ZyXEL Communications GS1900 Series, Руководство пользователя

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Chapter 19 Configuration: Port
GS1900 Series User’s Guide
123
Power-Up Set how the Switch provides power to a connected PD at power-up.
802.3a f
– the Switch follows the IEEE 802.3af Power over Ethernet standard to supply power to
the connected PDs during power-up.
Le g a c y
– the Switch can provide power to the connected PDs that require high inrush currents
at power-up.
Pre - 802.3a t
– 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).
802.3a t
– 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.
Wide Range
Detection This field is available on the GS1900-8HP (Revision B1) and GS1900-10HP only.
Select whether to enable 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
Ena b le
if the Switch applies a wider range for PD
detection. Otherwise, it displays
Disa b le
.
Max Power Type Select
C la ssific a tio n- b a se d
to have the Switch automatically decide the maximum amount of
power it can provide on the port according to the connected PD’s power classification.
Select
Use r- de fine d
to manually specify the maximum amount of power the PD could use from
the Switch on this port.
Max Power
Threshold Specify the maximum amount of power the Switch can provide on the port if you set
Ma x
Po we r Type
to
Use r- de fine d
.
Enter a value between 1000 and 33000 in increments of 200.
Time Range Select a pre-defined schedule (created using the
Tim e Ra ng e
screen) to control when the
Switch enables PoE to provide power on the port.
If you leave this field blank, there is no schedule applied to the port.
Apply Click
Apply
to save the changes.
Cancel Click
C a nc e l
to discard the changes.
Table 68 Configuration > Port > PoE > Port > Edit (continued)
LABEL DESC RIPTIO N