What is PoE?
PoE is a technology that enables the simultaneous transmission of both power and data over a single Ethernet cable. It simplifies the installation of devices that require both network connectivity and electrical power, eliminating the need for separate power lines.
How does PoE work?
A PoE switch or PoE injector supplies electrical power into the Ethernet cable along with the data signal. The connected device—such as an access point or IP camera—has a built-in PoE receiver that separates and uses the power for operation.
Common PoE Standards:
- IEEE 802.3af (PoE): Up to 15.4 W
- IEEE 802.3at (PoE+): Up to 30 W
- IEEE 802.3bt (PoE++): 60–100 W depending on class
Typical Use Cases:
- WiFi access points in office or industrial environments
- IP cameras in security systems
- VoIP phones in modern office networks
- IoT sensors in building automation and monitoring
PoE makes it possible to place network devices in locations without nearby power outlets and allows centralized remote management and rebooting of devices when needed.