Amer Networks SD4P4 - Manual (Page 14)

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PoE MAX:
On: The system has less than 7.5W of power remaining to power
PoE devices. If this LED is on, the system will not provide
power to any additional PoE devices connected to the Switch.
Off: The system has more than 7.5W of power remaining to power
PoE devices.
Ethernet port status LEDs (Ports 1~8)
10/100M Link/ACT:
10M: When on, the port is successfully connected to a device running
at 10 Mbps. When flashing, the port is transmitting or receiving
data.
100M: When on, the port is successfully connected to a device
running at 100 Mbps. When flashing, the port is transmitting or
receiving data.
Off: No link.
PoE Rule
PoE Max: this function helps to protect the PoE Switch and to
stabilize the power transmitted to the powered devices (PD).
If the remaining system power for PoE is below 7.5 watts, the PoE
MAX LED will light up and the system will not provide power to any
PoE devices connected to the switch to protect the PoE Switch itself
and to stabilize the power transmitted to other PoE devices plugged in
the Switch.