ZyXEL Communications GS1350 Series User Manual page 106

Table 35 Basic Setting > PoE Setup (continued)
L ABEL DESC RIPT IO N
Power-Up Set how the Switch provides power to a connected PD at power-up.
– the Switch follows the IEEE 802.3af Power over Ethernet standard to supply power to the
802.3a f
connected PDs during power-up.
– the Switch can provide power to the connected PDs that require high inrush currents at
L e g a c y
power-up. Inrush current is the maximum, instantaneous input current drawn by the PD when first
turned on.
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).
– the Switch supports the IEEE 802.3at High Power over Ethernet standard and can supply
802.3a t
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.
Fo rc e - 802.3a t
hardware classification. Select this option if the connected PD does not comply with any PoE
standard and requests power higher than a standard power limit.
Pre - 802.3b t
this option if the connected PD was developed before the IEEE 802.3bt standard is implemented
but requires power between 33 W and 60 W.
– the Switch supports the IEEE 802.3bt standard and can supply power of up to 60 W per
802.3b t
Ethernet port to the connected PDs at power-up.
Max Power Specify the maximum amount of power the PD could use from the Switch on this port. If you leave
(mW) this field blank, the Switch refers to the standard or default maximum power for each class.
Note: The setting you enter here will NOT take effect when the power-up mode is set to
802.3b t
Wide Range Select this to let the Switch have a wider detection range for the PD.
Detection
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 to be
out of the standard range.
LLDP Power Via Select this to have the Switch negotiate PoE power with the PD connected to the port by
MDI transmitting LLDP Power Via MDI TLV frames. This helps the Switch allocate less power to the PD on
this port. The connected PD must be able to request PoE power through LLDP.
The Power Via MDI TLV allows PoE devices to advertise and discover the MDI power support
capabilities of the sending port on the remote device.
• Port Class
• MDI Supported
• MDI Enabled
• Pair Controllable
• PSE Power Pairs
• Power Class
Chapter 8 Basic Setting
– the Switch initially offers power on the port according to the IEEE 802.3af standard,
– the Switch offers power of up to 33 W on the port without performing PoE
– the Switch offers power on the port according to the IEEE 802.3bt standard. Select
.
GS1350 Series User's Guide
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