fluke 4300测试结果，RL总是失败，为何原因？...

<p>从机房配线架到端口模块，线缆为AMP超五类非屏蔽双绞线。FLUKE测试标准为 TIA 5e channel / UTP 100 Ohm cat 5e。测试时两端各接了1M的超五类跳线，结果RL和 RL @remote 两项指标总是faild，为何原因？而单独测试跳线是通过的。</p><p></p>

回波不过很可能是假线！

<p><span style="FONT-SIZE: 10.5pt; COLOR: #006677; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">回波损耗</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; COLOR: #006677; FONT-FAMILY: Verdana; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">(RL)</span><span style="FONT-SIZE: 10.5pt; COLOR: #006677; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">是测量因阻抗不匹配引起的信号反射。</span></p><p><span style="FONT-SIZE: 10.5pt; COLOR: #006677; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"><span style="FONT-SIZE: 10.5pt; COLOR: #006677; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">产生阻抗不匹配的原因有以下几种：</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; COLOR: #006677; FONT-FAMILY: Verdana; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;"><br/><br/>? </span><span style="FONT-SIZE: 10.5pt; COLOR: #006677; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">　双绞线质量差</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; COLOR: #006677; FONT-FAMILY: Verdana; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;"><br/>? </span><span style="FONT-SIZE: 10.5pt; COLOR: #006677; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">　不同厂家不同类型的线缆不匹配</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; COLOR: #006677; FONT-FAMILY: Verdana; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;"><br/>? </span><span style="FONT-SIZE: 10.5pt; COLOR: #006677; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">　线缆连接硬件不匹配</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; COLOR: #006677; FONT-FAMILY: Verdana; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;"><br/>? </span><span style="FONT-SIZE: 10.5pt; COLOR: #006677; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">　接头位置双绞线变形</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; COLOR: #006677; FONT-FAMILY: Verdana; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;"><br/>? </span><span style="FONT-SIZE: 10.5pt; COLOR: #006677; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">　线对分离，来自其它金属线或屏蔽层的影响</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; COLOR: #006677; FONT-FAMILY: Verdana; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;"><br/>? </span><span style="FONT-SIZE: 10.5pt; COLOR: #006677; FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">　外力对线缆束挤压变形</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; COLOR: #006677; FONT-FAMILY: Verdana; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;"><br style="mso-special-character: line-break;"/><br style="mso-special-character: line-break;"/>需要测试可以联系我！</span></span></p>

<p>3楼的见解深刻。</p><p>但是我感觉是你的跳线太短！</p>

回波损耗一般是由于端接不当引起的，你测跳线的时候当然是PASS的，因为跳很短嘛，但你不应该是看是不是通过，还要看一下余量是不是很大？如果虽然通过，但余量很小的话，跳线肯定是有问题的。<br/>还有就是这根线中间是否有接头哦，否些不太负责的工人中间接线的可能性还是有的。。<br/><br/>

<p>1.线缆和模块没有端接好</p><p>2.线缆跟机柜配线架这端没端接好</p><p>重新端接</p>

<p>分析的很实在。</p>

这个问题我在两个工程中都遇到了。把同批过来的线拉出50-60m来。单测一下，大部分是。网线的质量问题。

<p>产生的原因，三楼已经详细说了，解决故障的方法很简单，看故障的位置啊，FLUKE的测试仪，可以明确指出，RL没有通过的具体位置，如35米、47米或是1米等，根据出现故障的位置，在现场做出判断，是线缆原因，还是端接处的原因等。</p><p>更多资料和报告管理软件、样本，请到&nbsp;<a href="http://www.rdkm.cn">www.rdkm.cn</a> 查阅下载。</p>

<p>路过学习</p>

可能网带中途折叠太严重，不要放在轴上测试。

<p>上海及周边地区有需要进行FLUKE超五类、六类链路测试的朋友，可以联系我-13764560294，或加我QQ-81630393</p>

<p>失败可能的原因三楼已经分析的很清楚，fluke测试仪中有一个功能叫做HDTDR（高精度时域反射计）,这个功能很强，能够显示出RL失败的具体位置点，这个位置通常是在接头处，波形会有一点起伏，如果是在线中的位置就说明线的特性阻抗被破坏了，通常特性阻抗被破坏的原因三楼已经有过阐述，包括线缆可能被拉伸，扭曲导致了绞据的破坏，当然也有可能是跳线和布线以及模块阻抗不匹配（这通常是由于混用不同厂家的产品引起的）</p><p></p>

<p>学习了！！</p><p></p>

&nbsp;厉害

<p>学习</p><p></p>

３楼说的很好啊！４楼跳线不要短过０.５是没问题的

学习咯