Disconnect the network cable from the PoE switch
Disconnect the PoE cable between the Ethernet switch port and the PDs which are unavailable to get powered. If the PDs can receive power when connected to other PoE ports, it proves the fault on certain ports. A PoE PD failing to boot up is one of the most frequently seen errors among PoE faults, caused by the PoE component issues or the wrong configuration command.
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