Users Guide

Switch Feature Overview 81
Power is supplied to the device in class mode per the following table:
In four-pair mode, twice the power listed in the table above is delivered. For
information about the available system power, see the Hardware Overview
chapter.
Power Management in Guard Band
The Dell EMC Networking N1100P-ON, N1500P, N2000P, N2100-ON,
N3000P, and N3100-ON Series switches support a dynamic guard band, which
means that the guard band used varies depending upon the following factors:
• Power management mode
• Class of the device being powered up.
Prior to a device being powered up, the switch calculates the following:
[(switch power capacity – guard band) – (current power consumption +
computed power draw of the new device)]
If this value is less than zero (which means powering up the new PD device
will put the total power draw into the guard band or above the switch power
capacity), then the switch does not power up the new device.
The power management mode is configured using the power inline
management command. The guard band for a Class 0 or Class 4 device may
be configured with the power inline usage-threshold command. The user-
defined power limit can be found with the show power inline detailed
command. The power limit is used as a guard band when powering up a port.
If the remaining available power is less than the guard band, the device is not
powered up. By default, the guard band is 32 watts.
Class Usage AF Device (Watts) AT Device (Watts)
0 Default 16.4 33
1 Optional 16.4 33
2Optional 5 33
3Optional 8 33
4 Optional 16.4 33