双绞能代替视频线吗...

<p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><p>以前好多人说五类线能完全代替视频线，而且抗干扰比视频线好得多哟．</p></span></p>

<p>是的，用双绞线视频传输器就可以完成！楼主倒有先见之明！</p>

<p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;&nbsp;</span><span style="FONT-SIZE: 9pt;">双绞线传输的特点和自身优势，几年来的宣传已经无以复加，有过之而无不及。夹杂的虚假误导宣传，在安防行业造成了很多误区。我们在推出<span lang="EN-US">EIE</span>品牌<span lang="EN-US">“</span>加权平衡传输器<span lang="EN-US">”</span>的同时，也希望同行朋友能在以下几个方面客观的看待双绞线传输技术： <span lang="EN-US"><p></p></span></span></p><p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;&nbsp;&nbsp;&nbsp;1</span><span style="FONT-SIZE: 9pt;">）双绞线价格相对便宜，也具有应用上的自身特点和优点。但这种便宜的代价是：传输特性差，需要付出更大的补偿代价；代价一是，要实现有效距离内的完全补偿，传输设备需要具备更强的补偿能力，复杂度和性能都要大幅度提高，价格不可能很便宜；代价二是，有严重通道缺陷的传输器价格便宜，却要付出传输质量降低的工程代价，这个<span lang="EN-US">“</span>代价<span lang="EN-US">”</span>是厂商转嫁给工程商承担的；<span lang="EN-US">
                                <p></p></span></span></p><p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;&nbsp;&nbsp;&nbsp;2</span><span style="FONT-SIZE: 9pt;">）双绞线方式的传输距离，理论上和实践上都要比同轴电缆传输少很多，工程设计必须有个清醒的认识；<span lang="EN-US">①</span>在没有传输设备、只用线缆传输的情况下比较：<span lang="EN-US">75-5</span>同轴电缆在<chmetcnv wst="on" unitname="米" sourcevalue="120" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">120</span>米</chmetcnv>左右以内，可以实现<span lang="EN-US"><a href="http://hc360.kkeye.com/Tds/TDStatInfo.dll?Stat&amp;UI=43&amp;WI=165&amp;AI=5705&amp;DI=1055233&amp;WD=标准&amp;CT=2&amp;Url=http%3A%2F%2Fwww%2Esearch%2Ehc360%2Ecom%2Fcgi%2Dbin%2Fseinterface%2Ecgi%3Fclass%3D%B9%A9%D3%A6%D0%C5%CF%A2%26word%3D%B1%EA%D7%BC" target="_blank"><span lang="EN-US"><span lang="EN-US">标准</span></span></a></span>通道的传输质量，<chmetcnv wst="on" unitname="米" sourcevalue="300" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">300</span>米</chmetcnv>之内，图像接受度也很高，而双绞线没有传输设备却<span lang="EN-US">“</span>寸步难行<span lang="EN-US">”</span>；<span lang="EN-US">②</span>在有传输设备情况下比较：<span lang="EN-US">75-5</span>同轴电缆在<chmetcnv wst="on" unitname="米" sourcevalue="2000" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">2000</span>米</chmetcnv>以内，无前端无中继，只需要用一个末端加权视频恢复设备，就可以实现全补偿的标准通道传输特性，<chmetcnv wst="on" unitname="m" sourcevalue="6" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">6M</span></chmetcnv>频率补偿能力需要<span lang="EN-US">40-43db</span>（<span lang="EN-US">100</span>多倍）<span lang="EN-US">;</span>而<chmetcnv wst="on" unitname="米" sourcevalue="2000" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">2000</span>米</chmetcnv>双绞线，却必须有前后双端传输设备，要实现全补偿，<chmetcnv wst="on" unitname="m" sourcevalue="6" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">6M</span></chmetcnv>频率设备的补偿能力需要<span lang="EN-US">92-100db</span>（<span lang="EN-US">10</span>万多倍），目前还没见过哪家的产品能够做到这一点；<span lang="EN-US">③</span>前后双端都有传输设备，<span lang="EN-US">75-5</span>同轴电缆可以在<chmetcnv wst="on" unitname="米" sourcevalue="3000" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">3000</span>米</chmetcnv>以内实现全补偿；<span lang="EN-US">
                                <p></p></span></span></p><p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;&nbsp;&nbsp;&nbsp;3</span><span style="FONT-SIZE: 9pt;">）双绞线在合适的工程场合，可以实现一条电缆传输<span lang="EN-US">4</span>路图像，性价比较高；但盲目设计，也可能出现一条电缆<span lang="EN-US">4</span>对双绞线只传输一路信号的尴尬局面；工程设计一定要坚持根据现场情况，合理组合不同传输方式的原则；<span lang="EN-US">
                                <p></p></span></span></p><p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;&nbsp;&nbsp;&nbsp;4</span><span style="FONT-SIZE: 9pt;">）双绞线方式的平衡传输原理，使它具有较高的共模抑制特性，也具有较好的抗干扰能力。但还没有理论和实验证实，它的抑制干扰能力比同轴电缆还要强，更不能相信所谓<span lang="EN-US">“</span>具有超强的抗干扰能力<span lang="EN-US">”</span>等一些不实之词。因为平衡是相对的有限的，电路的共模抑制有效工作范围并不大。所以实际工程应用中，当出现干扰情况后，便束手无策。这就是用户常说的<span lang="EN-US">“</span>根本不像原来说的那么好<span lang="EN-US">”</span>；正因为这样，<span lang="EN-US">ET3030</span>和<span lang="EN-US">ET3050</span>加权平衡传输器，采用了加权抗干扰专利<span lang="EN-US"><a href="http://hc360.kkeye.com/Tds/TDStatInfo.dll?Stat&amp;UI=43&amp;WI=165&amp;AI=5522&amp;DI=1055233&amp;WD=技术&amp;CT=2&amp;Url=http%3A%2F%2Fwww%2Esearch%2Ehc360%2Ecom%2Fcgi%2Dbin%2Fseinterface%2Ecgi%3Fclass%3D%B9%A9%D3%A6%D0%C5%CF%A2%26word%3D%BC%BC%CA%F5" target="_blank"><span lang="EN-US"><span lang="EN-US">技术</span></span></a></span>，把双绞线抑制干扰的能力提高<span lang="EN-US">4-15</span>倍以上，可以解决一些常见的干扰；<span lang="EN-US">
                                <p></p></span></span></p><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: &quot;Times New Roman&quot;; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">&nbsp;&nbsp;&nbsp;&nbsp;5</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">）实验表明，双绞线线对之间的</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: &quot;Times New Roman&quot;; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">“</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">串扰</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: &quot;Times New Roman&quot;; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">”</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">规律是：频率越高串扰越大，不是</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: &quot;Times New Roman&quot;; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">“</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">相互毫无影响</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: &quot;Times New Roman&quot;; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">”</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">；工程设计时，还要慎重对待，一切都要有科学实验来证实</span>

