Power over Ethernet (PoE) is a technology that allows both data and electrical power to be delivered through a single Ethernet cable. It eliminates the need for separate power adapters, simplifying network installations.
Example: Used in IP cameras, Wi-Fi access points, VoIP phones, and IoT devices.
How Does PoE Work?
- A PoE switch or injector supplies power through the Ethernet cable.
- The powered device (PD), such as an IP camera, receives power and network data.
- This allows devices to operate without needing a separate power outlet.
PoE Components
- Power Sourcing Equipment (PSE): Provides power (e.g., PoE switch, PoE injector).
- Powered Device (PD): Receives power (e.g., IP cameras, VoIP phones).
Types of PoE Standards
|
|---|
Advantages of PoE
- Saves Costs – No need for separate power cables or outlets.
- Flexible Installation – Ideal for places where power outlets are unavailable.
- Reliable – Centralized power management ensures stable operation.
- Scalable – Easily expands networks by adding PoE-powered devices.
Disadvantages of PoE
- Limited Power Output – Not suitable for high-power devices like laptops.
- Distance Restriction – Maximum 100 meters (can be extended with repeaters).
- Equipment Compatibility – Requires PoE-enabled switches or injectors.
Common PoE Applications
- IP Cameras – Power security cameras over Ethernet cables.
- Wi-Fi Access Points – Power APs in areas without electrical outlets.
- VoIP Phones – Reduce cable clutter in offices.
- IoT Devices & Sensors – Power smart devices efficiently.