xStack® DGS-3120 Series Layer 3 Managed Gigabit Ethernet Switch Web UI Reference Guide
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The Switch includes the following PoE features:
1. Auto-discovery recognizes the connection of a PD (Powered Device) and automatically sends power to
it.
2. The Auto-disable feature occur under two conditions: firstly, if the total power consumption exceeds the
system power limit; and secondly, if the per port power consumption exceeds the per port power limit.
3. Active circuit protection automatically disables the port if there is a short. Other ports will remain active.
Based on 802.3af/at PDs receive power according to the following classification: PSE provides power according to the following classification:
Class Maximum power available to PD Class Max power used by PSE
0 12.95W
0 15.4W
1 3.84W
1 4W
2 6.49W
2 7W
3 12.95W
3 15.4W
4 29.5W
User define 35W
To configure the PoE features on the Switch, click System Configuration > PoE. The PoE System Settings
window is used to assign a power limit and power disconnect method for the whole PoE system. To configure the
Power Limit for the PoE system, enter a value between 37 and 760 Watts for the Switch in the Power Limit field.
When the total consumed power exceeds the power limit, the PoE controller (located in the PSE) disconnects the
power to prevent overloading the power supply.
NOTE: When the stacking function is enabled, non-PoE switches in the DGS-3120 series will have
PoE commands available.
PoE System Settings
To view the following window, click System Configuration > PoE > PoE System Settings, as shown below:
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