Port Management: PoE
Configuring PoE Settings
192 Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version)
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•Class Limit: Power is limited based on the class of the connected PD. For
these settings to be active, the system must be in PoE Class Limit mode. That
mode is configured in the PoE Properties page.
When the power consumed on the port exceeds the class limit, the port
power is turned off.
PoE priority example:
Given: A 48 port device is supplying a total of 375 watts.
The administrator configures all ports to allocate up to 30 watts. This results in 48
times 30 ports equaling 1440 watts, which is too much. The device cannot provide
enough power to each port, so it provides power according to the priority.
The administrator sets the priority for each port, allocating how much power it can
be given.
These priorities are entered in the PoE Settings page.
See Device Models for a description of the device models that support PoE and
the maximum power that can be allocated to PoE ports.
To configure PoE port settings:
STEP 1 Click Port Management > PoE > Settings.The list of fields below is for Port Limit
Power Mode. The fields are slightly different if the Power Mode is Class Limit.
STEP 2 Select a port and click Edit. The list of fields below is for Port Limit Power Mode.
The fields are slightly different if the Power Mode is Class Limit.
STEP 3 Enter the value for the following field:
•Interface—Select the port to configure.
•PoE Administrative Status—Enable or disable PoE on the port.
•Time Rang e—Select to enabled PoE on the port.
•Time Range Name—If Time Range has been enabled, select the time range
to be used. Time ranges are defined in the Time Range page.
•Power Priorit y Level—Select the port priority: low, high, or critical, for use
when the power supply is low. For example, if the power supply is running at
99% usage and port 1 is prioritized as high, but port 3 is prioritized as low,
port 1 receives power and port 3 might be denied power.