光纖通信外文資料及翻譯(適用于外文翻譯中英文對(duì)照)-展示頁(yè)
2024-12-18 10:05本頁(yè)面
【正文】 電網(wǎng)系統(tǒng)的總體經(jīng)濟(jì)效益，通信系統(tǒng)的投資不應(yīng)過(guò)大，力爭(zhēng)充分利用現(xiàn)有的主網(wǎng)通信資源，進(jìn)行主、配網(wǎng)整體規(guī)劃，避免重復(fù)投資。 4雙向通信： 配網(wǎng) 自動(dòng)化要實(shí)現(xiàn)遙測(cè)、遙信、遙控功能，就必須要求具有雙向通信能力。 根據(jù)以上的要求，伴隨著光纖價(jià)格的下降，目前，光纖通信正廣泛地應(yīng)用于電力系統(tǒng)。該系統(tǒng)是以光纖為傳輸介質(zhì)，以光為載波信號(hào)傳遞信息的通信系統(tǒng)，應(yīng)用的光波波長(zhǎng)為 ～ 靘，整個(gè)系統(tǒng)由電端機(jī)、光端機(jī)、 l光纜和中繼器構(gòu)成。單模光纖比多模光纖傳輸距離長(zhǎng)，目前一般地，光信號(hào)在多模光纖內(nèi)可傳 6km 左右，在單模光纖內(nèi)可傳 30km。實(shí)用的光纖通常都是由多根光纖、加強(qiáng)芯、保護(hù)材料、固定材料等組合成光纜構(gòu)成的傳輸線。光纖 MODEM 一般有一個(gè)以上的數(shù)據(jù)口用以傳遞同步或異步信號(hào)。故足以滿足配網(wǎng)通信的需要。這一功能使通信的可靠性大大增強(qiáng)。 4 光纖通信的特點(diǎn) 光纖通信具有通信容量大，衰減小，不怕雷擊，抗電磁干擾、抗腐蝕、保密性好、可靠性高、敷設(shè)方便等優(yōu)點(diǎn)，不過(guò)投資費(fèi)用相對(duì)較高，尤其對(duì)于城區(qū)內(nèi)直埋式電纜線路的光纖敷設(shè)，施工費(fèi)用將更大。 根據(jù)配電自動(dòng)化系統(tǒng)的特點(diǎn)，光纖網(wǎng)通常需組成環(huán)型網(wǎng)，并與計(jì)算機(jī)局域網(wǎng)連接，實(shí)現(xiàn)數(shù)據(jù)共享?；緲?gòu)架為 1～ 3 個(gè) SDH／ STM1 雙纖自愈環(huán)相交或相切，而且在需要時(shí)，可通過(guò)更 l換光卡的方式在線升級(jí)為 SDH／ STM4。 6 結(jié)束語(yǔ) 在實(shí)際的配網(wǎng)自動(dòng)化的通信系統(tǒng)，必須構(gòu)建一個(gè)成本低、收效高的雙向通信系統(tǒng)，用可以接受的費(fèi)用在可靠性和信息流量方面提供非常高的性能。因此，在配電網(wǎng)自動(dòng)化系統(tǒng)中，要應(yīng)用多種通信方式，按綜合的經(jīng)濟(jì)技術(shù)指標(biāo)而選取其中最優(yōu)的組合。 l附件 2：外文原文（復(fù)印件） Optical fiber munication in power distribution automation applications onpaper1 Foreword The first phase in the evolution of munication works is dominated by thewide spread of telephony and covers over 90 years . However the telegraph preceded thetelephone by more than 30 years and the teletypewriter by half a century . In1844Samuel Morse the telegraph’s inventor sent the first telegraph message fromWashington . to his coleague Afred Vail in Baltimore Maryland. Shortly after theinvention of the telephone by Alexander Grahan Bell in 1876 it was realized thattelephone wires had to converge on central points where telephonetotelephoneconnections could be made .These points were manual switchboardStaffed by operator .This was followed by the introduction of electromechanicalswitching and in 1889Almond invented the first twomotion stepbstepswitch. The golden age of automatic telephony occurred after Word War ∏ when theentire longdistance work was automated .The invention of the transistor spurred the application ofElectronics to switching systems and led to the deployment of the first electronicswitching in the late 1950s . Electronic switching made it possible to design and buildswitches with greater capacity. The second phase of working which occurred in the 1960s included three majormilestones:software switching digital transmission and satellite The third phase of the evolution of munication works occurred in the 1970s andis characterized by the introduction of data works and packer switching achieve patibility between puters and packetswitched work theinternational Telegraph and Telephone Consultative Committee
研究報(bào)告相關(guān)推薦
鄂ICP備17016276號(hào)-1