Cisco Systems SG30052PK9NA Manual De Usuario

Configuring PoE Properties

179

Cisco Small Business 300 Series Managed Switch Administration Guide 

may not be able to properly supply power to its attaching PDs. 

To prevent false detection, you should disable PoE on the ports on the PoE switches 
that are used to connect to PSEs.   You should also first power up a PSE device 
before connecting it to a PoE device. When a device is being falsely detected as a 
PD, you should disconnect the device from the PoE port and power recycle the 
device with AC power before reconnecting its PoE ports.

The PoE Properties page

 

enables selecting either the Port Limit or Class Limit PoE 

mode and specifying the PoE traps to be generated. 

These settings are entered in advance. When the PD actually connects and is 
consuming power, it might consume much less than the maximum power allowed. 

Output power is disabled during power-on reboot, initialization, and system 
configuration to ensure that PDs are not damaged. 

To configure PoE on the device and monitor current power usage:

Click Port Management > PoE > Properties.

Enter the values for the following fields:

•

Power Mode—Select one of the following options:

-

Port Limit

—The maximum power limit per each port is configured by the 

user.

-

Class Limit

—The maximum power limit per port is determined by the 

class of the device, which results from the Classification stage. 

When you change from Port Limit to Class Limit or vice versa, you 

must disable PoE ports, and enable them after changing the power 
configuration.

•

Traps—Enable or disable traps. If traps are enabled, you must also enable 
SNMP and configure at least one SNMP Notification Recipient.

•

Power Trap Threshold—Enter the usage threshold that is a percentage of 
the power limit. An alarm is initiated if the power exceeds this value.