<p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="FONT-SIZE: 9pt;">超<span lang="EN-US">5</span>类双绞线说明： <span lang="EN-US"><p></p></span></span></p><p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;&nbsp;&nbsp;&nbsp;1.</span><span style="FONT-SIZE: 9pt;">低频：指几十千赫兹以下的频率，<chmetcnv wst="on" unitname="米" sourcevalue="1000" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">1000</span>米</chmetcnv>衰减<span lang="EN-US">—7.2db(43.65%),<chmetcnv wst="on" unitname="米" sourcevalue="1500" hasspace="False" negative="False" numbertype="1" tcsc="0">1500<span lang="EN-US"><span lang="EN-US">米</span></span></chmetcnv><span lang="EN-US">衰减—10.8db(28.8%),<chmetcnv wst="on" unitname="米" sourcevalue="2000" hasspace="False" negative="False" numbertype="1" tcsc="0">2000<span lang="EN-US"><span lang="EN-US">米</span></span></chmetcnv><span lang="EN-US">衰减—14.4db(19%); <p></p></span></span></span></span></p><p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;&nbsp;&nbsp;&nbsp;2.</span><span style="FONT-SIZE: 9pt;">高频<chmetcnv wst="on" unitname="m" sourcevalue="5.8" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">5.8M</span></chmetcnv>，<chmetcnv wst="on" unitname="米" sourcevalue="1000" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">1000</span>米</chmetcnv>衰减<span lang="EN-US">45.69db</span>（<span lang="EN-US">0.52%</span>），<chmetcnv wst="on" unitname="米" sourcevalue="1500" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">1500</span>米</chmetcnv>衰减<span lang="EN-US">—68.53db(3.7*10-4),<chmetcnv wst="on" unitname="米" sourcevalue="2000" hasspace="False" negative="False" numbertype="1" tcsc="0">2000<span lang="EN-US"><span lang="EN-US">米</span></span></chmetcnv><span lang="EN-US">衰减—91.38db(2.7*10-5) <p></p></span></span></span></p><p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="FONT-SIZE: 9pt;">为了方便多数熟悉同轴传输而对双绞线传输还陌生的朋友，这里再给出同轴电缆的传输特性实测数据，以便在比较中加深理解：<span lang="EN-US">
                                <p></p></span></span></p><p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;&nbsp;&nbsp;&nbsp;75-5</span><span style="FONT-SIZE: 9pt;">电缆<chmetcnv wst="on" unitname="米" sourcevalue="1000" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">1000</span>米</chmetcnv>传输衰减和频率失真实测<span lang="EN-US"><a href="http://hc360.kkeye.com/Tds/TDStatInfo.dll?Stat&amp;UI=43&amp;WI=165&amp;AI=4685&amp;DI=1052780&amp;WD=数据&amp;CT=2&amp;Url=http%3A%2F%2Fwww%2Esearch%2Ehc360%2Ecom%2Fcgi%2Dbin%2Fseinterface%2Ecgi%3Fclass%3D%B9%A9%D3%A6%D0%C5%CF%A2%26word%3D%CA%FD%BE%DD" target="_blank"><span lang="EN-US"><span lang="EN-US">数据</span></span></a>
                                <p></p></span></span></p><p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="FONT-SIZE: 9pt;">低频<span lang="EN-US">:3.95db</span>；<chmetcnv wst="on" unitname="m" sourcevalue=".5" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">0.5M</span></chmetcnv><span lang="EN-US">:6.43db</span>；<chmetcnv wst="on" unitname="m" sourcevalue="1" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">1M</span></chmetcnv><span lang="EN-US">:8.78db</span>；<chmetcnv wst="on" unitname="m" sourcevalue="2" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">2M</span></chmetcnv><span lang="EN-US">:12.2db</span>；<chmetcnv wst="on" unitname="m" sourcevalue="4" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">4M</span></chmetcnv><span lang="EN-US">:17.7db</span>；<chmetcnv wst="on" unitname="m" sourcevalue="4.8" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">4.8M</span></chmetcnv><span lang="EN-US">:19.7db</span>；<chmetcnv wst="on" unitname="m" sourcevalue="5.8" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">5.8M</span></chmetcnv><span lang="EN-US">:21.7db <p></p></span></span></p><p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;&nbsp;&nbsp;&nbsp;[75-5<a href="http://hc360.kkeye.com/Tds/TDStatInfo.dll?Stat&amp;UI=43&amp;WI=165&amp;AI=7634&amp;DI=1052780&amp;WD=电缆&amp;CT=2&amp;Url=http%3A%2F%2Fwww%2Esearch%2Ehc360%2Ecom%2Fcgi%2Dbin%2Fseinterface%2Ecgi%3Fclass%3D%B9%A9%D3%A6%D0%C5%CF%A2%26word%3D%B5%E7%C0%C2" target="_blank"><span lang="EN-US"><span lang="EN-US">电缆</span></span></a></span><span style="FONT-SIZE: 9pt;">说明<span lang="EN-US">]</span>：<span lang="EN-US">
