【正文】 the applications, and paratively easy to install versus other available media types.With advancements in network speeds, new transmission specifications for UTP cable and connecting hardware have been promoted by manufacturers and eventually endorsed by the standards munity. In 1991, the highest rated bandwidth over UTP was 16 MHz。t increase by a large amount. The data packets, with which the voice packets ride, will increase bandwidth requirements. The requirements to transport large amounts of information in shorter and shorter periods of time are changing, and will continue to change. Applications such as graphical data (both schematic and pictorial), scientific modeling, desktop videoconferencing, multitiered relational databases and other dataintensive information will drive up the bandwidth requirements.If history is any predictor of the future, we will see information transfer speeds increase at least one order of magnitude per decade. We have seen local area network speeds, on UTP, increase from 10 Mb/s in the mid 1980s to 100 Mb/s in the mid 1990s then to 1 Gb/s in the late 1990s. Today, standards are being written for 10 Gb/s. Where will we be in 2010 or 2020? Microsoft39。在1984年初，當(dāng)時(shí)被稱為通信布線系統(tǒng)，并沒有被過多的討論。自從1991年電信行業(yè)協(xié)會(huì)/電子工業(yè)聯(lián)盟，共同發(fā)表了一系列關(guān)于綜合布線系統(tǒng)的標(biāo)準(zhǔn)和規(guī)范。什么樣的媒介和適配器能用較少的花費(fèi)達(dá)到超過1GHz的帶寬？為什么雙絞線的經(jīng)濟(jì)性已不如其它媒介？新的方向在我們能預(yù)見的未來(lái)里，商業(yè)信息的傳遞包括低速和高速兩種要求。那么到2010年或2020年那？正如微軟的比爾蓋茨說過的“我們?cè)?0年內(nèi)將有無(wú)限的帶寬”。在六類標(biāo)準(zhǔn)出臺(tái)之前，許多技術(shù)障礙都沒有得到解決。其特點(diǎn)是光譜帶寬的頻率在600MHz。為了提高光纖的承載能力，攜帶數(shù)據(jù)的激光通過光纖玻璃時(shí)可以被分成不同的顏色，或者更準(zhǔn)確地稱為波長(zhǎng)，每個(gè)波長(zhǎng)都是離散數(shù)據(jù)通道。但是塑料光纖并不被所有的機(jī)構(gòu)所認(rèn)可，原因是當(dāng)前的技術(shù)僅局限于50米的傳輸距離。無(wú)線網(wǎng)絡(luò)的特點(diǎn)，迷住了那些參與了設(shè)計(jì)，安裝和維護(hù)綜合布線系統(tǒng)的人。毫無(wú)疑問，隨著無(wú)線網(wǎng)絡(luò)的成本的減少和帶寬的增加，無(wú)線網(wǎng)絡(luò)可以被廣泛的應(yīng)用。無(wú)線技術(shù)無(wú)疑會(huì)促進(jìn)和繼續(xù)支持更大的帶寬要求。他們也應(yīng)該了解到，所有正在研發(fā)的新標(biāo)準(zhǔn)。采用新的多模光纖和單模光纖，短波長(zhǎng)與長(zhǎng)波長(zhǎng)傳輸，并使用波分復(fù)用的的爭(zhēng)論仍在繼續(xù)。除非有需要降低電磁干擾的要求，大多數(shù)用戶都無(wú)法承受比非屏蔽雙絞線高出300%價(jià)格的屏蔽雙絞線。IEEE 達(dá)到11Mb/s的傳輸速率。同軸電纜可以組建10Base5和10Base2的以太網(wǎng)。這樣可以很容易的增加帶寬。同時(shí)它還需要訓(xùn)練有素的安裝人員。如果未來(lái)的技術(shù)并不能提高帶寬利用效率，那么電子產(chǎn)品的成本，安裝詳圖及測(cè)試需求成本的可能會(huì)減少雙絞線的優(yōu)點(diǎn)相對(duì)于其它潛在的媒介。然而它們遠(yuǎn)遠(yuǎn)落后于非屏蔽雙絞線在實(shí)際當(dāng)中的應(yīng)用。在越來(lái)越短的時(shí)間內(nèi)傳輸大量信息的需求正在增加，并將繼續(xù)擴(kuò)大。之所以雙絞線成為新選擇的媒介，是因?yàn)樗?jīng)濟(jì)，非常適合應(yīng)用，且相對(duì)易于安裝與其他現(xiàn)有的媒體設(shè)備。在1984年1月，美國(guó)的法院頒布的幾個(gè)重要裁決改變了電信業(yè)務(wù)的提供和分配結(jié)構(gòu)。s look at the proposed solutions for future requirements. Unshielded twistedpairCurrently, standards are being solidified to extend the transmission characterization of UTP to 250 MHz. Many manufacturers are advertising the availability of products that exceed yettoberatified specifications. Many technical hurdles have to be solved before a Category 6 standard is published. However, it is reasonable to expect that these hurdles both technical and political will be resolved. It is generally recognized that UTP has not yet been pushed to its theoretical limits. The question yet remains as to the continued viability of UTP as information speeds increase.If future technology does not improve the efficiency of bandwidth utilization, then the cost of the electronics, installation detail, and the testing requirements may diminish UTP39。 Maintenance Magazine 文獻(xiàn)、資料發(fā)表（出版）日期: 院（部）: 信息與電氣工程學(xué)院 專 業(yè): 電子信息工程 班 級(jí): 姓 名: 學(xué) 號(hào): 指導(dǎo)教師: 翻譯日期: w外文文獻(xiàn)： The future of structured cabling syste