <br /> 海南烽火Citrans 550F</p><p style="text-indent:25px">深圳市騰云科創(chuàng)信息咨詢有限公司一直專注于電力設(shè)備、電子元器件、電子產(chǎn)品、建筑材料、通信設(shè)備(中興通訊及華為技術(shù)各系列產(chǎn)品板件及整套設(shè)備的銷售與安裝，設(shè)備維護及板件返修，以及各設(shè)備可配置的單板，用戶電纜，中繼電纜等)、辦公設(shè)備、五金交電、化工原料（不含危險及監(jiān)控化學品）的銷售；經(jīng)濟信息咨詢；經(jīng)營進出口業(yè)務(wù)。，是一家通信產(chǎn)品的企業(yè)，擁有自己**的技術(shù)體系。公司目前擁有高技術(shù)人才5人以下人，以不斷增強企業(yè)核心競爭力，加快企業(yè)技術(shù)創(chuàng)新，實現(xiàn)穩(wěn)健生產(chǎn)經(jīng)營。深圳市騰云科創(chuàng)信息咨詢有限公司主營業(yè)務(wù)涵蓋[ "SDH光傳輸設(shè)備", "光端機", "PCM接入設(shè)備", "PTN OTN光傳輸設(shè)備" ]，堅持“質(zhì)量***、質(zhì)量服務(wù)、顧客滿意”的質(zhì)量方針，贏得廣大客戶的支持和信賴。公司力求給客戶提供***質(zhì)量服務(wù)，我們相信誠實正直、開拓進取地為公司發(fā)展做正確的事情，將為公司和個人帶來共同的利益和進步。經(jīng)過幾年的發(fā)展，已成為[ "SDH光傳輸設(shè)備", "光端機", "PCM接入設(shè)備", "PTN OTN光傳輸設(shè)備" ]行業(yè)**企業(yè)。</p></p><br /><p>文章來源地址: http://m.cdcfah.com/cp/581139.html</p></div></div></div></div></div><div id="cgf78ew" class="page-right twoColRt"><div id="u87se8j" class="box01 margin10 clearfix"><h3><a href="http://m.cdcfah.com/cp/">猜你喜歡</a></h3><div id="3r339t7" class="recomPic 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