                                <p></p></span></span></p><p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;&nbsp;&nbsp;&nbsp;1.</span><span style="FONT-SIZE: 9pt;">低频：<chmetcnv wst="on" unitname="米" sourcevalue="1000" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">1000</span>米</chmetcnv>衰减<span lang="EN-US">—3.95db(63.5%)</span>；<chmetcnv wst="on" unitname="米" sourcevalue="1500" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">1500</span>米</chmetcnv>衰减<span lang="EN-US">—5.925db(50%)</span>；<chmetcnv wst="on" unitname="米" sourcevalue="2000" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">2000</span>米</chmetcnv>衰减<span lang="EN-US">—7.9db(40%)</span>；<span lang="EN-US">
                                <p></p></span></span></p><p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;&nbsp;&nbsp;&nbsp;2.</span><span style="FONT-SIZE: 9pt;">高频<chmetcnv wst="on" unitname="m" sourcevalue="5.8" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">5.8M</span></chmetcnv>，<chmetcnv wst="on" unitname="米" sourcevalue="1000" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">1000</span>米</chmetcnv>衰减<span lang="EN-US">21.7db</span>（<span lang="EN-US">8.2%</span>）；<chmetcnv wst="on" unitname="米" sourcevalue="1500" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">1500</span>米</chmetcnv>衰减<span lang="EN-US">—32.55db(2.36%)</span>；<chmetcnv wst="on" unitname="米" sourcevalue="2000" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">2000</span>米</chmetcnv>衰减<span lang="EN-US">—43.4db(0.676%)</span>；<span lang="EN-US">
                                <p></p></span></span></p><p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;[</span><span style="FONT-SIZE: 9pt;">比较<span lang="EN-US">] <p></p></span></span></p><p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;&nbsp;&nbsp;&nbsp;1.</span><span style="FONT-SIZE: 9pt;">双绞线用于视频基带传输，需要知道<span lang="EN-US">“</span>这是一种价格相对便宜，但传输特性很差的传输线<span lang="EN-US">”</span>；<span lang="EN-US">
                                <p></p></span></span></p><p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;&nbsp;&nbsp;&nbsp;2.</span><span style="FONT-SIZE: 9pt;">与同轴电缆比较，<chmetcnv wst="on" unitname="米" sourcevalue="430" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">430</span>米</chmetcnv>双绞线的传输衰减与频率失真和<chmetcnv wst="on" unitname="米" sourcevalue="1000" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">1000</span>米</chmetcnv><span lang="EN-US">75-5</span>电缆相当；<span lang="EN-US">
                                <p></p></span></span></p><p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;&nbsp;&nbsp;&nbsp;<chmetcnv wst="on" unitname="米" sourcevalue="3.1" hasspace="False" negative="False" numbertype="1" tcsc="0">3.1000<span lang="EN-US"><span lang="EN-US">米</span></span></chmetcnv><span lang="EN-US">双绞线高频与低频衰减差异为45.69-7.2db=38.49db,</span></span><span style="FONT-SIZE: 9pt;">这就是频率失真，而<chmetcnv wst="on" unitname="米" sourcevalue="1000" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">1000</span>米</chmetcnv><span lang="EN-US">75-5</span>电缆，频率失真为<span lang="EN-US">21.7-3.95=17.75db,</span>分贝数差<span lang="EN-US">2</span>倍多；电缆越长频率失真越大；这就是视频基带传输必须面对的严峻课题，也是应该如实向工程设计施工的朋友说清楚的问题；<span lang="EN-US">
                                <p></p></span></span></p><p align="center" style="TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 9pt;">&nbsp;&nbsp;&nbsp;&nbsp;4.</span><span style="FONT-SIZE: 9pt;">双绞线用于视频基带传输，传输设备需要具有更大的补偿衰减和频率失真的能力；或者说，相同补偿能力的传输设备，同轴传输具有远几倍的传输距离；所谓同轴电缆只适合<span lang="EN-US">3</span>、<chmetcnv wst="on" unitname="米" sourcevalue="500" hasspace="False" negative="False" numbertype="1" tcsc="1"><span lang="EN-US">5</span>百米</chmetcnv>内的近距离传输，<span lang="EN-US">1-2</span>公里最适合双绞线传输，完全是某些商家的虚假误导宣传。<span lang="EN-US">
                                <p></p></span></span></p><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: &quot;Times New Roman&quot;; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">&nbsp;&nbsp;&nbsp;&nbsp;5.</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">工程上，选择不同的传输方式时，这是应该考虑到的实际问题之一；</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: &quot;Times New Roman&quot;; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">&nbsp;</span>

