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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>SDH光傳輸設(shè)備烽火STM-64,烽火</p><p><span>***更新：</span>2020-08-28 17:19:20</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="3bdk3qx" 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(xún)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(huà): </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(xiàn)] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="qew28k2" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="oxpcelx" class="box"><p><p> <p> 近些年，點(diǎn)播電視、多媒體業(yè)務(wù)和其他寬帶業(yè)務(wù)如雨后春筍般紛紛出現(xiàn)，為SDH應(yīng)用在接入網(wǎng)中提供了廣闊的空間。SDH技術(shù)應(yīng)用于接入網(wǎng)的好處是：1）對(duì)于要求高可靠、高質(zhì)量業(yè)務(wù)的大型企事業(yè)用戶(hù)，SDH可以提供較為理想的網(wǎng)絡(luò)性能和業(yè)務(wù)可靠性。2）可以將網(wǎng)管范圍擴(kuò)展至用戶(hù)端，簡(jiǎn)化維護(hù)工作。3）利用SDH固有靈活性，可使網(wǎng)絡(luò)運(yùn)營(yíng)者更快、更有效地提供用戶(hù)所需的長(zhǎng)期和短期業(yè)務(wù)需求。 </p> <p> 從技術(shù)上來(lái)看，接入層的相對(duì)帶寬需求較小，需要提供IP、TDM，SDH光傳輸設(shè)備烽火STM-64，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(zhuān)線(xiàn)、ATM ，SDH光傳輸設(shè)備烽火STM-64、IP 等業(yè)務(wù)的接入，SDH光傳輸設(shè)備烽火STM-64、傳送和保護(hù)。 </p> </p> <p> <br /> </p> <p> <br /> ADM是SDH**重要的一種網(wǎng)元，通過(guò)它可等效成其它網(wǎng)元。SDH光傳輸設(shè)備烽火STM-64</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="SDH光傳輸設(shè)備烽火STM-64,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845101689454/4175838.jpg"></div><p> SDH網(wǎng)絡(luò)的常見(jiàn)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(diǎn)處，例如鏈的中間結(jié)點(diǎn)或環(huán)上結(jié)點(diǎn)，是SDH網(wǎng)上使用**多、**重要的一種網(wǎng)元，它是一個(gè)三端口的器件。 </p> <p> ADM有兩個(gè)線(xiàn)路端口和一個(gè)支路端口。兩個(gè)線(xiàn)路端口各接一側(cè)的光纜（每側(cè)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(gè)線(xiàn)路端口。ADM的作用是將低速支路信號(hào)交叉復(fù)用進(jìn)東或西向線(xiàn)路上去，或從東或西側(cè)線(xiàn)路端口收的線(xiàn)路信號(hào)中拆分出低速支路信號(hào)。另外，還可將東/西向線(xiàn)路側(cè)的STM-N信號(hào)進(jìn)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(guò)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(gè)ADM可等效成兩個(gè)TM。光傳輸設(shè)備烽火STM-16分/插復(fù)用器用于SDH傳輸網(wǎng)絡(luò)的轉(zhuǎn)接站點(diǎn)處。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="SDH光傳輸設(shè)備烽火STM-64,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845101689454/9165528.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(guò)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(xiàn)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(shù)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(kāi)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(zhuān)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(guò)這個(gè)特殊節(jié)點(diǎn)轉(zhuǎn)接。 </p> <p> <br /> </p> <p> <br /> </p><p> 電源系統(tǒng)SDH設(shè)備采用一48伏直流電源，工作電壓應(yīng)滿(mǎn)足：輸入電壓范圍是-40V至-57V；電話(huà)衡量雜音電壓<2mV；峰峰值雜音電壓(0．300Hz)_<400mV。 </p> <p> 根據(jù)公式：電流=功率／電壓。各設(shè)備正常工作時(shí)的比較大電流等于滿(mǎn)配置功耗除以工作電壓。比較大電流再加上適當(dāng)富余量取整可得所需熔絲大小。 </p> <p> 時(shí)鐘同步系統(tǒng) </p> <p> SDH網(wǎng)元時(shí)鐘源的種類(lèi) </p> <p> (1)外部時(shí)鐘源——由SETPI功能塊提供輸入接口； </p> <p> (2)線(xiàn)路時(shí)鐘源一由SPI功能塊從STM．N線(xiàn)路信號(hào)中提??