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id="zj87eoa" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244847797656250/1749392.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="icjq37k" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244847797656250/1749392.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="onkc3fm" 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>新疆光端機烽火,烽火</p><p><span>***更新：</span>2020-07-29 04:19:57</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="utqi7ol" 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(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="j3nw27e" class="page-proshow02"><p class="title">詳細說明</p><div id="3gsfune" class="box"><p><p> 隨著骨干傳輸容量不斷增大，城域傳輸網(wǎng)絡(luò)的接入能力也多樣化。但以IP為主的網(wǎng)絡(luò)業(yè)務(wù)仍然是不可預(yù)知的，這需要傳輸網(wǎng)絡(luò)具有更好的自適應(yīng)能力，而這種自適應(yīng)能力不**是網(wǎng)絡(luò)接口或網(wǎng)絡(luò)容量的適應(yīng)能力，而且要求網(wǎng)絡(luò)連接的自適應(yīng)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(wù)接入和業(yè)務(wù)收斂是對未來城域網(wǎng)接入系統(tǒng)的主要需求。 </p> <p> 簡單地講，這種采用SDH傳輸以太網(wǎng)等多種業(yè)務(wù)的方式就是將不同的網(wǎng)絡(luò)層次的業(yè)務(wù)通過ＶＣ級聯(lián)的方式映射到SDH電路的各個時隙中，由SDH網(wǎng)絡(luò)提供完全透明的傳輸通道，從物理層的設(shè)備角度上看是一個集成的整體。這種解決方案可以大幅度地降低投資規(guī)模，減少設(shè)備占地面積，降低功耗，進而降低網(wǎng)絡(luò)運營商的運營成本。同時，新疆光端機烽火，新疆光端機烽火，提供多業(yè)務(wù)的能力還可以使網(wǎng)絡(luò)運營商能夠快速地部署網(wǎng)絡(luò)業(yè)務(wù)，提高業(yè)務(wù)收入，增強市場競爭能力。 </p> <p> <br /> 電力系統(tǒng)一旦發(fā)生故障, 如果通信不暢，新疆光端機烽火, 不能及時調(diào)度指揮,就會擴大***范圍。新疆光端機烽火</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="新疆光端機烽火,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244847797656250/1749392.jpg"></div><p> SDH的產(chǎn)生背景 </p> <p> SDH技術(shù)的誕生有其必然性，隨著通信的發(fā)展，要求傳送的信息不*是話音，還有文字、數(shù)據(jù)、圖像，和視頻等。加之?dāng)?shù)字通信和計算機技術(shù)的發(fā)展，在70至80年代，陸續(xù)出現(xiàn)了T1(DS1)／E1載波系統(tǒng)(1.544／2.048Mbps)、X.25幀中繼、ISDN(綜合業(yè)務(wù)數(shù)字網(wǎng)) 和FDDI(光纖分布式數(shù)據(jù)接口)等多種網(wǎng)絡(luò)技術(shù)。隨著信息社會的到來，人們希望現(xiàn)代信息傳輸網(wǎng)絡(luò)能快速、經(jīng)濟、有效地提供各種電路和業(yè)務(wù)，而上述網(wǎng)絡(luò)技術(shù)由于其業(yè)務(wù)的單調(diào)性，擴展的復(fù)雜性，帶寬的局限性，*在原有框架內(nèi)修改或完善已無濟于事。SDH就是在這種背景下發(fā)展起來的。新疆光端機烽火電力網(wǎng)的發(fā)展對電力系統(tǒng)**通信網(wǎng)提出了更高的要求。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="新疆光端機烽火,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845102001954/2472236.jpg"></div><p> 樹形網(wǎng) </p> <p> <br /> </p> <p> 樹形網(wǎng)絡(luò)拓撲可看成是鏈形拓撲和星形拓撲的結(jié)合。 </p> <p> <br /> </p> <p> 環(huán)形網(wǎng) </p> <p> <br /> </p> <p> 環(huán)形網(wǎng)拓撲實際上是指將鏈形拓撲首尾相連，從而使網(wǎng)上任何一個網(wǎng)元節(jié)點都不對外開放的網(wǎng)絡(luò)拓撲形式。這是當(dāng)前使用**多的網(wǎng)絡(luò)拓撲形式，主要是因為它具有很強的生存性，即自愈功能較強。 </p> <p> <br /> </p> <p> 網(wǎng)孔形網(wǎng) </p> <p> <br /> </p> <p> 將所有網(wǎng)元節(jié)點兩兩相連，就形成了網(wǎng)孔形網(wǎng)絡(luò)。這種網(wǎng)絡(luò)拓撲為兩網(wǎng)元節(jié)點間提供多個傳輸路由，使網(wǎng)絡(luò)的可靠更強。但是由于系統(tǒng)的冗余度高，必會使系統(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)拓撲是鏈形和環(huán)形，通過它們的靈活組合，可構(gòu)成更加復(fù)雜的網(wǎng)絡(luò)。 </p><p> SDH的缺點， </p> <p> 1，頻帶利用率低。 </p> <p> 可靠性和有效性是矛盾的，增加了有效性必將降低可靠性，增加了可靠性也會相應(yīng)的使有效性降低。例如，收音機的選擇性增加，可選的電臺就增多，這樣就提高了選擇性。