Amer Networks SD4P4 - Manual (Page 15)

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Example: If there are PoE devices connected to the Switch with a total
power consumption of 25 watts, the Switch only has 5 watts
remaining as a buffer, and the PoE MAX LED will light up. If another
POE PD inserted, the system will not provide power to the additional
POE PD.
Priority: If the PoE devices connected to the Switch exceed the 30
watt power consumption limit, the Switch will provide power to the
devices according to their priority. Priority is determined by the
number of the port, with port 1 having the highest priority and port 4
having the lowest.
Example: A PoE device connected to Port 2 is using 14 watts and
another device connected to Port 3 is using 8 watts. If a PoE device is
connected to Port 1 which requires 10 watts, the Switch will provide
power to Ports 1 and 2, and not Port 3.