Power over Ethernet (PoE)
FAQs
Power over Ethernet (PoE) is a technology that allows data and electrical power to be transmitted over a single Ethernet cable.
This means devices such as IP cameras, wireless access points, and VoIP phones can be powered directly through the network cable, eliminating the need for separate power outlets.
PoE is based on IEEE standards:
- 802.3af (PoE) - up to 15.4W per port
- 802.3at (PoE+) - up to 30W per port
- 802.3bt (PoE++/Hi-PoE) - up to 60-90W per port
PoE simplifies installation, reduces cable clutter, and provides a reliable power source for connected devices.
PoE Injectors adds power to a non PoE network line, allowing you to power PoE enabled devices using a standard Ethernet switch or router. Ideal when your existing network switch doesn’t support PoE.
PoE Extenders extend both data and power beyond the 100 metre Ethernet limit, enabling you to install devices further away (up to 200-300 metres, depending on the model).
In short, injectors add power to a network connection, while extenders increase distance and maintain PoE functionality.
When selecting PoE products, consider:
- Power requirements, check the wattage your device needs (e.g., IP cameras often need PoE+, while PTZ cameras or access points may need PoE++).
- Network speed, match your injector or extender to your network (Fast Ethernet, Gigabit, or 10G).
- Number of ports, choose between single port injectors for individual devices or multi port injectors for multiple endpoints.
- Distance, use PoE extenders if your devices are more than 100 metres from the power source.
- Installation environment, industrial rated PoE injectors and extenders are available for harsh or outdoor conditions with wide temperature tolerance and rugged housings.
Benefits include:
- Simplified installation, power and data through one cable reduce the need for extra wiring.
- Cost effective, eliminates the need for electrical outlets near devices.
- Flexibility, easy to deploy or reposition devices anywhere a network cable can reach.
- Scalability, add more devices to existing networks without major electrical work.
- Reliability, centralised power makes it easier to integrate UPS backup systems for network resilience.