光纖通信外文資料及翻譯(適用于外文翻譯中英文對(duì)照)-資料下載頁(yè)
【導(dǎo)讀】話主導(dǎo)著通訊網(wǎng)絡(luò)的第一個(gè)階段并貫通了90多年。但是，電報(bào)領(lǐng)先于電話30多。年，打字機(jī)領(lǐng)先于電話半個(gè)世紀(jì)。1844年，電報(bào)的發(fā)明者，塞繆爾-莫爾斯從華盛。頓發(fā)送第一條電報(bào)給他在馬里蘭-巴爾的摩的同事—韋爾。這些點(diǎn)是手動(dòng)開(kāi)關(guān)板，有值班操作員控制。1889年，第一個(gè)雙端可動(dòng)的步進(jìn)交換機(jī)產(chǎn)生。第二次世界大戰(zhàn)之后，整個(gè)長(zhǎng)途網(wǎng)。絡(luò)自動(dòng)化后，自動(dòng)電話進(jìn)入了黃金期。晶體管的發(fā)明推動(dòng)了電子在交換系統(tǒng)中的運(yùn)。建成的交換機(jī)擁有更大的容量。包含三個(gè)主要的里程碑：軟件，數(shù)字交換，和衛(wèi)星的發(fā)射部署。標(biāo)準(zhǔn)的協(xié)議，稱為。年，光纖的產(chǎn)生在光通信領(lǐng)域帶來(lái)了跨越式的技術(shù)發(fā)展?？祵幑饫w實(shí)驗(yàn)室發(fā)布第一。隨著國(guó)家經(jīng)濟(jì)的發(fā)展和人民生。同時(shí)，盡量避免各種電磁干擾，保證長(zhǎng)期穩(wěn)定可靠。地工作，并要求在線路停電時(shí)，通信系統(tǒng)仍能正常工作。3光纖通信自激光器和低損耗光纖問(wèn)世以來(lái)，光纖通信系統(tǒng)以其技術(shù)、經(jīng)濟(jì)上。無(wú)可比擬的優(yōu)越性而迅速崛起，并風(fēng)靡全球。修人員及時(shí)修復(fù)故障段光纜。
【正文】 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 intersection in order to reliably between the adapter ring the ringat least two points intersect each other to protect ConclusionIn the actual distribution automation munication system must build alow cost high effective twoway munication system with acceptablereliability and cost of information flow to provide very high because of distribution automation system functions to be acplishedby too many plex systems a single munication system to meet the needsof all of the functions is unrealistic and it is not economical. Thereforepower distribution automation system to apply a variety of municationmethods according to a prehensive economic and technical indicators andselecting the best bination of them. In the power system more monlyused multiple means of munication also point digital microwave radio datatransmission wireless spread spectrum green cables posts andtelemunications local work carrier Spread Spectrum etc. for theselection
鄂ICP備17016276號(hào)-1