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Manage Power over Ethernet
369
Insight Managed 28-Port and 52-Port Gigabit Ethernet Smart Cloud Switches
The settings that you configure apply to all selected PoE+ ports.
Menu Item Description
Port Power Select the administrative mode of the port:
• Enable. The port’s capacity to deliver power is enabled. This is the default
setting.
• Disable. The port’s capacity to deliver power is disabled.
Port Priority The port priority determines which ports can still deliver power after the total
power delivered by the switch exceeds the total power budget of 390W. (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.
Select one of the following priorities:
• Low. Low priority. This is the default setting.
• Medium. Medium priority.
• High. High priority.
• Critical. Critical priority.
Power Mode Select the one of the following power modes:
• 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 switch
performs 2-event Layer 1 classification.
• 802.3at. The port is powered in the IEEE 802.3at mode. This is the default
mode. In this mode, if the switch detects that the attached PD is not a Class
4 device, the PD does not receive power from the switch.
Power Limit Type The power limit type controls the maximum power that a port can deliver. Select
one of the following types:
• 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 does not report its class correctly, use of these options can preserve
additional PoE power by preventing the switch from delivering more power than the
PD requires. However, depending on which option you select, a PD that does not
report its class correctly might not power up at all.
Power Limit (W) Enter the maximum power (in watts) that the port can deliver.
The range is 3.0–30.0W, with 0.1W steps. The default is 30W.
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