； </p> <p> (3)支路時(shí)鐘源——由PPI功能塊從PDH支路信號(hào)中提取，不過(guò)該時(shí)鐘一般不用，因?yàn)镾DH／PDH網(wǎng)邊界處的指針調(diào)整會(huì)影響時(shí)鐘質(zhì)量； </p> <p> (4)設(shè)備內(nèi)置時(shí)鐘源由SETS功能塊提供。 </p> <p> <br /> 網(wǎng)絡(luò)節(jié)點(diǎn)設(shè)備（網(wǎng)元）和傳輸線(xiàn)路的幾何排列就構(gòu)成了網(wǎng)絡(luò)的拓?fù)浣Y(jié)構(gòu)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="SDH光傳輸設(shè)備烽火STM-64,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244847651777344/7289118.jpg"></div><p style="text-indent:25px">凈負(fù)荷區(qū)用于存放真正用于信息業(yè)務(wù)的比特和少量的用于通道維護(hù)管理的通道開(kāi)銷(xiāo)字節(jié)；管理單元指針用來(lái)指示凈負(fù)荷區(qū)內(nèi)的信息首字節(jié)在STM－N幀內(nèi)的準(zhǔn)確位置以便接收時(shí)能正確分離凈負(fù)荷。SDH的幀傳輸時(shí)按由左到右、由上到下的順序排成串型碼流依次傳輸，每幀傳輸時(shí)間為125μs，每秒傳輸1／125×1000000幀，對(duì)STM－1而言每幀字節(jié)為8bit×（9×270×1）=19440bit，則STM－1的傳輸速率為19440×8000=155.520Mbit／s；而STM－4的傳輸速率為4×155.520Mbit／s=622.080Mbit／s；STM－16的傳輸速率為16×155.520（或4×622.080）=2488.320Mbit／s。段，相當(dāng)于一條大的傳輸通道。江蘇烽火STM-16</p><p style="text-indent:25px">同時(shí)也使網(wǎng)絡(luò)運(yùn)行靈活、安全、可靠，使網(wǎng)絡(luò)的功能非常齊全和多樣化；SDH光傳輸設(shè)備烽火STM-64</p><p> 環(huán)網(wǎng)——自愈環(huán) </p> <p> 自愈環(huán)的分類(lèi) </p> <p> 目前環(huán)形網(wǎng)絡(luò)的拓?fù)浣Y(jié)構(gòu)用得很多，因?yàn)榄h(huán)形網(wǎng)具有較強(qiáng)的自愈功能。自愈環(huán)的分類(lèi)可按保護(hù)的業(yè)務(wù)級(jí)別、環(huán)上業(yè)務(wù)的方向、網(wǎng)元節(jié)點(diǎn)間光纖數(shù)等來(lái)劃分。 </p> <p> 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(lèi)；按網(wǎng)元節(jié)點(diǎn)間的光纖數(shù)可將自愈環(huán)劃分為兩纖環(huán)（一對(duì)收/發(fā)光纖）和四纖環(huán)（兩對(duì)收發(fā)光纖）；按保護(hù)方式還可將自愈環(huán)劃分為通道保護(hù)環(huán)和復(fù)用段保護(hù)環(huán)兩大類(lèi)。 </p> <p> 對(duì)于通道保護(hù)環(huán)，業(yè)務(wù)的保護(hù)是以通道為基礎(chǔ)的，也就是保護(hù)的是STM-N信號(hào)中的某個(gè)VC通道，根據(jù)環(huán)上的某一個(gè)別通道信號(hào)的傳輸質(zhì)量來(lái)決定是否倒換，通常利用收端是否收到簡(jiǎn)單的AIS信號(hào)來(lái)決定該通道是否應(yīng)進(jìn)行倒換。 </p> <p> 復(fù)用段倒換環(huán)是以復(fù)用段為基礎(chǔ)的，根據(jù)環(huán)上傳輸?shù)膹?fù)用段信號(hào)的質(zhì)量決定是否倒換。倒換是由K1、K2（b1～b5）字節(jié)所攜帶的APS協(xié)議來(lái)啟動(dòng)的。復(fù)用段保護(hù)倒換的觸發(fā)條件是LOF、LOS、MS-AIS告警信號(hào)。 </p> <p> 通道保護(hù)環(huán)的倒換無(wú)需APS協(xié)議，采用“并發(fā)優(yōu)收”的倒換機(jī)理---簡(jiǎn)單。 </p> <p> 復(fù)用段保護(hù)環(huán)要使用APS協(xié)議，倒換機(jī)理---較復(fù)雜。 SDH光傳輸設(shè)備烽火STM-64</p><p style="text-indent:25px">深圳市騰云科創(chuàng)信息咨詢(xún)有限公司是一家電力設(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(xiāo)售與安裝，設(shè)備維護(hù)及板件返修，以及各設(shè)備可配置的單板，用戶(hù)電纜，中繼電纜等)、辦公設(shè)備、五金交電、化工原料（不含危險(xiǎn)及監(jiān)控化學(xué)品）的銷(xiāo)售；經(jīng)濟(jì)信息咨詢(xún)；經(jīng)營(yíng)進(jìn)出口業(yè)務(wù)。的公司，創(chuàng)建于2015-10-29。騰云科創(chuàng)擁有一支經(jīng)驗(yàn)豐富、技術(shù)創(chuàng)新的專(zhuān)業(yè)研發(fā)團(tuán)隊(duì)，以高度的專(zhuān)注和執(zhí)著為客戶(hù)提供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)致力于把技術(shù)上的創(chuàng)新展現(xiàn)成對(duì)用戶(hù)產(chǎn)品上的貼心，為用戶(hù)帶來(lái)極致體驗(yàn)。騰云科創(chuàng)始終關(guān)注通信產(chǎn)品市場(chǎng)，以敏銳的市場(chǎng)洞察力以正確確認(rèn)，實(shí)現(xiàn)與客戶(hù)的成長(zhǎng)共贏。</p></p><br /><p>文章來(lái)源地址: http://m.cdcfah.com/cp/1073417.html</p></div></div></div></div></div><div id="lfcuwyf" class="page-right twoColRt"><div id="i3399gi" class="box01 margin10 clearfix"><h3><a href="http://m.cdcfah.com/cp/">猜你喜歡</a></h3><div id="eyq7s3c" class="recomPic likePro"><a 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