【正文】 視頻會(huì)議和計(jì)算機(jī)輔助設(shè)計(jì) (CAD)，正逐漸變得普遍。 由于從纜繩的輻射 ，越來越多的信號(hào) 強(qiáng)度 以高數(shù)據(jù)速率的 形式損耗 。 7類線 的最壞預(yù)言情況 是達(dá)到 10吉比特速度 后 暗示 著線纜長度 限制為 大約 25m。但通常只有一個(gè)得到正確的機(jī)會(huì)，因?yàn)樗讲季€的壽命是 10年或更多點(diǎn)。 氣吹光纖是“原始”（直徑約 ）的光纖。s standards. We will examine: The Implications for future work design， What is likely to be technically achieved， What will we require in the cabling infrastructure. Summary The advantages offered by high specification copper cabling (category 6 or 7) in data works are likely to be limited and short lived. In order to avoid serious work disruptions in the future and save costly reworking, optical fibre to the desktop deserves serious consideration for new projects. This is also a business critical decision which could impact on your petitiveness. We should do what we can now to ensure our new work installations do not bee the legacy works of the (perhaps none too distant) future. Monotonous Rise in Network Data Rates since the 198039。m fibre optic cabling is required If, as trends suggest, we may expect 10 Gbs operation within the lifetime of the wiring and in view of the fact that horizontal wiring is expensive to alter, we should try to make any current installation as so called futureproof as we can. As the solution offered by improved copper cabling is likely to be transient and is likely to be just as expensive as fibre, we need to consider the provision of fibre for all new work. If, because of current cost, fibre is not actually installed in any given project, at the very least, space provision in the cable containment ought to be made in order to accommodate its future adoption. One way of achieving this without laying any actual fibre is to make use of blown fibre conduits. This is a technique whereby conduits for fibres are installed alongside traditional wiring. They may subsequently be brought into operation by using pressed air to blow fibres down the preinstalled conduits to their destination. This has the following advantages: There is minimal disturbance to decoration. There is minimal disruption to the normal working patterns of the building39。 Wallplates ATamp。他們隨后可能會(huì)投入使用，通過使用壓縮空氣將光纖吹入預(yù)裝管道下到目的地。 傳統(tǒng)上，銅網(wǎng)絡(luò)比他們的光學(xué)相應(yīng)物便宜，但是，當(dāng)數(shù)據(jù)速率增加時(shí)，安裝這些媒介的費(fèi)用將聚合。 網(wǎng)絡(luò)帶寬不斷上升的預(yù)期將很快超過它 ， 通過把可提供 的 Gbs 1的 理論 投入使用 。這些改進(jìn)已促使 10兆， 100兆和 1吉 UTP 以太網(wǎng)的發(fā)展。正因?yàn)槿绱耍捎诰W(wǎng)絡(luò)服務(wù)的中斷對(duì)組織成本的影響，可以保持小規(guī)模。 我們將會(huì)研究： 未來網(wǎng)絡(luò)設(shè)計(jì)的影響； 什么將會(huì)有可能在技術(shù)上實(shí)現(xiàn)； 在布線基礎(chǔ)設(shè)施中 我們需要什么。再次，現(xiàn)有建筑物的布線將需要考慮到可行性評(píng)估。這些機(jī)架將支持 ISDN（綜合業(yè)務(wù)數(shù)字網(wǎng)），以太網(wǎng)和令牌環(huán)組件。每個(gè)語音 /數(shù)據(jù)長城站將達(dá)到四對(duì)“ D”類電纜的要求。在這一點(diǎn)上，然而，很有可能是JHMI 要和 ATamp。并且，如果您安裝的 一切符合美國電器制造商協(xié)會(huì)額定的范圍內(nèi)，那么什么都不需要變的。 這種建筑物局部區(qū)域網(wǎng)絡(luò)（ LAN）是關(guān)鍵業(yè)務(wù)的一部分 ，但是幸運(yùn)地，它是相對(duì)地容易對(duì)它做變動(dòng) 的。提供電源、音頻 /數(shù)據(jù)線纜所采取的處理必須控制在足夠并且美觀程度上。在連接器上 ,相對(duì)高功率的信號(hào) 被 發(fā)射 進(jìn) 非?？拷?到 接收的電纜 ,沿著電纜長度輻射損失已經(jīng)開始減弱。擴(kuò)展帶寬多模光纖和VCSEL 激光器的發(fā)展已經(jīng)促使光學(xué)技術(shù)改進(jìn)。 對(duì)于 1 Gbs 工作，銅 5e 類電纜是必需的。 輸送管道是小的，并且 可以通過傳統(tǒng)的線纜包含進(jìn)行運(yùn)載 。 it is just a matter of time before we start receiving demands for gigabit working at the desktop. High bandwidth/critical bit rate applications such as VOIP, video streaming, video conferencing and puter aided design (CAD), are being mon. Unlike the building39。s occupants, so this sort of activity is normally undertaken when there is a major refurbishment of the fabric. Cableways have to be formed in, on or under walls, floors and ceilings. The installers have to ensure that results are not unsightly but inevitably there is damage to the amenity value of the rooms through which cables have to pass. Care has to be taken to provide adequate and presentable cable containment for both power and voice/data cables. This all means expense. The cost of ownership is high. It was precisely because of these high costs that unshielded twisted pair (UTP) ether was developed. This permitted the use of existing, low grade, category 3 telephone cabling within buildings. Strenuous efforts have been made to improve the bandwidth capabilities of this popular medium. However, once firmly established, economic improvements to this system could be made only by redesign of the cable, leading to the production of category 5, 5e and 6 cables with category 7 in the pipeline. These improvements have enabled the development of 10megabit, 100megabit and 1gigabit et