1. Check whether the PoE port is enabled  2. Check whether the PoE power supply required by the switch for connecting devices exceeds the power supply allowed by the switch. Note: If the required PoE power supply for connected devices exceeds that provided by switches, some devices can not obtain sufficient power supply. 3. Check whether the adapter that supplies power to the switch is damaged， switch another adapter for the switch 4. reset the device 5. Check whether it is the latest version of the firmware, if not upgrade to the newest for the switch. |
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