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The port priority determines which ports can still deliver power after the total power
delivered by the switch exceeds the total power budget. (In such a situation, the
switch might not be able to deliver power to all connected devices.) If the same
priority applies to two ports, the lower-numbered port receives higher priority.
10.
From the Power Mode menu, select the PoE mode in which the port must function:
•
802.3af: The port is powered in and limited to the IEEE 802.3af mode. A PD that
requires IEEE 802.3at does not receive power if the port functions in IEEE 802.3af
mode.
•
Legacy: The port is powered using high-inrush current, which is used by legacy
PDs that require more than 15W to power up.
•
Pre-802.3at: The port is initially powered in the IEEE 802.3af mode and, before
75 msec pass, is switched to the high power IEEE 802.3at mode. Select this mode
if the PD does not perform Layer 2 classification or if the switch performs 2-event
Layer 1 classification.
•
802.3at: The port is powered in the IEEE 802.3at mode and is backward
compatible with IEEE 802.3af. The 802.3at mode is the default mode. In this
mode, if the switch detects that the attached PD requests more power than IEEE
802.3af but is not an IEEE 802.3at Class 4 device, the PD does not receive power
from the switch.
11.
From the Power Limit Type menu, select one of the following options:
•
None: The port draws up to Class 0 maximum power in low power mode and
up to Class 4 maximum power in high power mode.
•
Class: The port power limit is equal to the class of the attached PD.
•
User: The port power limit is equal to the value that is specified in the Power
Limit (W) field. This is the default setting.
Note: If a PD doesn't report its class correctly, these options can preserve PoE power
by preventing the switch from delivering more power than the PD requires. However,
depending on which option you select, a PD that doesn't report its class correctly
might now power up at all.
Note: Power Limit (W) displays a fixed power of 31.2 Watts, and you cannot change
it.
User Manual82Maintain and Monitor the Switch
Gigabit Ethernet Plus Switches
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