D-Link DES-1526 - Manual (Page 57)

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System power Threshold: When the radio of the system power
supply is large than or smaller than the System power Threshold
setting, the Switch will send trap event to the Management
Station.
Note: When there is a system power shortage with the PD, the Switch
will enforce the PoE port priority management. The lower port
number will have the higher priority than the higher port number,
Port 1 > Port 2 > … > Port 24.
Device Status
Click on the “Status” button to display the device status on this
screen. It will display the System Status, Port Status, VLAN
Status, Trunk Status, Mirror Status, and PoE Status.
Press “Refresh” when you need to renew the posted information.