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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>北京烽火780A</p><p><span>***更新：</span>2020-05-27 04:37:21</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="zoqsoqs" 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="g23rip8" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="bahelne" class="box"><p><p> 電力網(wǎng)的發(fā)展對(duì)電力系統(tǒng)**通信網(wǎng)提出了更高的要求, 電力通信要求確保電能的生產(chǎn)、輸送、分配、消費(fèi)在瞬間是同時(shí)完成的。為了保證電網(wǎng)安全、經(jīng)濟(jì)地運(yùn)行, 必須配置調(diào)度、保護(hù)、遠(yuǎn)程控制等系統(tǒng)。這些系統(tǒng)的所有信息傳輸都必須由通信系統(tǒng)提供通道。由此可見, 通信在電力系統(tǒng)中的作用是非常關(guān)鍵的。隨著經(jīng)濟(jì)的發(fā)展, 電力系統(tǒng)容量急劇增加, 隨之而來的是輸電超高壓化, 接入業(yè)務(wù)多樣化。 </p> <p> 電力系統(tǒng)一旦發(fā)生故障, 如果通信不暢, 不能及時(shí)調(diào)度指揮,就會(huì)擴(kuò)大***范圍, 造成大面積停電甚至系統(tǒng)瓦解,不僅經(jīng)濟(jì)損失十分慘重, 而且會(huì)給社會(huì)造成嚴(yán)重影響。因此電力系統(tǒng)的通信要有非常高的可靠性。由于SDH技術(shù)具有特有的優(yōu)勢(shì), 采用SDH技術(shù)組網(wǎng)不僅適合現(xiàn)代通信發(fā)展的需要,而且特別適合電力系統(tǒng)通信的需要。SDH網(wǎng)是由不同類型的SDH網(wǎng)元設(shè)備, 如終端復(fù)用設(shè)備(TM )、再生器(REG)、分插復(fù)用設(shè)備(ADM )、數(shù)字交叉連接(DXC) 設(shè)備等, 通過光纜互連而成的，北京烽火780A, 由這些網(wǎng)元設(shè)備完成SDH 網(wǎng)的上下業(yè)務(wù)，北京烽火780A、交叉連接業(yè)務(wù)、網(wǎng)絡(luò)故障自愈等傳送功能。SDH網(wǎng)的網(wǎng)絡(luò)節(jié)點(diǎn)(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)的基本拓?fù)浣Y(jié)構(gòu)大致有這樣幾種方式: 鏈形，北京烽火780A、星形、樹形、環(huán)形和網(wǎng)格形等。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="北京烽火780A" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845105136719/8556415.jpg"></div><p> SDH的缺點(diǎn)， </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(huì)相應(yīng)的使有效性降低。例如，收音機(jī)的選擇性增加，可選的電臺(tái)就增多，這樣就提高了選擇性。但是，由于這時(shí)頻帶相應(yīng)的會(huì)變窄，必然會(huì)使音質(zhì)下降，也就降低了可靠性。 </p> <p> 2，指針調(diào)整機(jī)理復(fù)雜。 </p> <p> SDH體制可以從高速信號(hào)（STM-1）中直接下低速信號(hào)（例如2Mbit/s），省去了多級(jí)復(fù)用，解復(fù)用過程，這種功能的實(shí)現(xiàn)是通過指針機(jī)理來完成的。但是，指針功能的實(shí)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(dòng)—由指針調(diào)整引起的結(jié)合抖動(dòng)。 </p> <p> 3，軟件的大量使用對(duì)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(duì)系統(tǒng)的影響也是致命的。 </p> <p> <br /> </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="北京烽火780A" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845102001954/2472236.jpg"></div><p> SDH網(wǎng)絡(luò)的常見網(wǎng)元和功能 </p> <p> DXC——數(shù)字交叉連接設(shè)備 </p> <p> 數(shù)字交叉連接設(shè)備完成的主要是STM-N信號(hào)的交叉連接功能，它是一個(gè)多端口器件，它實(shí)際上相當(dāng)于一個(gè)交叉矩陣，完成各個(gè)信號(hào)間的交叉連接。 </p> <p> DXC可將輸入的m路STM-N信號(hào)交叉連接到輸出的n路STM-N信號(hào)上，上圖表示有m條入光纖和n條出光纖。DXC的**是交叉連接，功能強(qiáng)的DXC能完成高速（例STM-16）信號(hào)在交叉矩陣內(nèi)的低級(jí)別交叉（例如VC12級(jí)別的交叉）。 </p> <p> 通常用DXCm/n來表示一個(gè)DXC的類型和性能（注m≥n），m表示可接入DXC的比較高速率等級(jí)，n表示在交叉矩陣中能夠進(jìn)行交叉連接的比較低速率級(jí)別。m越大表示DXC的承載容量越大；n越小表示DXC的交叉靈活性越大。 </p> <p> <br /> </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="北京烽火780A" src="https://tyunfile.71360.com/UploadFile/sztykc/637244847724550782/6753357.jpg"></div></p><br /><p>文章來源地址: http://m.cdcfah.com/cp/52952.html</p></div></div></div></div></div><div id="q3ahzls" class="page-right twoColRt"><div id="sh8nkmt" class="box01 margin10 clearfix"><h3><a 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