xStack® DGS-3620 Series Managed Switch Web UI Reference Guide
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The Switch includes the following PoE features:
• Auto-discovery recognizes the connection of a PD (Powered Device) and automatically sends power to it.
• The Auto-disable feature occurs 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.
• 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:
Class Maximum power available to PD
0 12.95W
1 3.84W
2 6.49W
3 12.95W
4 29.5W
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 1W and 370W 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.
PoE System Settings
To view the following window, click System Configuration > PoE > PoE System Settings, as show below:
Figure 2-8 PoE System Settings window
The following parameters can be configured:
Parameter Description
Select the unit you wish to configure. Tick the All check box to select all units.
Power Limit (37-
740)
Sets the limit of power to be used from the Switch’s power source to PoE ports. The user
may configure a Power Limit between 1 and 740W for the DGS-3620-28PC and DGS-
3620-52P. The default setting is 740W.
Power Disconnect
Method
The PoE controller uses either Deny Next Port or Deny Low Priority Port to offset the
power limit being exceeded and keeps the Switch’s power at a usable level. Use the drop
down menu to select a Power Disconnect Method. The default Power Disconnect
Method is Deny Next Port. Both Power Disconnection Methods are described below:
Deny Next Port – After the power limit has been exceeded, the next port attempting to
power up is denied, regardless of its priority. If Power Disconnection Method is set to
Deny Next Port, the system cannot utilize out of its maximum power capacity. The
maximum unused watt is 19W.
Deny Low Priority Port – After the power limit has been exceeded, the next port
attempting to power up causes the port with the lowest priority to shut down so as to
allow the high-priority and critical priority ports to power up.
Use the drop-down menu to enable or disable detecting legacy PDs signal.
Click Apply to implement changes made.
PSE provides power according to the following classification:
Class Max power used by PSE
0 16.2W
1 4.2W
2 7.4W
3 16.2W
User define
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