怎么没得人顶哟

<p>非常专业,学习来了.</p><p></p>

好帖

想问问这数据是丛哪来的？

<p>不是在开玩笑吧！</p>

<div class="quote"><b>以下是引用<i>phoebe_1390</i>在2007-6-28 12:45:00的发言：</b><br/><p>你没经过大脑就问了这个问题 呵呵～</p></div><p>什么意思哟!!!说的不好也不要这样嘛伙计</p>

桂林金视顿实践上就用平行线来传视频，双绞线就更不用说了，支持楼主。

<p>顶一下~~楼主说得对~</p>

效果不错,用到现在都没有问题.

增长见识,请各位高手多指教.

<p>真的假的啊?摸不准!</p>

<p>恩&nbsp;&nbsp; 学习中 ！&nbsp; </p><p>会者不难， 难者不会 。&nbsp;&nbsp; </p><p>&nbsp;楼主&nbsp;！&nbsp; 我 撑 你&nbsp; ！</p>

<p>非常专业的数据参数啊</p><p>学习学习！</p>

<p>用1根网线，传了4路图象</p>

<p>可以的</p><p>不知道传输的图象是否清晰 有待考证</p>

<p>不错！现在双绞线用于视频传输以超强的抗干扰能力、低廉的成本、更方便的布线等特点，已慢慢取缔同轴传输，相信将成为趋势</p>