光纖通信外文資料及翻譯(適用于外文翻譯+中英文對照)-文庫吧
2025-11-02 10:05 本頁面
【正文】 議設計為相切 環(huán)，以調度中心為切點；如果局調度中心局域網偏離網絡地理中心，建議設計為相交環(huán)，由于調度中心不在交點，為了環(huán)間可靠轉接，各環(huán)相交至少兩點，互為保護路由。 6 結束語 在實際的配網自動化的通信系統，必須構建一個成本低、收效高的雙向通信系統，用可以接受的費用在可靠性和信息流量方面提供非常高的性能。同時，由于配電網自動化系統所要完成的功能太多而系統復雜，采用單一的通信系統來滿足所有的功能需要是不現實的，也是不經濟的。因此，在配電網自動化系統中，要應用多種通信方式，按綜合的經濟技術指標而選取其中最優(yōu)的組合。在電力系統中 較常用的通信方式還有一點多址數字微波、數傳電臺、無線擴頻、專線電纜、郵電本地網、載波、擴頻載波等，可供組網時選擇。 l附件 2：外文原文（復印件） 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 CCITT from the Frenchacronym established a wordstandard protocol called in 1976. This phase ofworking is also characterized by the introduction and wide acceptance of local areaworksLANs. The invention of the laser which stands for light amplification bysimulated emission of radiation in 1959 led to major technical developments in the fieldof optical munication. 1970 Corning Glass Works r
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