廣州烽火CKU 深圳市騰云科創(chuàng)供應(yīng)-b2b網(wǎng)站_b2b電子商務(wù)平臺(tái)【買產(chǎn)品】-上?？谄蚴称酚邢薰?/title><meta name="description" content="SDH網(wǎng)絡(luò)的常見網(wǎng)元和功能SDH傳輸網(wǎng)是由不同類型的網(wǎng)元通過光纜線路的連接組成的，通過不同的網(wǎng)元完成SDH網(wǎng)的傳送功能：上/下業(yè)務(wù)、交叉連接業(yè)務(wù)、網(wǎng)絡(luò)故障自愈等。下面我們講述SDH網(wǎng)中常見網(wǎng)元的特點(diǎn)和基本功能。TM——終端復(fù)用器終端復(fù)用器用"><meta name="keywords" content="廣州烽火CKU,烽火"><link rel="canonical" href="http://m.cdcfah.com/"/><meta name="applicable-device" content="pc"><link rel="shortcut icon" href="/static/new_net_01/images/favicon.ico"><link rel="stylesheet" href="/static/new_net_01/css/slick.css" /><link rel="stylesheet" href="/static/new_net_01/css/addnew.css"><link rel="stylesheet" href="/static/new_net_01/css/sidenav.css"><link rel="stylesheet" href="/static/new_net_01/css/style.css" /><link rel="stylesheet" href="/static/new_net_01/css/tab.css"><link rel="stylesheet" href="/static/new_net_01/css/404.css"> <meta name="baidu-site-verification" content="OBVzrC9aaQ" /> <meta 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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 id="j2f8zmy" 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="ptzmyam" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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>廣州烽火CKU,烽火</p><p><span>***更新：</span>2020-08-28 13:11:19</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="8txof3u" 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(jī): </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(hào)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="ktfr3oa" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="77uoa8p" class="box"><p><p> SDH網(wǎng)絡(luò)的常見網(wǎng)元和功能 </p> <p> SDH傳輸網(wǎng)是由不同類型的網(wǎng)元通過光纜線路的連接組成的，通過不同的網(wǎng)元完成SDH網(wǎng)的傳送功能：上/下業(yè)務(wù)、交叉連接業(yè)務(wù)、網(wǎng)絡(luò)故障自愈等。下面我們講述SDH網(wǎng)中常見網(wǎng)元的特點(diǎn)和基本功能。 </p> <p> TM——終端復(fù)用器 </p> <p> 終端復(fù)用器用在網(wǎng)絡(luò)的終端站點(diǎn)上，例如一條鏈的兩個(gè)端點(diǎn)上，它是一個(gè)雙端口器件。它的作用是將支路端口的低速信號(hào)復(fù)用到線路端口的高速信號(hào)STM-N中，或從STM-N的信號(hào)中分出低速支路信號(hào)。請注意它的線路端口輸入/輸出一路STM-N信號(hào)，而支路端口卻可以輸出/輸入多路低速支路信號(hào)。在將低速支路信號(hào)復(fù)用進(jìn)STM-N幀（將低速信號(hào)復(fù)用到線路）上時(shí)，有一個(gè)交叉的功能，例如：可將支路的一個(gè)STM-1信號(hào)復(fù)用進(jìn)線路上的STM-16信號(hào)中的任意位置上，也就是指復(fù)用在1~16個(gè)STM-1的任一個(gè)位置上，廣州烽火CKU，廣州烽火CKU。將支路的2Mbit/s信號(hào)可復(fù)用到一個(gè)STM-1中63個(gè)VC12的任一個(gè)位置上去，廣州烽火CKU。