PoE Availability and Modes

When working with your network devices, it's important to understand each device's power requirements and the types of Power over Ethernet (PoE) they support. This guide provides insights into PoE modes, power consumption, and device compatibility.

PoE Modes

Feature PoE PoE+ PoE++ (Type 3) PoE++ (Type 4)
IEEE Standard IEEE 802.3af IEEE 802.3at IEEE 802.3bt IEEE 802.3bt
PoE Type Type 1 Type 2 Type 3 Type 4
Max. Power Per Port 15.4W 30W 60W 100W
Port Voltage Range 44–57V 50-57V 50-57V 52-57V
Max. Power to Device 12.95W 25.5W 51W 71W
Voltage Range to Device 37-57V 42.5-57V 42.5-57V 41.1-57V
Twisted Pairs Used 2-pair 2-pair 4-pair 4-pair
Supported Cables Cat3 or better Cat5 or better Cat5 or better Cat5 or better



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PoE checkmark.svg checkmark.svg checkmark.svg checkmark.svg checkmark.svg
PoE+ checkmark.svg checkmark.svg checkmark.svg checkmark.svg checkmark.svg
PoE++ x.svg checkmark.svg checkmark.svg x.svg x.svg

Refer to model-specific datasheets at Tech Specs for more detailed information.


PoE Availability and Power Requirements

PoE Availability is a switch's total power, in Watts, that it can distribute among all connected clients. Your PoE Availability must be greater than the sum of all device power requirements to prevent instability or failure.


Note: Please refer to model-specific datasheets found on the UI Store for more detailed information.

PoE Adapters

A PoE Adapter can be used as an alternative power source if you do not have a PoE switch. It can also be used to offload connected devices after you’ve exceeded your switch’s PoE Availability. 


Further Resources

For detailed technical specifications and device comparisons, visit techspecs.ui.com.

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