【正文】 s vertical LAN, the horizontal work is very costly to upgrade. Installations always mean serious disruption to normal work for a building39。損壞的管道可以切去進行修理，并且損壞的部分也可以用新的管替換它。 對于 10 Gbs 的工作，延長工作 50/125μ m 的光纖電纜是必需的。普通多模光纖的折射率分布并不遵循跨越核心直徑的理想拋物的變化。這些薄弱接收信號可以從發(fā)射器耦合器淹沒不需要的信號。這一切都意味著 費用。很多時候，這個網(wǎng)絡的一部分，是用光纖實現(xiàn)的。不過，如果你想從機箱外面進入網(wǎng)絡，那么有一個新的連接方式稱為工業(yè) RJ45。T 使用同一個解決方案。每 4對 D 類線纜將被匯聚在一個標準 RJ45 (8位 )信息插座，以便使每個墻面板需要安置四個 RJ45信息插座。 較大的電子元器件，需要全幀計算機機架。充分批量的 語音通信電纜冒口 應該被部署，以滿足當前和預計的需求。 我們將提出一種戰(zhàn)略和結構化布線，這將是當今標準的最具成本效益的解決方案。對大廈垂直 LAN的所有變動，可能通常與現(xiàn)有的網(wǎng)絡服務平行實施，因此到桌面的服務的中斷可以被保留到極小值。但是，一旦確立，隨著這個系統(tǒng)的經(jīng)濟改善，只得通過重新設計的電纜，這導致在管道中 5類， 5e 類、 6類和 7類線纜的生產(chǎn)?；蛟S最重要的是將考慮 6類線纜提供的相當?shù)蛶挼母倪M。 VCSEL 激光器有沿光纖中心近軸射線發(fā)射的能力，它是使用擴展帶寬光纖的理想助手。這是一種藉以沿著傳統(tǒng)布線的輸送管道安裝光纖的技術。s Integrated Services Digital Network. This includes wallplates, wire for the horizontal distribution and the voice/data wiring closet modular cross connection equipment.It is remended that wire runs be less than 230 feet from the voice/data wiring closet to the wall station. Horizontal Distribution Wire amp。D to be worthwhile. Worst case predictions for category 7 at 10gigabit speeds imply a length restriction of about 25m. This would be a severe limitation. Any improvement will be at the expense of costlier transceivers. In any event, these distance constraints at higher data rates are onerous for UTP cabling. Category 7 then, must be at least a fibre solution? Optical Technology Optical technology, on the other hand, is already advanced. It has been improved by the development of extended bandwidth multimode fibre and by the development of the VCSEL laser. The refractive index profile of ordinary multimode fibre does not follow the ideal parabolic variation across the diameter of the core. These fibres have a small index discontinuity located at the axis of the fibre that prevents paraxial rays from being transmitted efficiently. These are the rays that suffer least dispersion and it is low dispersion that permits higher signalling rates to be used. Extended bandwidth multimode fibres have been developed with an improved refractive index profile. They have increased the distance over which gigabit ether may be transmitted by multimode fibres to about 1km. The VCSEL laser is capable of launching paraxial rays along the centre of an optical fibre and is the ideal plement to the use with extended bandwidth fibre. Traditionally, copper works have been cheaper than their optical counterparts, but as data rates increase, the costs of installing these media will converge. This is likely to happen at rates of about Gbs. The Future Obviously, all predictions about future requirements are fraught with difficulty and we must rely heavily on past experience. Errors of judgement when dealing with the horizontal working are expensive and have long lasting consequences. There is usually only one chance to get it right as the lifetime for horizontal wiring is 10 years or more. By way of contrast, the lifetime of a . is about 2 3 years and that of an ether switch 3 5 years. In view of this, it is crucial that the right choices are made for horizontal cabling. For 10 Mbs working, copper category 3 cabling is quite adequate. For 100 Mbs working, copper category 5 cabling is required. For 1 Gbs working, copper category 5e cabling is required. For 10 Gbs working, extended working 50/125181。s when work speeds were dictated by the rotor speed of mechanical mechanisms (clunketyclunk teletypes), the works have seen a monotonous rise in data rates. The rise has followed Moore39。它是由預安裝管道保護的免受損壞。通過對比的方式， PC 機的壽命約為 2 3年，而以太交換機 3 5年。 這必將是一個非常殘酷的限制。 相對較大的外部串擾影響著弱信號 ,尤其是在線纜末端附近。不同于建筑物的垂直局域網(wǎng) ,水平網(wǎng)絡的升級是非常昂貴。 網(wǎng)絡的單調上升 1980年以來的數(shù)據(jù)傳輸速率，當網(wǎng)絡速度被由（ clunkety 彈響電傳打字機）機械轉速機制決定時，網(wǎng)絡已經(jīng)看到了數(shù)據(jù)傳輸速率的單調上升。 它還提供了一些可以用來為商業(yè)企業(yè)設計通訊產(chǎn)品 的 信息。數(shù)據(jù)線將安裝在適當?shù)臋C架式數(shù)據(jù)硬件（如 3274控制器，以太網(wǎng)橋箱等），而語音線（如可能）則將安裝到機架式語音硬件。附件 1 外文資料翻譯譯文： 綜合布線的未來 JHMI(約翰斯霍普金斯醫(yī)學研究所 )前提的分配計劃將與由 AT＆ T的前提分配制度和國際標準組織的綜合業(yè)務數(shù)字網(wǎng)指定的標準相一致。由于兩 個分開的組織維護同一組相同的線纜，這將 分離 作用 并且使混亂減到最小 。本標準的目的是指定一個通用的、能夠支持多產(chǎn)品，多廠商環(huán)境的商業(yè)建筑物電信布線系統(tǒng)。我們現(xiàn)在應該做什么，可以保證我們新的網(wǎng)絡設施不會成為未來(或許 一點也不遙遠 )的傳統(tǒng)網(wǎng)絡。高帶寬或關鍵比特率應用例如 VOIP，視頻流，