Question: What is Power over Ethernet (PoE)?

Power over Ethernet (PoE) is the technology that you can use to transmit electrical power together with data to network devices over existing Ethernet cables, so you don’t need separate power supply to the PoE supported network devices.

PoE-capable devices can be power sourcing equipment (PSE), powered devices (PDs), or sometimes both. PSE device supplies power to those PD devices. Common PSE device is network switch and PDs are IP telephone, network camera, wireless access point, smart clock, LED lighting system, etc.

If you have non-PoE network switch, you can get a PoE injector to make it a PoE compliant switch (PSE) and provide power to other PoE devices (PDs). If you have non-PoE wireless access point (PDs), you can make use of PoE splitter for it to get power supply from PoE switch (PSE).

It’s convenient to implement PoE when there is no power supply near to the network device and also it would decrease the installation cost most of the time. You can find out more PoE information on this Power over Ethernet page.