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src="https://tyunfile.71360.com/UploadFile/sztykc/637244845103378907/6385040.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="23lxzgs" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244845103378907/6385040.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="nmjg7wy" 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>松江區(qū)烽火780A,烽火</p><p><span>***更新：</span>2020-08-26 15:20:43</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="7xegyfr" 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="jy74spr" class="page-proshow02"><p class="title">詳細說明</p><div id="ynpme3x" class="box"><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)一網管系統(tǒng)操作的綜合信息傳送網絡，是美國貝爾通信技術研究所提出來的同步光網絡（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，松江區(qū)烽火780A。它可實現(xiàn)網絡有效管理、實時業(yè)務監(jiān)控、動態(tài)網絡維護，松江區(qū)烽火780A、不同廠商設備間的互通等多項功能，能**提高網絡資源利用率、降低管理及維護費用、實現(xiàn)靈活可靠和***的網絡運行與維護，松江區(qū)烽火780A，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 /> SDH網是由SDH網元設備通過光纜互連而成的。松江區(qū)烽火780A</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="松江區(qū)烽火780A,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845103378907/6385040.jpg"></div><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。廣州烽火180主要進行光功率放大以延長光傳輸距離；</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="松江區(qū)烽火780A,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845101689454/9165528.jpg"></div><p> SDH網絡的常見網元和功能 </p> <p> SDH傳輸網是由不同類型的網元通過光纜線路的連接組成的，通過不同的網元完成SDH網的傳送功能：上/下業(yè)務、交叉連接業(yè)務、網絡故障自愈等。下面我們講述SDH網中常見網元的特點和基本功能。 </p> <p> TM——終端復用器 </p> <p> 終端復用器用在網絡的終端站點上，例如一條鏈的兩個端點上，它是一個雙端口器件。它的作用是將支路端口的低速信號復用到線路端口的高速信號STM-N中，或從STM-N的信號中分出低速支路信號。請注意它的線路端口輸入/輸出一路STM-N信號，而支路端口卻可以輸出/輸入多路低速支路信號。在將低速支路信號復用進STM-N幀（將低速信號復用到線路）上時，有一個交叉的功能，例如：可將支路的一個STM-1信號復用進線路上的STM-16信號中的任意位置上，也就是指復用在1~16個STM-1的任一個位置上。將支路的2Mbit/s信號可復用到一個STM-1中63個VC12的任一個位置上去。對于華為設備，TM的線路端口（光口）一般以西向端口默認表示的。 </p><p> 免除了**困難的光纜輔設工程，比較適用于具有大規(guī)模用戶的企業(yè)。又如委托公眾網**為本企業(yè)或部門使用的虛擬**網，它所提供的功能和容量完全按照用戶的要求進行，這就免除了全部的投資風險和維護工作，應用機動靈活，使用部門可以專心致力于其本行業(yè)的業(yè)務工作。 </p> <p> 廣而言之，把企業(yè)非**的服務性職能交給社會的專業(yè)部門經營，而集中力量從事自己的**業(yè)務，甚至**所謂的虛擬公司，這已經成為上世紀90年代以來西方國家的企業(yè)為提高其競爭力而公認的世界性潮流?？傊?，依托穩(wěn)定的服務主體，有條件積極取得進入電信市場競爭的合法地位，或與公網聯(lián)合，間接進軍電信市場，是目前形勢下各大專網的主要選擇；這也是電信技術**的必然產物，更是我國由計劃經濟向市場經濟轉變的要求。 </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。