Power over Ethernet (PoE) is a technology that allows network cables to carry electrical power, in addition to data. This means that devices such as wireless access points, IP cameras, and VoIP phones can receive both data and power over a single Ethernet cable, which can simplify installation and reduce the need for additional electrical outlets.
PoE is typically implemented using a PoE-enabled switch, which can provide power to PoE-enabled devices through the Ethernet cable. The switch detects whether a connected device is PoE-enabled and provides the appropriate amount of power.
There are different types of PoE, which vary in terms of the amount of power that can be delivered over the Ethernet cable. The most common standard is 802.3af, which can deliver up to 15.4 watts of power. The newer 802.3at standard, also known as PoE+, can deliver up to 30 watts of power. There are also proprietary PoE standards, such as Ubiquiti’s 24V passive PoE, which can deliver up to 24 watts of power.
PoE can be particularly useful in situations where it may be difficult or expensive to run electrical power to devices. For example, in a large office building with many wireless access points, it may be impractical to run electrical power to each access point. PoE allows the access points to be powered over the Ethernet cable, which can simplify installation and reduce costs.
Overall, PoE is a useful technology that can simplify the installation and management of network devices, particularly in situations where power may be difficult to access.