對于華為設(shè)備，TM的線路端口（光口）一般以西向端口默認(rèn)表示的。網(wǎng)絡(luò)節(jié)點(diǎn)設(shè)備（網(wǎng)元）和傳輸線路的幾何排列就構(gòu)成了網(wǎng)絡(luò)的拓?fù)浣Y(jié)構(gòu)。廣州烽火CKU</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="廣州烽火CKU,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845101923829/7728521.jpg"></div><p> STM-N信號(hào)幀結(jié)構(gòu)的安排應(yīng)盡可能使支路低速信號(hào)在一幀內(nèi)均勻、有規(guī)律的分布，以便于從高速信號(hào)中直接上/下低速支路信號(hào)。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(jié)構(gòu)。 </p> <p> STM-N的信號(hào)是9行×270×N列的幀結(jié)構(gòu)。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(hào)由N個(gè)STM-1 信號(hào)通過字節(jié)間插復(fù)用而成。由此可知，STM-1信號(hào)的幀結(jié)構(gòu)是9行×270列的塊狀幀。并且，當(dāng)N個(gè)STM-1信號(hào)通過字節(jié)間插復(fù)用成STM-N信號(hào)時(shí)，**是將STM-1信號(hào)的列按字節(jié)間插復(fù)用，行數(shù)恒定為9行不變。 </p> <p> 我們知道，信號(hào)在線路上串行傳輸時(shí)是逐個(gè)比特（bit）地進(jìn)行的，那么這個(gè)塊狀幀是怎樣在線路上進(jìn)行傳輸?shù)哪兀?STM-N信號(hào)的傳輸也遵循按比特的傳輸方式，SDH信號(hào)幀傳輸?shù)脑瓌t是：按幀結(jié)構(gòu)的順序從左到右，從上到下逐個(gè)字節(jié)，并且逐個(gè)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 /> 光傳輸設(shè)備烽火CKUSDH并不專屬于某種傳輸介質(zhì)，它可用于雙絞線、同軸電纜。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="廣州烽火CKU,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845105000000/3722756.jpg"></div><p> SDH的基本傳輸原理 </p> <p> SDH采用的信息結(jié)構(gòu)等級稱為同步傳送模塊STM－N（Synchronous Transport，N=1，4， 16，64），**基本的模塊為STM－1，四個(gè)STM－1同步復(fù)用構(gòu)成STM－4，16個(gè)STM－1或四個(gè) STM－4同步復(fù)用構(gòu)成STM－16；SDH采用塊狀的幀結(jié)構(gòu)來承載信息，每幀由縱向9行和橫向 270×N列字節(jié)組成，每個(gè)字節(jié)含8bit，整個(gè)幀結(jié)構(gòu)分成段開銷（Section OverHead，SOH）區(qū)、STM－N凈負(fù)荷區(qū)和管理單元指針（AU PTR）區(qū)三個(gè)區(qū)域，其中段開銷區(qū)主要用于網(wǎng)絡(luò)的運(yùn)行、管理、維護(hù)及指配以保證信息能夠正常靈活地傳送，它又分為再生段開銷和復(fù)用段開銷； </p><p> <p> <p> 從技術(shù)上來看，接入層的相對帶寬需求較小，需要提供IP、TDM，可能還有ATM等綜合業(yè)務(wù)傳送。以SDH 系統(tǒng)為基礎(chǔ)并能夠提供IP 、ATM 傳送與處理的系統(tǒng)（包括TDM、IP與ATM接口，甚至包括IP 和ATM 交換模塊）將是解決接入層傳送的主要方法，這種方式可廉價(jià)地在一個(gè)業(yè)務(wù)提供點(diǎn)（POP）上提供高質(zhì)量專線、ATM 、IP 等業(yè)務(wù)的接入、傳送和保護(hù)。 </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(yùn)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> <p> <br /> </p> </p> <p> <br /> 網(wǎng)絡(luò)的有效性、可靠性和經(jīng)濟(jì)性在很大程度上與其拓?fù)浣Y(jié)構(gòu)有關(guān)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="廣州烽火CKU,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244847724550782/6753357.jpg"></div><p> 基本的網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu) </p> <p> SDH網(wǎng)是由SDH網(wǎng)元設(shè)備通過光纜互連而成的，網(wǎng)絡(luò)節(jié)點(diǎn)設(shè)備（網(wǎng)元）和傳輸線路的幾何排列就構(gòu)成了網(wǎng)絡(luò)的拓?fù)浣Y(jié)構(gòu)。