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PoE Class Detection
Powered devices can be classified into different classes as shown in the table below. Class detection
allows for automatic maximum power adjustment based on the power class detected. This will prevent
the switch from delivering more than the maximum power allowed based on a device’s class.
During class detection, the switch will allocate the maximum amount of power allowed based on the
class detected. Once powered, if the device uses less than the maximum, the remaining power will be
made available for other devices.
Although class-detection is disabled by default, the PoE module still provides power to incoming PDs (if
available in the power budget). However, to strictly enforce class detection as specified in the 802.3at
standard, class detection must be enabled using the lanpower slot class-detection command.
Enabling class detection will reset all PoE ports.
Class Usage
Classification
Current (mA) Power Range
(Watts)
Class Description
0 Default 0-4 0.44-30.00 Unimplemented
1 Optional 9-12 0.44-3.84 Very Low Power
2 Optional 17-20 3.84-6.49 Low Power
3 Optional 26-30 6.49-12.95 Mid Power
4 Optional 36-44 12.95-30.00 High Power
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