【正文】 s length. These weak receive signals can be swamped by the unwanted coupled signal from the transmitter. To overe these difficulties, more has to be spent in the design of the transceiver hardware. The cost of these items will rise as bandwidth is increased. Category 6 cable has been developed in order to address some of these problems but, at the moment, no standards have been ratified. Apart from these fluid aspects of copper solutions, there are other factors regarding their choice that should be borne in mind. Perhaps the most important consideration is the rather low bandwidth improvement that category 6 cable will offer. The ever rising expectations of work bandwidth will soon overtake the Gbs1 theoretical through put that it may provide. The respite that it may give is likely to be short. There are further worries about its interoperability and its backward patibility with existing installations. Category 7 cable is still under development and many experts in the industry believe the Ramp。s Law closely in the past but recently, it has shown evidence of an acceleration faster than that predicted by the law. Onegigabit data rates are available now and 10gigabit rates are predicted by 2021. Vertical LAN In any building distribution, the vertical work carries about 80% of the traffic. This part of a building local area work (LAN) is business critical but fortunately, it is relatively easy to make changes to it. Quite often, this part of the work is realised as optical fibre. At one time, the bandwidth offered by optical fibre was regarded as unlimited but that is not the case now. For example, at 1gigabit rates, there is a length limit of about 220m when using popular about 500m when using 50/125181。T Premise Distribution System and the International Standards Organization39。它比傳統(tǒng)的由熟悉的塑料護套包裝的光纖電纜更便宜。一種實現(xiàn)這一沒有鋪設(shè)任何實際的光纖的方法就是是使用“ 氣吹光纖 ”導管。鑒于此 ,正確的選擇水平布線是至關(guān)重要的。他們又提高了在多模光纖上可傳播的吉比特以太網(wǎng)的距離到大約1km。所有的改善將是在犧牲更加昂貴的收發(fā)器的基礎(chǔ)上。除了這些“流動的”方面的銅解決方案 ,還應該牢記影響他們的選擇的其他因素。數(shù)據(jù)線纜分享鄰近的包含總線布線的電纜這是極為重要的。為改善這種大眾媒體的帶寬能力已付出了艱苦的努力。施工總是意味著嚴重擾亂了大樓居住者的正常工作，因此這類活動通常是，有主要的結(jié)構(gòu)性翻新工程時才進行的。更遠的距離意味著單模光纖的使用。在過去，上升趨勢始終密切遵循“摩爾定律”，但最 近，它提供的證據(jù)表明速度加速快于由定律預測的。規(guī)范體也需要時間批準 6類線，因此導致在產(chǎn)業(yè)之內(nèi)的不確定性。 在 EIA/TIA568 標準包括 EIA/ 一般要求，EIA/， EIA/。 在每幢樓至少將安裝一根 ，以便為將來的數(shù)據(jù)通信使用。但是，如果需求發(fā)生變化，基本接線廠商將能夠支持，無論是語音或數(shù)據(jù)的技術(shù)。其中每項主要的前提計劃推薦在19機架上安裝電子設(shè)備。 這包括護墻板的水平布線分布，和語音 /數(shù)據(jù)配線間交叉連接設(shè)備的模塊化。 垂直配電線路和語音 /數(shù)據(jù)配線間 配線間一般都部署在每一層樓。數(shù)據(jù)線將端接于其中一組面板，而語音線則在另一塊。 每棟建筑到互連的地下 室至少兩根粗纜以太網(wǎng)段 (貝爾登 9880或同等材質(zhì) )才能貫穿。 結(jié)構(gòu)化布線系統(tǒng) (SCS）最簡單地說就是，在 安裝時基于遵循 EIA / TIA 568規(guī)范定義的標準，網(wǎng)絡規(guī)劃和商業(yè)建筑布線方法。這些規(guī)范由 EIA/TIA 和 ODV（開放是數(shù)字視頻）開發(fā)并且是幾乎已經(jīng)完成。這也可能是對您競爭性沖擊的企業(yè)重要決定。有一段時間，通過光纖提供的帶寬，被認為是無限的，但事實并非這樣。事實上， 1吉比特網(wǎng)絡接口卡 (NIC)現(xiàn)在已經(jīng)開始進行傳輸；我 們開始接受在桌面吉比特網(wǎng)絡的需求之前，它只是時間問題。承包商的成本高。它們是： 金屬導體磁化率的屬性的溫度波動。 為 了克服這些困難，在收發(fā)器的硬件設(shè)計方面必須投入更多。 7類線纜目前仍處于研發(fā)階段，但在許多業(yè)內(nèi)專家來看 ，研發(fā)是值得的。這些光纖在位于光纖的軸處有一個不連續(xù)的小指標 ,以防止近 軸射線被及時有效的傳達。當處理水平網(wǎng)絡時，錯誤判斷將帶來昂貴而持久的后果。 如果，作為趨向建議，我們也許期待在布線的壽命之內(nèi) 10Gbs 的操作，然而，事實上，水平布線是昂貴的改變，我們應該盡我 們所能設(shè)法使當前的裝置作為所謂“面向未來的”。它允許將開支推遲。 因為光纖具有成熟的優(yōu)勢技術(shù) ,大大優(yōu)于電噪聲 免疫、本質(zhì)電氣安全 ,優(yōu)越的帶寬能力 ,數(shù)據(jù)高度安全性，通過長距離攜帶數(shù)據(jù)的能力允許在“主干”的拓撲結(jié)構(gòu)中使用，所以它的用途或潛在的用途應該在所有新線纜施工時認真被考慮。T solution. A minimum of two ThickWire Ether segments (Belden 9880 or equivalent) will be run through each building to the interconnecting basements. Loops should be left on each floor for future instal cable must have readily available access (. not run in conduit) to insure future use. A minimum of one d in each building riser for future data munications use. Sufficient bulk voice munications riser cable should be run to meet the current and projected requirements. Again, the wiring of existing buildings will need to be evaluated with feasibility in mind. In many buildings the basement wiring closet will act as an intermediate distribution frame back to the main wiring frame. Interbuilding linkswill probably be run using fiber optic cable especially to increase the bandwidth of the data munications works. A Structured Cabling System (SCS) most simply stated is based on following a standard methodology defined by EIA/TIA 568 specifications when planning and installing work cabling for mercial buildi