What if the POE switch does not supply power? We step by step to rule out

There are many power supply methods, such as centralized power supply, independent power supply, 220V AC power supply, and POE power supply. With the use of different occasions, especially POE switches are used very much, but there are also many problems at the same time. The more common one is that the power supply of the POE switch suddenly fails to supply power. What should we do at this time? Don't panic, we can exclude them from the following aspects.

1. When the PD (such as an AP, camera, IP phone, etc.) is working abnormally, first check whether the power supply is abnormal by the working indicator of the PD or the log of the switch.

When the PD's work indicator is always on, the PD is live. If the POE power-off record is not visible in the log of the switch, the PD is not powered down. This type of problem may be caused by port negotiation or AC management.

2. Confirm environmental factors, such as whether the network cable is faulty or the grounding is poor.

During the power-on phase of the POE, you need to detect and classify the PDs that are connected to the device. If there is external interference, the detection and classification may be affected. As a result, the PD cannot be powered on.

3. Confirm whether the switch and power module support POE function and whether the power is sufficient.

4. Collect the on-site information of the problem device and the PD. In addition, you need to know the specific model, power, and support standard (802.3af/802.3at) of the PD.

5. Determine whether the PD under the PD is a standard PD. If it is a non-standard PD, after confirming that it is 48V, you can try the following method:

A, PoEforce-power (power on)

B, PoE legacyenable (power on non-standard devices)

C, PoEhigh-inrush enable (turn on high current surge protection)

D, if power is not available, please collect in diagnostic mode: display PoE chips

6, to confirm whether only some modules of the PD can not supply power:

If you have confirmed that only some of the modules are unavailable, enable LLDP. After the following commands are run, you can enable or disable the PoE function.

[Quidway-Ethernet0/0/3]lldpdot3-tlv power 802.3at

[Quidway-Ethernet0/0/3]undolldp tlv-enable med-tlv power-over-ethernet

Note: The above method is a general solution. If it has not been solved, friends who use Tianbo switch can call our customer service or call our technical staff. Other brands of friends can consult the technical staff of your respective manufacturers.