網(wǎng)絡(luò)的有效性、可靠性和經(jīng)濟(jì)性在很大程度上與其拓?fù)浣Y(jié)構(gòu)有關(guān)。 </p> <p> 網(wǎng)絡(luò)拓?fù)涞幕窘Y(jié)構(gòu)有鏈形、星形、樹形、環(huán)形和網(wǎng)孔形。 </p> <p> 鏈形網(wǎng) </p> <p> 鏈形網(wǎng)絡(luò)拓?fù)涫菍⒕W(wǎng)中的所有節(jié)點(diǎn)一一串聯(lián)，而首尾兩端開放。這種拓?fù)涞奶攸c(diǎn)是較經(jīng)濟(jì)，在SDH網(wǎng)的早期用得較多，主要用于專網(wǎng)如鐵路網(wǎng)中。 </p> <p> 星形網(wǎng) </p> <p> 星形網(wǎng)絡(luò)拓?fù)涫菍⒕W(wǎng)中一網(wǎng)元做為中心節(jié)點(diǎn)設(shè)備與其他各網(wǎng)元節(jié)點(diǎn)相連，其他各網(wǎng)元節(jié)點(diǎn)之間互不相連，網(wǎng)元節(jié)點(diǎn)的業(yè)務(wù)都要經(jīng)過這個(gè)特殊節(jié)點(diǎn)轉(zhuǎn)接。 </p> <p> <br /> </p> <p> <br /> 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。光傳輸設(shè)備烽火CKU</p><p style="text-indent:25px">各種PDH支路信號(hào)復(fù)用進(jìn)STM-N幀的過程都要經(jīng)歷映射、定位、復(fù)用三個(gè)步驟。廣州烽火CKU</p><p> SDH的特點(diǎn) </p> <p> SDH是數(shù)字傳輸體制上繼PDH之后的一次劃時(shí)代的飛躍。SDH之所以能夠快速發(fā)展這是與它自身的特點(diǎn)是分不開的，其具體特點(diǎn)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(biāo)準(zhǔn)速率和標(biāo)準(zhǔn)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(hào)，形成了全球統(tǒng)一的數(shù)字傳輸體制標(biāo)準(zhǔn)，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(fù)荷區(qū)內(nèi)的排列非常有規(guī)律，而凈負(fù)荷與網(wǎng)絡(luò)是同步的，它利用軟件能將高速信號(hào)一次直接分插出低速支路信號(hào)，實(shí)現(xiàn)了一次復(fù)用的特性，克服了PDH準(zhǔn)同步復(fù)用方式對全部高速信號(hào)進(jìn)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(jìn)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(qiáng)大，具有較強(qiáng)的生存率。因SDH幀結(jié)構(gòu)中安排了信號(hào)的5％開銷比特，它的網(wǎng)管功能顯得特別強(qiáng)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(dòng)化、智能化、信道的利用率以及降低網(wǎng)絡(luò)的維管費(fèi)和生存能力起到了積極作用；廣州烽火CKU</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，以科技創(chuàng)新實(shí)現(xiàn)***管理的追求。騰云科創(chuàng)深耕行業(yè)多年，始終以客戶的需求為向?qū)?，為客戶提?**的SDH光傳輸設(shè)備，光端機(jī)，PCM接入設(shè)備，PTN OTN光傳輸設(shè)備。騰云科創(chuàng)繼續(xù)堅(jiān)定不移地走高質(zhì)量發(fā)展道路，既要實(shí)現(xiàn)基本面穩(wěn)定增長，又要聚焦關(guān)鍵領(lǐng)域，實(shí)現(xiàn)轉(zhuǎn)型再突破。騰云科創(chuàng)始終關(guān)注通信產(chǎn)品市場，以敏銳的市場洞察力以正確確認(rèn)，實(shí)現(xiàn)與客戶的成長共贏。</p></p><br /><p>文章來源地址: http://m.cdcfah.com/cp/1071159.html</p></div></div></div></div></div><div id="2wnidxt" class="page-right twoColRt"><div id="mqsum7u" class="box01 margin10 clearfix"><h3><a href="http://m.cdcfah.com/cp/">猜你喜歡</a></h3><div id="joacjie" class="recomPic likePro"><a 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