但是，由于這時頻帶相應(yīng)的會變窄，必然會使音質(zhì)下降，也就降低了可靠性。 </p> <p> 2，指針調(diào)整機理復(fù)雜。 </p> <p> SDH體制可以從高速信號（STM-1）中直接下低速信號（例如2Mbit/s），省去了多級復(fù)用，解復(fù)用過程，這種功能的實現(xiàn)是通過指針機理來完成的。但是，指針功能的實現(xiàn)增加了系統(tǒng)的復(fù)雜性。**重要的是系統(tǒng)產(chǎn)生SDH的一種特有抖動—由指針調(diào)整引起的結(jié)合抖動。 </p> <p> 3，軟件的大量使用對系統(tǒng)的安全性的影響。 </p> <p> 在***無處不在的***，軟件的的大量使用，很容易受到***的破壞，加上人為操作，軟件故障，對系統(tǒng)的影響也是致命的。 </p> <p> <br /> 段，相當(dāng)于一條大的傳輸通道。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="新疆光端機烽火,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845103378907/6385040.jpg"></div><p> STM-N的幀結(jié)構(gòu)由3部分組成： </p> <p> 1、信息凈負荷（payload）。 </p> <p> 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(jié)構(gòu)中存放將由STM-N傳送的各種用戶信息碼塊的地方。 </p> <p> 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(zé)對打包的貨物（低速信號）進行通道性能監(jiān)視、管理和控制。 </p> <p> 2、段開銷（SOH） </p> <p> 段，相當(dāng)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(luò)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(dāng)然，SOH和POH還有一些其他管理功能。 </p> <p> 段開銷又分為再生段開銷（RSOH）和復(fù)用段開銷（MSOH），可分別對相應(yīng)的段層進行監(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(zhǔn)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(zhǔn)確分離信息凈負荷。 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。新疆光端機烽火</p><p style="text-indent:25px">隨著網(wǎng)絡(luò)傳輸技術(shù)的不斷發(fā)展, 電力系統(tǒng)中基于寬帶數(shù)據(jù)網(wǎng)的應(yīng)用也越來越多。新疆光端機烽火</p><p> <br /> </p> <p> SDH的特點 </p> <p> （1）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，它能增強網(wǎng)監(jiān)，運行管理和自動配置功能，優(yōu)化了網(wǎng)絡(luò)性能，同時也使網(wǎng)絡(luò)運行靈活、安全、可靠，使網(wǎng)絡(luò)的功能非常齊全和多樣化； </p> <p> （2）SDH有傳輸和交換的性能，它的系列設(shè)備的構(gòu)成能通過功能塊的自由組合，實現(xiàn)了不同層次和各種拓撲結(jié)構(gòu)的網(wǎng)絡(luò)，十分靈活； </p> <p> （3）SDH并不專屬于某種傳輸介質(zhì)，它可用于雙絞線、同軸電纜，但SDH用于傳輸高數(shù)據(jù)率則需用光纖。這一特點表明，SDH既適合用作干線通道，也可作支線通道。例如，我國的國家與省級有線電視干線網(wǎng)就是采用SDH，而且它也便于與光纖電纜混合網(wǎng)(HFC)相兼容。 </p> <p> （4）從OSI模型的觀點來看，SDH屬于其比較低層的物理層，并未對其高層有嚴(yán)格的限制，便于在SDH上采用各種網(wǎng)絡(luò)技術(shù)，支持ATM或IP傳輸； </p> <p> （5）SDH是嚴(yán)格同步的，從而保證了整個網(wǎng)絡(luò)穩(wěn)定可靠，誤碼少，且便于復(fù)用和調(diào)整； </p> <p> （6）標(biāo)準(zhǔn)的開放型光接口可以在基本光纜段上實現(xiàn)橫向兼容，降低了聯(lián)網(wǎng)成本。 </p> <p> <br /> </p> <p> <br /> 新疆光端機烽火</p><p style="text-indent:25px">深圳市騰云科創(chuàng)信息咨詢有限公司于2015-10-29成立，注冊資本100-200萬元元，現(xiàn)有專業(yè)技術(shù)人員5人以下人，各種專業(yè)人員齊備。專業(yè)的團隊大多數(shù)員工都有多年工作經(jīng)驗，熟悉行業(yè)專業(yè)知識技能，致力于發(fā)展中興,華為,烽火的品牌。公司以用心服務(wù)為**價值,希望通過我們的專業(yè)水平和不懈努力,將電力設(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(xué)品）的銷售；經(jīng)濟信息咨詢；經(jīng)營進出口業(yè)務(wù)。等業(yè)務(wù)進行到底。自公司成立以來，一直秉承“以質(zhì)量求生存，以信譽求發(fā)展”的經(jīng)營理念，始終堅持以客戶的需求和滿意為**，為客戶提供質(zhì)量的[ "SDH光傳輸設(shè)備", "光端機", "PCM接入設(shè)備", "PTN OTN光傳輸設(shè)備" ]，從而使公司不斷發(fā)展壯大。</p></p><br /><p>文章來源地址: http://m.cdcfah.com/cp/736202.html</p></div></div></div></div></div><div id="8zbdkmy" class="page-right twoColRt"><div id="xzv3woq" class="box01 margin10 clearfix"><h3><a href="http://m.cdcfah.com/cp/">猜你喜歡</a></h3><div id="3yacugd" class="recomPic likePro"><a href="http://m.cdcfah.com/cp/814588.html"><div><img 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