What is PoE – PoE (Power over Ethernet) is a networking feature defined by the IEEE 802.3af and 802.3at standards. PoE lets Ethernet cables supply power to network devices over the existing data connection.
PoE-capable devices can be power sourcing equipment (PSE), powered devices (PDs), or sometimes both. The device that transmits power is a PSE and Powers PD . Most PSEs are either network switches or PoE injectors intended for use with non-PoE switches. Common examples of PDs include VoIP phones, wireless access points, and IP cameras.
PoE+, the update to PoE, is the IEEE 802.3at standard. The major difference between 802.3af (PoE) and 802.3at (PoE+) is that PoE+ PSEs can provide almost twice as much power over a single Ethernet cable.
PoE+ PSEs can supply power to both PoE and PoE+ PDs, but PoE PSEs can only supply power to PoE PDs. PoE+ PDs require more power than PoE PSEs can provide.
In order to understand in more detail about PoE and PoE +, then we will use this comparison, PoE, PoE Plus/PoE+ Comparison :
Because homes typically have many power outlets and relatively few Ethernet wall jacks, and many consumer gadgets use Wi-Fi connections instead of Ethernet, the applications of PoE for home networking are limited. Network vendors typically only include PoE support on their high-end and business-class routers and network switches for this reason.
Many consumers can add PoE support to an Ethernet connection using a relatively small and cheap device called a PoE injector. These devices feature Ethernet ports (and a power adapter) that enable standard Ethernet cables with power.