Chapter 19 Configuration: Port
GS1900 Series User’s Guide
106
Figure 98 Configuration > Port > PoE > Port
The following table describes the labels in this screen.
Table 65 Configuration > Port > PoE > Port
LABEL DESCRIPTION
Edit Select one or more ports in the first column of the table and click this to configure PoE
settings for the ports.
Port Displays the port index number.
State Displays which ports can receive power from the Switch. You can set this in the
Configuration > Port > PoE Edit screen.
• Disable - The powered device (PD) connected to this port cannot get power.
• Enable - The PD connected to this port can receive power.
Class This shows the power classification of the PD.
This is a number from 0 to 4, where each value represents a range of power (W) and
current (mA) that the PD requires to function. The ranges are as follows.
• Class 0 - Default, 0.44 to 12.94
• Class 1 - Optional, 0.44 to 3.84
• Class 2 - Optional, 3.84 to 6.49
• Class 3 - Optional, 6.49 to 12.95
• Class 4 - Reserved (PSEs classify as Class 0) in a switch that supports IEEE 802.3af only. Optional, 12.95 to
25.50 in a switch that supports IEEE 802.3at.
PD Priority When the total power requested by the PDs exceeds the total PoE power budget on the
Switch, you can set the PD priority to allow the Switch to provide power to ports with higher
priority first.
• Critical has the highest priority.
• High has the Switch assign power to the port after all critical priority ports are served.
• Low has the Switch assign power to the port after all critical and high priority ports are served
Power-Up This shows how the Switch provides power to the connected PD at power-up.
802.3af - the Switch follows the IEEE 802.3af Power over Ethernet standard to supply
power to the connected PDs during power-up.
Legacy - the Switch can provide power to the connected PDs that require high inrush
currents at power-up.
Pre-802.3at - the Switch initially offers power on the port according to the IEEE 802.3af
standard, and then switches to support the IEEE 802.3at standard within 75 milliseconds
after a PD is connected to the port. Select this option if the Switch is performing 2-event
Layer-1 classification (PoE+ hardware classification) or the connected PD is NOT performing
Layer 2 power classification using Link Layer Discovery Protocol (LLDP).
802.3at - the Switch supports the IEEE 802.3at High Power over Ethernet standard and
can supply power of up to 30W per Ethernet port. IEEE 802.3at is also known as PoE+ or
PoE Plus. An IEEE 802.3at compatible device is referred to as Type 2. Power Class 4 (High
Power) can only be used by Type 2 devices. If the connected PD requires a Class 4 current
when it is turned on, it will be powered up in this mode.
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