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="松江區(qū)烽火780A,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244847603603516/458709.jpg"></div><p> SDH的特點 </p> <p> 1）SDH傳輸系統(tǒng)在國際上有統(tǒng)一的幀結構數(shù)字傳輸標準速率和標準的光路接口，使網管系統(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)務信號，形成了全球統(tǒng)一的數(shù)字傳輸體制標準，提高了網絡的可靠性； </p> <p> （2）SDH接入系統(tǒng)的不同等級的碼流在幀結構凈負荷區(qū)內的排列非常有規(guī)律，而凈負荷與網絡是同步的，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)了一次復用的特性，克服了PDH準同步復用方式對全部高速信號進行逐級分解然后再生復用的過程，由于**簡化了DXC，減少了背靠背的接口復用設備，改善了網絡的業(yè)務傳送透明性； </p> <p> （3）由于采用了較先進的分插復用器（ADM）、數(shù)字交叉連接（DXC）、網絡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幀結構中安排了信號的5％開銷比特，它的網管功能顯得特別強大，并能統(tǒng)一形成網絡管理系統(tǒng)，為網絡的自動化、智能化、信道的利用率以及降低網絡的維管費和生存能力起到了積極作用；標準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)網成本。松江區(qū)烽火780A</p><p style="text-indent:25px">深圳市騰云科創(chuàng)信息咨詢有限公司，成立于2015年專業(yè)從事通信產品購銷以及施工。松江區(qū)烽火780A</p><p style="text-indent:25px">通信產品產業(yè)鏈持續(xù)分裂和結構演變，設備提供商始終是移動通信發(fā)展的基石。回看過去我國移動通信業(yè)的發(fā)展，行業(yè)發(fā)生了天翻地覆的變化。專網通信產品是各**門實現(xiàn)有效指揮調度的必備裝備，一般要求大型組網和高性能產品，因此SDH光傳輸設備，光端機，PCM接入設備，PTN OTN光傳輸設備是專業(yè)無線通信行業(yè)比較大的細分市場。貿易型商家為有效應對市場競爭并提升未來的競爭力，對網絡維護投入將不斷增加，以支撐持續(xù)穩(wěn)定增長的業(yè)務需求。通信業(yè)市場需求和投資規(guī)模的增長，將為通信技術服務行業(yè)開拓廣闊的市場空間?；A電信運營商為有效應對市場競爭并提升未來的競爭力，對貿易投入將不斷增加，以支撐持續(xù)穩(wěn)定增長的業(yè)務需求。通信業(yè)市場需求和投資規(guī)模的增長，將為通信技術服務行業(yè)開拓廣闊的市場空間。松江區(qū)烽火780A</p><p style="text-indent:25px">深圳市騰云科創(chuàng)信息咨詢有限公司創(chuàng)建于2015-10-29，注冊資金 100-200萬元，辦公設施齊全，辦公環(huán)境優(yōu)越，已全力實行網絡化辦公，**提高了速度和效率。中興,華為,烽火是深圳市騰云科創(chuàng)信息咨詢有限公司的主營品牌，是專業(yè)的電力設備、電子元器件、電子產品、建筑材料、通信設備(中興通訊及華為技術各系列產品板件及整套設備的銷售與安裝，設備維護及板件返修，以及各設備可配置的單板，用戶電纜，中繼電纜等)、辦公設備、五金交電、化工原料（不含危險及監(jiān)控化學品）的銷售；經濟信息咨詢；經營進出口業(yè)務。公司，擁有自己**的技術體系。公司不**提供專業(yè)的電力設備、電子元器件、電子產品、建筑材料、通信設備(中興通訊及華為技術各系列產品板件及整套設備的銷售與安裝，設備維護及板件返修，以及各設備可配置的單板，用戶電纜，中繼電纜等)、辦公設備、五金交電、化工原料（不含危險及監(jiān)控化學品）的銷售；經濟信息咨詢；經營進出口業(yè)務。,同時還建立了完善的售后服務體系,為客戶提供質量的產品和服務。自公司成立以來，一直秉承“以質量求生存，以信譽求發(fā)展”的經營理念，始終堅持以客戶的需求和滿意為重點，為客戶提供質量的SDH光傳輸設備，光端機，PCM接入設備，PTN OTN光傳輸設備，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/1048606.html</p></div></div></div></div></div><div id="fuw2rjb" class="page-right twoColRt"><div id="zjgda3i" class="box01 margin10 clearfix"><h3><a href="http://m.cdcfah.com/cp/">猜你喜歡</a></h3><div id="8czgd78" class="recomPic likePro"><a href="http://m.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" 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