<p class="MsoNormal" align="left" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto;"><span style="FONT-SIZE: 11pt; COLOR: #222222; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体;">一段距离为<chmetcnv wst="on" unitname="m" sourcevalue="200" hasspace="True" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">200 m</span></chmetcnv>以内的线路的时候,可以非标准的使用双绞线进行布线,但具体应采用以下方法: <span lang="EN-US">
<p></p></span></span></p><p class="MsoNormal" align="left" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto;"><span style="FONT-SIZE: 11pt; COLOR: #222222; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体;"> (<span lang="EN-US">1</span>)为保证整体网络的速度,可以使用接口为<span lang="EN-US">10</span>/<span lang="EN-US">100 Mb</span>/<span lang="EN-US">s</span>自适应的交换机,但将与这条双绞线连接的交换机端口强制设为<span lang="EN-US">10 Mb</span>/<span lang="EN-US">s</span>和全双工模式。 <span lang="EN-US">
<p></p></span></span></p><p class="MsoNormal" align="left" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto;"><span style="FONT-SIZE: 11pt; COLOR: #222222; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体;"> (<span lang="EN-US">2</span>)采用五类或超五类双绞线布线,提高施工工艺,尽量避开强干扰源,以减少线缆性能参数的下降。 <span lang="EN-US">
<p></p></span></span></p><p class="MsoNormal" align="left" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto;"><span style="FONT-SIZE: 11pt; COLOR: #222222; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体;"> 在实际工程中,对使用一段长度约<chmetcnv wst="on" unitname="m" sourcevalue="200" hasspace="True" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">200 m</span></chmetcnv>的双绞线进行连接的计算机进行测试: <span lang="EN-US">
<p></p></span></span></p><p class="MsoNormal" align="left" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto;"><span style="FONT-SIZE: 11pt; COLOR: #222222; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体;"> <span lang="EN-US">①</span>使用<span lang="EN-US">IE</span>浏览器访问<span lang="EN-US">Internet</span>正常; <span lang="EN-US">
<p></p></span></span></p><p class="MsoNormal" align="left" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto;"><span style="FONT-SIZE: 11pt; COLOR: #222222; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体;"> <span lang="EN-US">②</span>使用<span lang="EN-US">ping</span>程序进行测试,<span lang="EN-US">10 min</span>丢包率为<span lang="EN-US">0</span>%。结果证明以上基于傅里叶的分析是合理的。 <span lang="EN-US">
<p></p></span></span></p><p class="MsoNormal" align="left" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 16pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto;"><span style="FONT-SIZE: 11pt; COLOR: #222222; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体;"> 另外,本方法也可以适用于早期的<span lang="EN-US">3</span>类双绞线或由于线缆品质低及布线工艺较差造成无法在<span lang="EN-US">10</span>/<chmetcnv wst="on" unitname="m" sourcevalue="100" hasspace="True" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">100 M</span></chmetcnv>自适应网络中使用的情况,可以降低成本并减少重新布线的麻烦。当然如果双绞线的长度进一步增加,那么直流阻抗及其他参数对总功率的衰减,可能会造成接收设备无法检测到信号,所以这种依靠降低速度来实现通信的手段只能在一定的范围内使用。<span lang="EN-US">
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