Administrator Guide

PoE or PoE+
Power Budget
Limit
Model Name Maximum PSU
Output Ability
(1 PSU)
Maximum PSUs
Output Ability
(2 PSUs)
System Power
Consumed
Redundancy
Power
Consumed
Threshold Max In-line
Power Available
default. Supports
up to two 1100 W
PSUs.
The following table shows the maximum number of ports that you can configure for PoE and PoE+ based on the number of PSUs
available on the C1048P.
NOTE: The table assumes maximum of 30 W for PoE+ and 15.4 W for PoE.
Table 74. Maximum Number of PoE and PoE+ Ports
Model Name Number of PSUs Maximum number of PoE+
Ports
Maximum Number of PoE
Ports
C1048P 1 28 48
C1048P 2 48 48
N2024P 1 24 24
N2024P 2 24 24
N2048P 1 48 28
N2048P 2 48 48
N3048P 1 48 31
N3048P 2 48 48
N3024P (1100 W) 1 24 24
N3024P (1100 W) 2 24 24
N3024P (715 W) 1 24 18
N3024P (715 W) 2 24 24
Enabling PoE or PoE+ on more ports than the power budget supports produces one of the following results:
• If the newly PoE or PoE+ -enabled port has a lower priority, the command is accepted but power is not allocated to the port. In this
case, the following message displays: %Warning: Insufficient power to enable. POE oper-status set to OFF
for port.
• If the newly PoE or PoE+ -enabled port has a higher priority, the command is accepted and power is terminated on the lowest priority
port in the power extender. If you add another PSU to the system later, both ports receive power.
• If all the lower priority ports combined cannot meet the power requirements of the newly enabled port, the command is accepted but
power on the lower priority ports is not terminated and power is not supplied to the port. The second result is true even if a powered
device is not connected to the port. You can allocate power to a port, thus subtracting it from the power budget and making it
unavailable to other ports, but that power is not consumed.
Displaying Power Allocated to Power Devices
To display PoE allocation to power devices by the port extender or port extender interface, use the following command.
For more information on PoE power allocation, see Allocating PoE Power on an Interface.
• Display PoE allocation on a port extender or port extender interface.
Exec and EXEC Privilege mode
show power inline {pe pe-id stack-unit unit-number | {interface interface}
• pe pe-id — Enter the keyword pe and the port extender ID. The range is from 0 to 25.
• stack-unit unit-number — Enter the keyword stack-unit and the stack unit number. The range is from 0 to 7.
730
Power over Ethernet (PoE)