How to troubleshoot PoE power supply anomalies? Six major reasons!

This issue shares PoE power supply related knowledge with you. When the PoE power supply of network equipment is abnormal, you can check from the following aspects:

1. Confirm whether the PoE device is operating normally

Check whether the power indicator of the PoE switch or PoE injector is on. If the indicator is not on, it may be that the power adapter is faulty or not plugged in properly. Please try to replace the power supply or replug the power supply.

Check the management interface of the PoE device to confirm whether the PoE function is turned on and whether the relevant power supply parameters are set correctly, such as power supply voltage, power, etc.

2. Check the network cable

Check if the network cable shows signs of damage, breakage or aging. If so, replace the network cable.
Check if the crystal plugs at both ends of the network cable are firmly installed and if they are loose or oxidized. You can re-plug or replace the crystal plugs with new ones.
Use a network cable tester to detect the connectivity and line sequence of the network cable to ensure that the network cable can transmit data and power normally.
3. Confirm whether the powered device supports PoE

Check the manual or product specifications of the powered device (such as wireless access points, IP cameras, etc.) to confirm whether it supports PoE power supply and the supported PoE standards (such as 802.3af, 802.3at, etc.).
If the powered device does not support PoE, use a PoE splitter to separate the data and power in the network cable and then power the device separately.

4. Check the power requirements of the powered device

Check the nameplate or manual of the powered device to understand its power requirements and compare it with the power supply power of the PoE device.
If the power of the powered device exceeds the power supply capacity of the PoE device, it may cause power supply abnormality. At this time, you need to replace the PoE device with a higher power or reduce the number of powered devices.
5. Check the network environment interference
Check whether there are strong electromagnetic interference sources nearby, such as large motors, transformers, microwave ovens, etc. These devices may interfere with PoE power supply.
Keep the PoE device and network cable away from these interference sources as much as possible, or use shielded network cables and shielded crystal plugs to reduce interference.



6. Upgrade device firmware and drivers
Check whether the firmware and drivers of the PoE device and the powered device are the latest version. If there is an update, try to upgrade to the latest version to fix possible software problems.

If the above troubleshooting methods cannot solve the problem, it may be that the PoE device or the powered device has a hardware failure. It is recommended to contact the equipment supplier or professional technicians for further inspection.