ZyXEL Communications xg3700 series User Manual page 78

Table 21 Basic Setting > PoE Setup > PoE Setup (continued)
LABEL DESCRIPTION
PD Priority This field is not available for the SFP or SFP+ ports.
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.
Select Critical to give the PD connected to this port the highest priority.
Select High to set the Switch to assign the remaining power to the port after all critical
priority ports are served.
Select Low to set the Switch to assign the remaining power to the port after all critical
and high priority ports are served.
Power-Up Set how the Switch provides power to a connected PD at power-up.
(Standalone mode)
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. Inrush current is the maximum, instantaneous input current
drawn by the PD when first turned on.
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.
Max Power (mW) Set the maximum amount of power (from 1000 to 33000) the PD could use from the
Switch on this port. Otherwise, leave the field blank to allow the connected PD to use
power up to 33W in Consumption mode and 30W in Classification mode.
Time Range Select a pre-defined schedule (created using the Advanced Application > Time
(Standalone mode) Range screen) to control when the Switch enables PoE to provide power on the port.
If you leave this field blank, PoE is disabled on the port.
Apply Click Apply to save your changes to the Switch's run-time memory. The Switch loses
these changes if it is turned off or loses power, so use the Save link on the top
navigation panel to save your changes to the nonvolatile memory when you are done
configuring.
Cancel Click Cancel to begin configuring this screen afresh.
Note: If the priority settings for two or more PoE ports are the same and the power
budget is not enough, the ports will shut down randomly. We strongly recommend
you set the priority for each PoE port to make sure the high priority ports get
power.
Chapter 6 Basic Setting
GS3700/XGS3700 Series User's Guide
78