POE switch does not supply power
Cause analysis:
The device does not support POE power supply: The powered device itself does not have the POE power receiving function, or the device is incompatible with the POE standard of the switch. For example, some old devices may not support POE power supply, and when the switch supplies power according to the POE standard, the device cannot receive power normally.
Insufficient power supply: The single port or total power supply of the POE switch is limited. If the power demand of the connected powered device exceeds the power supply capacity of the switch, no power supply will occur. For example, when a 15.4W POE switch is used to power a device with a power demand greater than 15.4W, the device cannot work properly.
Network cable problem: Poor quality of network cable, too long length, irregular or damaged crystal head, etc., may cause abnormal power transmission, making the powered device unable to obtain enough power. For example, using a low-quality network cable with high resistance will cause excessive power loss.
Switch failure: Failure of the switch's POE chip, power module and other hardware, or incorrect software configuration of the switch, can also lead to power failure.
Poor grounding: During the POE power-on phase, the devices hanging below need to be detected and classified. If there is external interference, it may affect the judgment of detection and classification, resulting in failure to power on the device. Poor grounding is an important factor in generating external interference.
Solution:
Confirm whether the powered device supports POE power supply: Check the device manual or consult the device manufacturer to confirm the power supply method and standard supported by the device. If the device does not support POE power supply, it needs to be replaced with a device that supports POE power supply, or use a separate power adapter to power the device.
Check the power supply power: Confirm the power demand of the powered device and check whether the port power supply power and total power supply power of the POE switch meet the device's requirements. If the power is insufficient, you need to ｒｅｐｌａｃｅ a POE switch with a higher power or reduce the number of connected devices.
Check the network cable: ｒｅｐｌａｃｅ a network cable of good quality, appropriate length and in compliance with the standard to ensure that the crystal head is made in accordance with the specifications. It is recommended to use oxygen-free copper network cables and try to control the length of the network cables within 100 meters.
Check the switch: Check whether the indicator light of the switch is normal and whether there is any error message. If possible, you can try to restore the switch to factory settings and reconfigure it. If the hardware fails, you need to contact the manufacturer for repair or replacement.
Ensure good grounding: Reliably ground the POE switch to eliminate the impact of poor grounding on power supply.
POE switch network connection is unstable
Cause analysis:
Transmission distance is too long: The straight-line distance of POE power supply generally cannot exceed 100 meters. After exceeding this distance, the data signal will be lost, resulting in unstable network connection. For example, in large-scale monitoring projects, if the distance between the POE switch and the powered device is too long, signal attenuation is likely to occur.
Electromagnetic interference: The presence of other electronic devices or strong magnetic fields around the POE switch will generate electromagnetic interference and affect the transmission of network signals. For example, in some industrial environments, there are a large number of electrical equipment, which may interfere with the network connection of the POE switch.
Insufficient switch performance: If the processing power, cache size and other performance indicators of the POE switch are insufficient and cannot meet the transmission requirements of large amounts of data, it will also cause unstable network connections. This problem is especially likely to occur when there are a large number of connected powered devices and a large amount of data traffic.
Solution:
Control the transmission distance: Try to keep the distance between the POE switch and the powered device within 100 meters. If the distance is too long, you can consider using optical fiber or other methods to extend the transmission distance, or add relay equipment.
Avoid electromagnetic interference: Keep the POE switch away from other electronic devices or strong magnetic fields, or use anti-interference measures such as shielded network cables to reduce the impact of electromagnetic interference on network connections.
ｒｅｐｌａｃｅ a switch with better performance: If the unstable network connection is caused by insufficient switch performance, you can ｒｅｐｌａｃｅ a POE switch with stronger processing power and larger cache to meet the needs of network transmission.
Port negotiation problem
Cause analysis: The failure of port negotiation between the POE switch and the powered device may be caused by network interface failure, driver problems, device configuration errors, etc.
Solution:
Restart the device: Try to restart the POE switch and the powered device, and re-negotiate the port.
ｕｐｄａｔｅ the driver or firmware: If the port negotiation problem is caused by the low version of the device driver or firmware, you need to ｕｐｄａｔｅ the device driver or firmware.
Check the device configuration: Confirm whether the network configuration of the device is correct, such as whether the IP address, subnet mask, gateway and other settings match the network environment. If the device configuration is incorrect, you need to reconfigure it.
POE switch overheating
Cause analysis: Long-term operation of the POE switch, poor ventilation, high ambient temperature, etc. may cause the switch to overheat. Overheating of the switch will affect its performance and stability, and may even cause damage to the device.
Solution:
Improve ventilation conditions: Make sure there is enough space around the POE switch for air circulation. The switch can be installed in a well-ventilated location, or use fans and other equipment to enhance ventilation.
Lower the ambient temperature: If the ambient temperature is too high, you can take cooling measures, such as installing air conditioners, using radiators, etc., to lower the ambient temperature.
Check the device cooling system: If the cooling system of the switch fails, you need to contact the manufacturer in time for repair or replacement.