<p class="MsoNormal" align="center" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center;"><b style="mso-bidi-font-weight: normal;"><span style="FONT-SIZE: 16pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman';">水滴反射的<font color="#ffffff" style="BACKGROUND-COLOR: #000000;">光</font></span></b><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-SIZE: 16pt;"><p></p></span></b></p><p class="MsoNormal" align="right" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: right;"><b style="mso-bidi-font-weight: normal;"><span style="FONT-SIZE: 16pt; FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">———综合布线中的小问题</span></b></p><p class="MsoNormal" align="left" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: right;"><b style="mso-bidi-font-weight: normal;"><span style="FONT-SIZE: 16pt; FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";"></span></b></p><shapetype id="_x0000_t75" stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" opreferrelative="t" ospt="75" coordsize="21600,21600"><stroke joinstyle="miter"></stroke><formulas><f eqn="if lineDrawn pixelLineWidth 0"></f><f eqn="sum @0 1 0"></f><f eqn="sum 0 0 @1"></f><f eqn="prod @2 1 2"></f><f eqn="prod @3 21600 pixelWidth"></f><f eqn="prod @3 21600 pixelHeight"></f><f eqn="sum @0 0 1"></f><f eqn="prod @6 1 2"></f><f eqn="prod @7 21600 pixelWidth"></f><f eqn="sum @8 21600 0"></f><f eqn="prod @7 21600 pixelHeight"></f><f eqn="sum @10 21600 0"></f></formulas><path oconnecttype="rect" gradientshapeok="t" oextrusionok="f"></path><lock aspectratio="t" vext="edit"></lock></shapetype><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><shape id="_x0000_s1027" type="#_x0000_t75" style="MARGIN-TOP: 4.25pt; Z-INDEX: 2; LEFT: 0px; MARGIN-LEFT: 0px; WIDTH: 477pt; POSITION: absolute; HEIGHT: 306pt; TEXT-ALIGN: left;"><p><imagedata otitle="expo-2008" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image001.jpg"></imagedata><wrap type="square"></wrap></p><p><wrap type="square"></wrap></p></shape></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"></p><span lang="EN-US" style="FONT-SIZE: 15pt;"><p></p></span><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0;"><span lang="EN-US"><p><font face="Times New Roman"> </font></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0;"><span lang="EN-US"><font face="Times New Roman">2008</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">年注定要在历史上抹下浓重的一笔，这一年中所发生的事每一件都让人民难以忘记。</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">“</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">2008</font></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">年中国国际信息通信展览会（</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">P&T/EXPO COMM CHINA 2008</font></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">）”</span><span style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">
</font></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">于</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">2008</font></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">年</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">12</font></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">月</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">21</font></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">至</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">25</font></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">日在北京的中国国际展览中心新馆盛大举行，给业界带来一次轰动。此次展会以“融合、变革、机遇”为主旋律，是</span><span lang="EN-US" style="mso-bidi-font-size: 10.5pt;"><font face="Times New Roman">2008</font></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">年亚洲规模最大、最具影响力的信息通信展之一，</span><span lang="EN-US"><font face="Times New Roman">2008</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">国际信息通信展览会的展出的很多鲜为人知的产品和技术走上了或即将走上应用的舞台。</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0;"><span lang="EN-US"><p><font face="Times New Roman"> </font></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0;"><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">这次的展览会对综合布线行业提出了更高的要求。因为我们常听到客户这样的抱怨：我在做机房布设的时候，所选择的设备是一流的，机房的各项配备也是一流的，但是组建起来的机房却没有达到预期的效果。网速慢、信息弱，有的时候甚至还会丢数据。设备没有问题，各项配备环境也没有问题，但到底是哪里出了问题呢？</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0;"><span lang="EN-US"><p><font face="Times New Roman"> </font></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0;"><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">其实，如果设备没有问题，各项配备环境也没有问题，那么一定是设备之间的连接出了问题。因为我们在很多时候关注设备，关注环境，而忽略了一个最基本的问题：只有通过线缆的连接设备才会发挥它的作用。线缆连接不达标，将直接影响到整个网络的性能。</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0;"><span lang="EN-US"><p><font face="Times New Roman"> </font></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0;"><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">线缆，通常情况下，一种是同轴电缆（在逐渐被淘汰），另一种为双绞线。