以太網(wǎng)供電適應(yīng)更高的要求

　　作為一個(gè)足智多謀的物種，工程師們花了很長(zhǎng)時(shí)間才意識(shí)到，在安全設(shè)備等遠(yuǎn)程設(shè)備上運(yùn)行兩組電纜——一個(gè)用于通信，另一組用于供電——既昂貴又單調(diào)。幸運(yùn)的是，5類(lèi)電纜（及以上）用于以太網(wǎng)網(wǎng)絡(luò)可以承載一些幾十瓦很長(zhǎng)的電纜，它是完美的做工作。因此以太網(wǎng)上的電源概念誕生了。

　　本文概述了POE及其優(yōu)點(diǎn)，并介紹了PoE +，這項(xiàng)技術(shù)的發(fā)展使布線(xiàn)能夠承載更高的負(fù)載。然后文章從主要供應(yīng)商中尋找專(zhuān)門(mén)的部件，以簡(jiǎn)化建立POE系統(tǒng)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.