PoE Classes and Power Ratings

A powered device is classified based on the maximum power that it draws across all input voltages and operational modes. When Class-based power management mode is configured on the SRX series devices, power is allocated taking into account the maximum power ratings defined for the different classes of devices.

Table 241 lists the classes and their power ratings as specified by the IEEE standards.

Table 241: SRX Series Devices PoE Specifications

Class	Usage	Minimum Power Levels Output from PoE Port
0	Default	15.4 watts
1	Optional	4.0 watts
2	Optional	7.0 watts
3	Optional	15.4 watts
4	Reserved	Class 4 PDs are eligible for receiving power up to 30 watts according to IEEE standards.