</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0;"><span lang="EN-US"><p><font face="Times New Roman"> </font></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0;"><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">双绞线是</span><span lang="EN-US"><font face="Times New Roman">8</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">根不同颜色的线分成</span><span lang="EN-US"><font face="Times New Roman">4</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">个线对绞合在一起，这样做可以更多在减少整个网络受电磁辐射与外部电磁干扰的影响。双绞线按照是否外加金属屏蔽层分为屏蔽双绞线（</span><span lang="EN-US"><font face="Times New Roman">STP</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">——</span><span lang="EN-US"><font face="Times New Roman">Shielded Twisted Pair</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">）和非屏蔽双绞线（</span><span lang="EN-US"><font face="Times New Roman">UTP</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">——</span><span lang="EN-US"><font face="Times New Roman">Unshielded Twisted Pair</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">）。金属屏蔽双绞线又分为：金属丝网编织屏蔽双绞线和金属箔屏蔽双绞线两种，利用金属屏蔽层的反射、吸收及趋肤效应，实现防止电磁干扰及抗电磁辐射的功能。目前，大多数的用户在组建网络时，使用的都是非屏蔽双绞线。</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0;"><span lang="EN-US"><p><font face="Times New Roman"> </font></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0;"><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">双绞线在</span><span lang="EN-US"><font face="Times New Roman">EIA/TIA</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">—</span><span lang="EN-US"><font face="Times New Roman">586</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">标准中，非屏蔽双绞线按照电气特性和传输带宽又被分为：三类线，四类线，五类线，超五类线，六类线和七类线。目前常用的是三类线，五类线和超五类线，不过三类线正在逐步被淘汰。从这次展览会上看，六类线、七类线正在被越来越多的使用，因为现在网络要求千兆、万兆或更快的传输速率，光纤到桌面也不只是口头上说说了，“光进铜退”的呼声也越来越高，这些都将成为一种趋势。</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0;"><span lang="EN-US"><p><font face="Times New Roman"> </font></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0;"><shape id="_x0000_s1026" type="#_x0000_t75" style="MARGIN-TOP: 23.4pt; Z-INDEX: 1; LEFT: 0px; MARGIN-LEFT: 279pt; WIDTH: 180pt; POSITION: absolute; HEIGHT: 126.75pt; TEXT-ALIGN: left;"><font face="Times New Roman"><imagedata otitle="45" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image003.jpg"></imagedata><wrap type="square"></wrap></font></shape><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">线缆一定要选用好的线缆，那么线的连接也就是常说的水晶头也一定要用好的。水晶头，专业术语叫</span><span lang="EN-US"><font face="Times New Roman">RJ</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">—</span><span lang="EN-US"><font face="Times New Roman">45</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">连接器（</span><span lang="EN-US"><font face="Times New Roman">8</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">芯网络用的）和</span><span lang="EN-US"><font face="Times New Roman">RJ</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">—</span><span lang="EN-US"><font face="Times New Roman">11</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">连接器（</span><span lang="EN-US"><font face="Times New Roman">4</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">芯电话线用），连接器是线缆和设备之间很重要的一环，比如<b style="mso-bidi-font-weight: normal;"><u>北京鼎志新业电子技术有限公司（</u></b></span><b style="mso-bidi-font-weight: normal;"><u><span lang="EN-US"><font face="Times New Roman">DINTEK</font></span></u></b><b style="mso-bidi-font-weight: normal;"><u><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">）</span></u></b><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">生产的水晶头针脚采用了</span><span lang="EN-US"><font face="Times New Roman">100</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">μ″镀镍，</span><span lang="EN-US"><font face="Times New Roman">50</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">μ″镀金，背面的小卡刺可以弯曲到</span><span lang="EN-US"><font face="Times New Roman">150</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">°，弯曲次数也是目前其他同类产品所不能比的，更重要的是采用三个针脚（</span><span lang="EN-US"><font face="Times New Roman">3 Prong</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">），当你用压线钳卡线的时候正好能卡在线的两边，而不会卡在线中，这样既增大了接触面又不会卡断线。就这一环，如果不达标往往会对整个网络的性能造成很大的影响。</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0;"><span lang="EN-US"><p><font face="Times New Roman"> </font></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0;"><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">另外在布线安装方面，也有一定的考究。虽然线缆的设计都对抗耐抻拉和弯曲采取一定的保护措施，但要是不注意或者弯曲不当，都可能使线缆在数据传输时，对串扰和阻抗带来负面影响，这样即使设备和各项配备再好也可能造成网速慢、信号弱的现象。</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0;"><span lang="EN-US"><p><font face="Times New Roman"> </font></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0;"><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">总之，任何一个环节不达标，都全影响整个网络的性能。这就给布线行业提出更高的要求，特别是展会上</span><span lang="EN-US"><font face="Times New Roman">HSDPA</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman";">的演示，让更多的布线厂家对自己的标准又上一个台阶。</span></p> |
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