光纖通信外文資料及翻譯(適用于外文翻譯中英文對(duì)照)(存儲(chǔ)版)
【正文】 nic 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 reported on the first lowlossoptical fiber dopedsilica clad fiber that achieved 20 dB/km loss. The fourth phase of munication working which began in 1980 ischaracterized by the availability of the integrated services digital works ISDN andmobile munications. With the development of national economy and peoples living standardsimprove peoples growing demand for electricity while the reliability and powerquality of power supply put forward higher requirements. Feeder Automation isthe reliability of power supply distribution work systems to improve the mostdirect and effective means of technology. Countries has increased in recent yearson the city work and the transformation of rural power work power supplybureaus of the major domestic investment in distribution automation is alsoincreasing. Achieved in the distribution work automation process we foundthat munication problems is a difficult problem. In this just from the fiberopticmunication works in automation applications with little knowledge aboutand Distribution Automation requirements for munication SCADA system with the same dispatch distribution automation system alsoneeds an effective munication work and he has his own characteristics:the number of terminals very much. System has a large distribution work bylopening and closing power distribution transformers circuit breakers column tomonitor these devices requires a number of FTU and TTU while the FTU with thepower distribution equipment installation wide geographical
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