以太网供电适应更高的要求

　　以太网供电适应更高的要求

　　作为一个足智多谋的物种，工程师们花了很长时间才意识到，在安全设备等远程设备上运行两组电缆——一个用于通信，另一组用于供电——既昂贵又单调。幸运的是，5类电缆（及以上）用于以太网网络可以承载一些几十瓦很长的电缆，它是完美的做工作。因此以太网上的电源概念诞生了。

　　本文概述了POE及其优点，并介绍了PoE +，这项技术的发展使布线能够承载更高的负载。然后文章从主要供应商中寻找专门的部件，以简化建立POE系统的工作。

　　The advantages of PoE

　　Perhaps the biggest benefit of PoE is its simplicity. Once it is installed for communication， standard Ethernet cable can be used for power as well. That saves on materials， labor， installation time， and ongoing maintenance costs. There is a need for PoE-compliant switches and power supplies， of course， but a range of vendors offer ready-to-fit products that are simple to install.

　　The centralized and flexible nature of PoE eliminates the need for each powered device on the network to have its own local power supply. That allows the devices to be placed anywhere and easily relocated later if required.