D-Link DGS-3120-48PC-SI Product Manual - Page 20

xStack® DGS-3120 Series Managed Switch Web UI Reference Guide Figure 2-9 PoE Port Settings window The following parameters can be configured: Parameter Description Unit From Port / To Port State Time Range Priority Power Limit Select the unit you wish to configure. Select a range of ports from the pull-down menus to be enabled or disabled for PoE. Use the pull-down menu to enable or disable ports for PoE. 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. 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. 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; 12