D-Link xStack User Manual page 92

xStack
Power Limit
Click Apply to implement changes made. The port status of all PoE configured ports is displayed in the PoE Port Table.
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DGS-3400 Series Layer 2 Gigabit Ethernet Managed Switch
priority which the system attempts to supply the power to the ports. There are three levels of
priority that can be selected, Critical, High, and Low. When multiple ports happen to have the
same level of priority, the port ID will be used to determine the priority. The lower port ID has
higher priority. The setting of priority will affect the ordering of supplying power. Whether the
disconnect method is set to deny low priority port, the priority of each port will be used by the
system to manage the supply of power to ports.
This function is used to configure the per-port power limit. If a port exceeds its power limit, it
will shut down.
Based on 802.3af/802.3at, there are different PD classes and power consumption ranges;
Class 0 – 0.44~12.95W
Class 1 – 0.44~3.84W
Class 2 – 3.84~6.49W
Class 3 – 6.49~12.95W
The following is the power limit applied to the port for these four classes. For each class, the
power limit is a little more than the power consumption range for that class. This takes into
account any power loss on the cable. Thus, the following are the typical values;
Class 0 : 15400mW
Class 1 : 4000mW
Class 2 : 7000mW
Class 3 : 15400mW
User define: 16800mW
As well as these four pre-defined settings, users can directly specify any value ranging from
1000mW to 16800mW.
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