PoE power priority

If a PSE can provide power for all connected PD demand, it does not use its power priority settings to allocate power. However, if the PD power demand oversubscribes the available power, the power allocation is prioritized to the ports that present a PD power demand. This causes the loss of power from one or more lower-priority ports to meet the power demand on other, higher-priority ports. This operation occurs regardless of the order in which PDs connect to the module's PoE-enabled ports.

Power allocation is prioritized according to the following methods:
Priority class

Assigns a power priority of low (the default), high, or criticalto each enabled PoE port.

Port-number priority

A lower-numbered port has priority over a higher-numbered port within the same configured priority class, for example, port A1 has priority over port A5 if both are configured with high priority.