PoE: What Is It and Why Do You Need It? Simple Explanation

What is PoE?

Power over Ethernet (PoE) transmits both electrical power and data over a single Ethernet cable. Instead of two wires (power + network), you need only one.

PoE Standards

PoE (802.3af): 15.4W — IP phones, basic cameras

PoE+ (802.3at): 30W — Wi-Fi access points, PTZ cameras

PoE++ (802.3bt): 60-90W — High-power APs, LED panels

How to Choose a PoE Switch?

The key parameter is PoE budget (total power for all ports). Always get a switch with 20-30% more capacity than calculated.

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