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<b><a href="http://www.horuo.com/" target="_blank" style="font-weight:bold">成都|络U?/a></b>厂家介绍双绞U传输视频图像的优点及在安防pȝ中的应用 </p> <p style="text-indent:2em;"> 安防pȝ是现代智能徏{中最基础的弱늳l之一Q在传统的设计和施工中,往往网l布U与安防监控布线分开考虑Q这是由于用的介质差异使h们无法将它们很好地统一C赗但是在大厦的安防监控点不断增加的情况下Q较为粗的同u늼布线数量增多会占用大量的道资源Q而且布线隑ֺ很大Q况且在布线的长度过大时q会引v囑փ质量的下降?br /> 随着距离的g伸,传统布线中的主角----同u늼来不能满x工和应用的需求。成?a href="http://www.horuo.com/tcllglcp/wlx/" target="_blank">|络U?/a>厂家新的布线技术的出发点就是将|络布线与安防布U尽量统一C个^CQ减布U的隑ֺ和造h。在q种布线技术中采用|络布线中广泛用的非屏蔽电~??cȝ)来传输图像信P同时利用非屏蔽电~中的空余线对ؓ是摄像机供电。ؓ实现q种技术需要用两U关键的讑֤Q双l线视频传输讑֤和远E供电器?br /> 一、双l线传输视频信号的基本原?br /> 视频信号要在双绞U内传输要解决两个问题:L匚w和衰减补ѝ?br /> 标准视频信号接口一般是75Ω、非q方式Q而双l线传输时是100Ω、^衡方式,q样用双l线传输视频信号p设法解决75Ω←→100Ω以及非^衡←→^衡的转换问题。有两种Ҏ可以完成q种转换Q一U是采用传输变压器的无源方式Q它无须供电Q但是会对信h一定损失,驱动能力有限;另外一U是采用有源方式Q通过宽带攑֤器和专用芯片Q不仅可以完成阻抗和q方式的{换,而且可以提供较强的驱动和对图像信L攑֤补偿Q缺Ҏ需要供甉|能工作?a href="http://www.horuo.com/supply/24.html" target="_blank">成都|络U厂?/a><br /> 另外Q视频信h一U高频宽带信P带宽辑ֈ6MHzQ如果直接在双绞U内传输Q信Lq度会受到较大的衰减Q在监视器上表现为图像的色彩变E以及亮度变暗。因此,视频信号在双l线上要传输较远距离必须q行攑֤和补偿,以保证图像质量?br /> 二、双l线与双l线传输囑փ的优?br /> 1、双l线?br /> 双绞U(Twisted Pair wireQ是l合布线工程中最常用的一U传输介质,׃根具有绝~保护层的铜导线l成。把两根l缘的铜导线按一定密度互相绞在一P可降低信号干扰的E度Q每一根导U在传输中辐的甉|L会被另一根线上发出的甉|L抉|。与其他传输介质相比Q双l线在传输距R信道宽度和数据传输速度{方面均受到一定限Ӟ但hDZ廉?br /> 双绞U可以分为屏蔽双l线(STP)与非屏蔽双绞U?UTP)两大cR成都网l线厂家<br /> 另外双绞U又分别?cR?cR?cR超5cȝ?cȝ多种?cdl线的速率?0Mb/SQ?cdl线的速率可达100Mb/SQ超5cL可达155Mb/s以上Q只能有五类或超五类才能?00Base-TX。屏蔽双l线因ؓ늼的外层有一层铝泊包裹用以减辐,制作比较ȝQ再加上L较非屏蔽双绞U贵Q所以我们在10Base-T?00Base-TX|络中常用的是非屏蔽5cd?cdl线?br /> 2、双l线传输囑փ的优?br /> 双绞U在很多工业控制需要中和干扰较大的场所以及q距M输中都有使用Q应用广泛的局域网也是使用了双l线对,它具有抗q扰能力强、传输距远、布U容易、节省空间、hg廉等{优炏V目前通过采用先进的技术和专用芯片Q已l能够在双绞U上传输高质量的囑փ信号。成都网l线厂家<br />         ① 布线方便Q线~利用率?br /> 建筑内广泛铺讄非屏蔽双l线d一对就可以传送一路视频信P׃一?cȝ内有4个双l线对,因此可以传输4路视频图像,q对于监控点多、需要密集布U的建筑来说Q无疑大大减M布线施工的难度。另?对双l线中的1对传送视频信P其余的还可以传输音频信号、控制信受电源等Q提供了늼的利用率Q避免了各种信号单独布线带来的麻烦,减少了工E造hQ克服了同u늼布线困难、占用管道资源多的缺点,使综合布U的U类更趋l一化?br />         ② 抗干扰能力强<br /> 双绞U能有效地抑制共模干扎ͼ即在强q扰环境下,双绞U也能传送极好的囑փ信号。例如楼宇的甉|、设备房{处都会存在很强的干扎ͼ处于闹市区的建筑物也会受到来自周围环境的各种q扰Q双l线的强抗干扰能力比同u늼既有更大的优ѝ?br />         ③ 可靠性高、用方?br /> 利用双绞U传输视频信P在前端要接入专用发射机,在控制中心要接入专用接收机。这U双l线传输讑֤h便宜Q用简单,工作E_。成都网l线厂家<br />         ④ M造h降低<br /> ?c非屏蔽늼在目前的楼宇l合布线中被q泛使用Q其h比同轴电~要低,随着?cȝ在通信中的大量应用QhD会进一步下降,因此使用双绞U的l济性和便利性更为突出?br />         ⑤ 实时传输Q即时监?br /> 双绞U传送的囑փ信号采用的是模拟信号技术,保证了监控系l的实时性,在控制室可以实时监控现场的图像。成都网l线厂家<br /> 针对监控pȝ现时的需求,l合l合布线pȝ发展的趋势,许多l合布线产品生厂家Q例如VCOMQ唯Pl合布线{系列品生产依托自w强大的技术优势,开发了一pd适合用于监控pȝ的品来q接监控pȝ双绞U时代的到来Q相信在不久的将来综合布U系l将不再只服务于传统的语韛_数据|络pȝQ它越来越占据qpȝ中传输媒介的重要位置?</p></div> </div> <div class="tag">相关标签Q?a href='/key.aspx?k=%e7%a7%8b%e5%8f%b6%e5%8e%9f%e4%ba%a7%e5%93%81'>U叶原?/a>,<a href='/key.aspx?k=%e6%88%90%e9%83%bd%e7%bd%91%e7%bb%9c%e7%ba%bf%e5%8e%82%e5%ae%b6%e4%bb%b7%e6%a0%bc'>成都|络U厂家h?/a>,<a href='/key.aspx?k=%e6%88%90%e9%83%bd%e7%bd%91%e7%bb%9c%e7%ba%bf%e5%8e%82%e5%ae%b6%e6%89%b9%e5%8f%91'>成都|络U厂家批?/a>,</div> <ul class="prev_next clearfix"> <li>上一:<a 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