光纖通信外文資料及翻譯(適用于外文翻譯+中英文對照)-全文預(yù)覽
【正文】 70 年代，以數(shù)據(jù)網(wǎng)絡(luò)和分組交換技術(shù)的引進為特征?？祵幑饫w實驗室發(fā)布第一個低能耗光纖，可以實現(xiàn) 20Db/km 損耗。在近幾 年國家加大了對城網(wǎng)和農(nóng)網(wǎng)的改 l造，國內(nèi)各大供電局對配電網(wǎng)自動化的投入也在加大。配網(wǎng)系統(tǒng)擁有眾多的開閉所、配電變壓器、柱上斷路器，要對這些設(shè)備進行監(jiān)控就需要許多 FTU 和 TTU，同時這些 FTU 隨配電設(shè)備安裝，地域分布廣，通訊節(jié)點分散。 3尋址量大： 通信系統(tǒng)不僅要考慮目前及未來的數(shù)據(jù)傳輸?shù)男枰?，還要考慮系統(tǒng)升級的要求。 3 光纖通信 自激光器和低損耗光纖問世以來，光纖通信系統(tǒng)以其技術(shù)、經(jīng)濟上無可比擬的優(yōu)越性而迅速崛起，并風(fēng)靡全球。因此，單模光設(shè)備的價格要高于多模光設(shè)備。通信速率可達到 2Mbps 或更高，配網(wǎng)常用的通信速率一般為同步 N64K 或異步 19200bps 以下。使通信不受影響，同時向主站發(fā)出相應(yīng)的告警及定位信號，使維修人員及時修復(fù)故障段光纜。 實際工程設(shè)計中，充分考慮到電力通信專網(wǎng)拓撲結(jié)構(gòu)的復(fù)雜性， SDH 傳輸系統(tǒng)可以采用多達 126 個 E12M 口全交叉連接和雙主光環(huán)多光分支的設(shè)計思想。同時，由于配電網(wǎng)自動化系統(tǒng)所要完成的功能太多而系統(tǒng)復(fù)雜，采用單一的通信系統(tǒng)來滿足所有的功能需要是不現(xiàn)實的，也是不經(jīng)濟的。 In addition there is a doubleloop fiber optic MODEM with selfhealing function. This feature greatly enhance the reliability of the munication. the signalis not affected while the main station to send the appropriate alarm andpositioning signals so that maintenance personnel section of cable fault the characteristics of optical fiber municationLarge capacity optical fiber munication with the munication theattenuation is small not afraid of lightning antielectromagic interferencecorrosion resistance confidentiality reliability and easy installation but therelatively high investment costs especially for inner city buried cable lines fiberlaying construction costs will be optical fiber munication implementations in distribution worksOptical fiber munications work formation is very flexible and can frame intoa star chain tree mesh single fiber work dualfiber work ringmultibranch multiring intersection tangent and other multiring to the characteristics of distribution automation systems fiber optic ring usually made up of work and puter local area work connectiondata She Ji practical engineering the fully take into account the special worktopology power structure of munication plexity SDH transmissionsystems can use up to 126 E1 2M I Quan cross Lian Jie He pairs the mainbranch of halo more than the design of Si Xiang Guang. The basic framework of1 to 3 SDH/STM1 dualfiber selfhealing intersect or tangent and whennecessary can change the way light card online upgrade SDH/STM4. If theBureau of the work control center is located in the geographical center of theLAN the proposed design for the tangent to the ring to dispatch center as thecutoff point if the Board deviated from the work control center LANgeographical center of the proposed design for the intersection ring because notdispatch center i
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