ZyXEL Communications GS1900 Series User Manual page 121

Table 67 Configuration > Port > PoE > Port (continued)
L ABEL DESC RIPT IO N
Class This shows the power classification of the PD. Each PD has a specified maximum power that fall
under one of the classes.
The Class is a number from 0 to 4, where each value represents the range of power that the
Switch provides to the PD. The power ranges for each class are as follows.
•
C la ss 0
•
C la ss 1
•
C la ss 2
•
C la ss 3
•
C la ss 4
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.
•
C ritic a l
•
Hig h
•
Me dium
served.
•
L o w
are served.
Power-Up This shows how the Switch provides power to the connected PD at power-up.
802.3a f
the connected PDs during power-up.
L e g a c y
at power-up.
Pre - 802.3a t
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).
802.3a t
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.
Wide Range This field is available on GS1900-8HP (Revision B1) and GS1900-10HP only.
Detection
This shows whether the Switch enables a wider detection range for the PD or not.
The Switch detects whether a connected device is a powered device or not before supplying
power to the port. For the PD detection, the Switch applies a fixed voltage to the device and
then receives returned current. If the returned current is within the IEEE 802.3AF/AT standard
range, the device will be considered as a valid PD by the Switch.
However, in real cases, environmental interferences might easily cause the returned current out
of the standard range. This field displays
detection. Otherwise, it displays
Consuming This field displays the current amount of power consumed by the PD from the Switch on this port.
Power (mW)
Max Power (mW) This field displays the maximum amount of power the PD could use from the Switch on this port.
Time Range
Chapter 19 Configuration: Port
– Default, 0.44 to 12.94
– Optional, 0.44 to 3.84
– Optional, 3.84 to 6.49
– Optional, 6.49 to 12.95
– Reserved (PSEs classify as Class 0) in a switch that supports IEEE 802.3af only.
has the highest priority.
has the Switch assign power to the port after all critical priority ports are served.
has the Switch assign power to the port after all critical and high priority ports are
has the Switch assign power to the port after all critical, high and medium priority ports
– the Switch follows the IEEE 802.3af Power over Ethernet standard to supply power to
– the Switch can provide power to the connected PDs that require high inrush currents
– the Switch initially offers power on the port according to the IEEE 802.3af standard,
– the Switch supports the IEEE 802.3at High Power over Ethernet standard and can
Disa b le
GS1900 Series User's Guide
121
if the Switch applies a wider range for PD
Ena b le
.