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	<title>专注福禄克测试仪销售与技术 &#187; fluke，dsx8000</title>
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		<title>我的布线系统能支持PoE++等级8吗(功率损耗)？</title>
		<link>http://www.faxytech.com/archives/poe-class8.html</link>
		<comments>http://www.faxytech.com/archives/poe-class8.html#comments</comments>
		<pubDate>Tue, 17 Sep 2019 05:23:11 +0000</pubDate>
		<dc:creator>深圳连讯</dc:creator>
				<category><![CDATA[技术专栏]]></category>
		<category><![CDATA[fluke，dsx8000]]></category>
		<category><![CDATA[PoE]]></category>
		<category><![CDATA[福禄克]]></category>

		<guid isPermaLink="false">http://www.faxytech.com/?p=11060</guid>
		<description><![CDATA[我的布线系统能支持PoE++等级8吗(功率损耗)？ &#160; 关键参数 DSX8000测试电阻的不平衡 环路电阻 ● 线路损耗=I2R 平均最大，线路电阻过大 PD min不满足要求 ● Type4：1580-2120mA 4p 线路损耗14W （ &#60;... ]]></description>
			<content:encoded><![CDATA[<p>我的布线系统能支持<span class='wp_keywordlink_affiliate'><a href="http://www.faxytech.com/tag/poe" title="查看 PoE 的全部文章" target="_blank">PoE</a></span>++等级8吗(功率损耗)？</p>
<p>&nbsp;</p>
<p><strong>关键参数</strong></p>
<p><strong><a href="http://www.faxytech.com/wp-content/uploads/2019/09/DSX8000-UBL.jpg" class="highslide-image" onclick="return hs.expand(this);"><img class="alignnone size-full wp-image-11061" title="DSX8000测试电阻的不平衡" src="http://www.faxytech.com/wp-content/uploads/2019/09/DSX8000-UBL.jpg" alt="" width="264" height="358" /></a></strong></p>
<p><strong><span class='wp_keywordlink'><a href="http://www.faxytech.com/archives/dsx8000.html" title="福禄克FLUKE DSX8000">DSX8000</a></span>测试电阻的不平衡<br />
</strong></p>
<p><strong>环路电阻</strong></p>
<p>● 线路损耗=I2R 平均最大，线路电阻过大 PD min不满足要求</p>
<p>● Type4：1580-2120mA 4p 线路损耗14W （ &lt; 18.7W max，PoE++ ）</p>
<p>● 现有标准 loop resistance 25Ω，均满足要求</p>
<p>● 使用超长28AWG跳线链路：100-110m？</p>
<p>✓ 实测Channel或安装前仿真Channel</p>
<p>&nbsp;</p>
<p><strong>超标嫌疑：&gt; 26 AWG</strong></p>
<p>● 缩短应用距离 ( channel length &lt;100m ）</p>
<p>●  TIA上浮10% -&gt;110m？</p>
<p>●  坚持Loop resistance &lt;25Ωo 28 AWG？</p>
<p>✓ 缩短长度设计</p>
<p>&nbsp;</p>
<p>我的布线系统能支持PoE++等级8吗？</p>
<p><a href="http://www.faxytech.com/wp-content/uploads/2019/09/Loop-r.jpg" class="highslide-image" onclick="return hs.expand(this);"><img class="alignnone size-full wp-image-11067" title="Loop-r" src="http://www.faxytech.com/wp-content/uploads/2019/09/Loop-r.jpg" alt="" width="762" height="397" /></a></p>
<p>所有四对线 &lt; 25 Ω(单线近似&lt;12.5Ω)</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
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