Power Delivery; Enabling Poe To The Switch; Power Reserve Budget Per Slot - Extreme Networks ExtremeWare XOS Guide Manual

Power Over Ethernet
NOTE
If your chassis has an inline power module and there is not enough power to supply the configured inline power for
the slot, that slot will not power on; the slot will not function in data-only mode without enough power for inline
power.
If a PoE module is inserted into a chassis, the chassis calculates the power budget and only powers up
the PoE module if there is enough power. Installed modules are not affected. However, if you reboot the
chassis, power checking proceeds as described in the previous paragraph. If there is now enough power,
I/O modules that were not powered up previously are powered up.
If you lose power or the overall available power decreases, the system removes power to the I/O
modules beginning with the highest numbered slots until enough power is available. Inline power
reserved for a slot that is not used cannot be used by other PoE slots (inline power is not shared among
PoE modules).
Before you install your PoE module, consult your sales team to determine the required power budget.

Power Delivery

This section discusses how the system provides power to the PDs.

Enabling PoE to the Switch

You enable or disable inline power to the entire switch, or per slot or per port. Then you must reserve
power for each PoE Slot (refer to "Power Reserve Budget Per Slot"). By default, 50 watts of inline power
is provided to each slot.
To enable inline power to the switch, slot, or port, use the following commands:
enable inline-power
To disable inline power to the switch, use the following command:
disable inline-power
Disabling inline power removes power immediately to all connected PDs. The default value is enabled.

Power Reserve Budget Per Slot

The power budget is provided on a per slot basis, not switchwide. You reserve power for each slot, or
PoE module. Power reserved for a specific PoE module cannot be used by any other slot regardless of
how much power is actually consumed on the specified slot. The default power budget reserved for
each PoE module is 50 W. The minimum power you can assign to a slot is 37 W, or 0 W if the slot is
disabled. The maximum possible for each slot is 768 W.
To reduce the chances of ports fluctuating between powered and non-powered states, newly inserted
PDs are not powered when the actual delivered power for the module is within approximately 19 W of
the configured inline power budget for that slot. However, actual aggregate power can be delivered up
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ExtremeWare XOS 11.1 Concepts Guide