以太網(wǎng)供電（power over Ethernet）技術(shù)是目前新興的一項(xiàng)具有廣闊實(shí)用前景的技術(shù)。這項(xiàng)技術(shù)允許供電設(shè)備（power sourcingequipment）通過同一根以太網(wǎng)電纜在傳送數(shù)據(jù)的同時向具有電源接口（power interface）的網(wǎng)絡(luò)設(shè)備直接供電。本文基于該項(xiàng)技術(shù)的工業(yè)
標(biāo)準(zhǔn)（IEEE Std 802. 3af - 2003）介紹了以太網(wǎng)供電的設(shè)備、接入方法、工作機(jī)理以及相關(guān)參數(shù)。
關(guān)鍵詞POE（以太網(wǎng)供電） 802. 3af PSE（供電設(shè)備） PD（用電設(shè)備）
Abstract The POE（power over Ethernet）technology is an uprising star with bright future of practicability. This technology makes it possible that the PSE（power Sourcing Equipment）can supply power to the network equipment having PI（Power Interface）directly through the same Ethernet cable while transferring data. This article gives a detailed explanation about the Industrial Standard（IEEE Std 802. 3af - 2003）for this technology.
Keywords Power over Ethernet（POE） 802. 3af Power sourcing equipment（PSE） Powered device（PD）