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id="mqn59wd" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244845103808594/6520524.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="fublpbd" 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>產品關鍵詞：</span>湖南SDH設備烽火STM-4,烽火</p><p><span>***更新：</span>2020-09-14 09:06:11</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="8jla7b8" 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="i2suzgi" class="page-proshow02"><p class="title">詳細說明</p><div id="mrjgyk7" class="box"><p><p> 隨著骨干傳輸容量不斷增大，城域傳輸網絡的接入能力也多樣化。但以IP為主的網絡業(yè)務仍然是不可預知的，這需要傳輸網絡具有更好的自適應能力，而這種自適應能力不**是網絡接口或網絡容量的適應能力，而且要求網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傳輸以太網等多種業(yè)務的方式就是將不同的網絡層次的業(yè)務通過ＶＣ級聯(lián)的方式映射到SDH電路的各個時隙中，由SDH網絡提供完全透明的傳輸通道，從物理層的設備角度上看是一個集成的整體，湖南SDH設備烽火STM-4。這種解決方案可以大幅度地降低投資規(guī)模，減少設備占地面積，降低功耗，進而降低網絡運營商的運營成本。同時，提供多業(yè)務的能力還可以使網絡運營商能夠快速地部署網絡業(yè)務，提高業(yè)務收入，湖南SDH設備烽火STM-4，增強市場競爭能力，湖南SDH設備烽火STM-4。 </p> <p> <br /> 由于SDH有多種網絡拓撲結構，它所組成的網絡非常靈活。湖南SDH設備烽火STM-4</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="湖南SDH設備烽火STM-4,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845103808594/6520524.jpg"></div><p> 在各種寬帶光纖接入網技術中，采用SDH技術的接入網系統(tǒng)是應用**普遍的。SDH的誕生解決了由于入戶媒質的帶寬限制而跟不上骨干網和用戶業(yè)務需求的發(fā)展,而產生了用戶與**網之間的接入"瓶頸"的問題，同時提高了傳輸網上大量帶寬的利用率。SDH技術自從90年代引入以來，至今已經是一種成熟、標準的技術，在骨干網中被***采用，且價格越來越低，在接入網中應用可以將SDH技術在**網中的巨大帶寬優(yōu)勢和技術優(yōu)勢帶入接入網領域，充分利用SDH同步復用、標準化的光接口、強大的網管能力、靈活網絡拓撲能力和高可靠性帶來好處，在接入網的建設發(fā)展中長期受益。 </p> <p> <br /> 重慶光傳輸設備烽火STM-4將所有網元節(jié)點兩兩相連，就形成了網孔形網絡。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="湖南SDH設備烽火STM-4,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845105205079/5635847.jpg"></div><p> 電力通信**網的構建思路 </p> <p> 電力通信網可以在樞紐節(jié)點、大型變電站、行政中心采用標準的STM 21、STM 24 或STM 216 傳輸設備疊加接入模塊的方式; 在中小型變電站、鄉(xiāng)鎮(zhèn)供電所等業(yè)務量較少的節(jié)點采用單獨簡單配置的STM-21網元設備組網或STM-21網元設備疊加接入模塊的方式; 接入模塊解決話音、V. 24/V. 35、2W/4W、E&M 等窄帶業(yè)務接入, 而10Mb/s、100Mb/s等寬帶數(shù)據(jù)接入則在SDH傳輸平臺上提供,這樣能夠充分保證帶寬和服務質量(QoS)。環(huán)網光纜建設綜合考慮通信、計算機網絡及有線電視傳輸?shù)男枰?采用不等芯數(shù)配置, 做到既滿足要求, 又節(jié)省投資?？紤]到全網的性能價格比, 比較好采用系列化較完整的產品, 對不同節(jié)點選用不同配置的網元設備, 并能進行統(tǒng)一網管, 以實現(xiàn)有效的分層管理, 便于故障快速定位, 從而有效減輕維護工作量。隨著網絡規(guī)模的擴大, 應實現(xiàn)多廠家的設備管理, 要求網管支持標準接口, 即網管系統(tǒng)具備開放性。 </p> <p> 通過基于SDH 的MSTP, 可支持全業(yè)務, 局域網互聯(lián)帶寬可按VC212×N (1～ 48) 平滑設置, 可利用SDH 層的網絡自愈功能實現(xiàn)電信級的保護, 統(tǒng)一的網管方便網絡維護。它完善地解決所有業(yè)務信號的接入和傳輸, 且相對于其它的組網方式具有其明顯的優(yōu)勢。 </p><p> STM-N的幀結構由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幀結構中存放將由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。 </p> <p> 2、段開銷（SOH） </p> <p> 段，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。 </p> <p> 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。 </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。網絡的有效性、可靠性和經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="湖南SDH設備烽火STM-4,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845102001954/2472236.jpg"></div><p> SDH網絡的常見網元和功能 </p> <p> ADM——分/插復用器 </p> <p> 分/插復用器用于SDH傳輸網絡的轉接站點處，例如鏈的中間結點或環(huán)上結點，是SDH網上使用**多、**重要的一種網元，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**重要的一種網元，通過它可等效成其它網元，即能完成其它網元的功能，例如：一個ADM可等效成兩個TM。管理單元指針位于STM-N幀中第4行的***到第9×N列。重慶光傳輸設備烽火STM-4</p><p style="text-indent:25px">由此可見, 通信在電力系統(tǒng)中的作用是非常關鍵的。湖南SDH設備烽火STM-4</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 /> 湖南SDH設備烽火STM-4</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品，是一家貿易型的公司。公司業(yè)務分為SDH光傳輸設備，光端機，PCM接入設備，PTN OTN光傳輸設備等，目前不斷進行創(chuàng)新和服務改進，為客戶提供良好的產品和服務。公司從事通信產品多年，有著創(chuàng)新的設計、強大的技術，還有一批**的專業(yè)化的隊伍，確保為客戶提供良好的產品及服務。在社會各界的鼎力支持下，持續(xù)創(chuàng)新，不斷鑄造***服務體驗，為客戶成功提供堅實有力的支持。</p></p><br /><p>文章來源地址: http://m.cdcfah.com/cp/1277161.html</p></div></div></div></div></div><div id="edkhegi" class="page-right twoColRt"><div id="hwtqizg" class="box01 margin10 clearfix"><h3><a 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