Users Guide

Switch Feature Overview 85
The power management mode is configured using the power inline
management command. The guard band is calculated by the switch as shown
below. The user- defined threshold power limit can be found with the show
power inline detailed command, and is configured with the power inline
usage-threshold command. Threshold Power is reduced by the guard band
when powering up a port.
If the remaining available power (threshold power - guard band - current
power consumption) is less than the computed power draw of the new device,
the device is not powered up.
Ports may have a PoE priority assigned. If a device is plugged into a higher
priority port, lower priority ports will be de-powered to power the higher
priority port. Among ports with the same priority, lower numbered ports have
priority over higher numbered ports.
Regardless of the power management mode, the guard band is configured
according to the device class.
Dynamic or Static Power Management Mode Guard Band
In these modes, the guard band for the port being powered up is 32 watts.
Class-Based Power Management Mode Guard Band
In this mode, the dynamic guard band for the port being powered up is:
• For Class 0 device: 16.4 watts
• For Class 1 device: 5 watts
• For Class 2 device: 8 watts
• For Class 3 device: 16.4 watts
• For Class 4 device: 32 watts
• For Class 5 device: 47.5 watts.
• For Class 6 device: 63 watts.