D-Link xStack DGS-3120-24TC, Руководство по эксплуатации продукта

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xStack® DGS-3120 Series Managed Switch Web UI Reference Guide
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Figure 2–9 PoE Port Settings window
The following parameters can be configured:
Parameter Description
Unit Select the unit you wish to configure.
From Port / To Port
Select a range of ports from the pull-down menus to be enabled or disabled for PoE.
State Use the pull-down menu to enable or disable ports for PoE.
Time Range
Select a range of the time to the port set as POE. If Time Range is configured, the power
can only be supplied during the specified period of time.
Priority Use the pull-down menu to select the priority of the PoE ports. Port priority determines
the 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 order 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.
Power Limit 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 – 0.44~15.4W
Class 1 – 0.44~4.0W
Class 2 – 4~7.0W
Class 3 – 7~15.4W
Class 4 – 15.4W
The following is the power limit applied to the port for these five 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;