When the PoE power supply fails, it can be investigated from the following four aspects.
• Check whether the receiving end device supports PoE power supply. Since not all network devices can support PoE power technology, check the equipment for POE power technology before connecting it to a PoE switch. Although PoE will be detected when working, it can only detect and power the receiving device supporting the POE power supply technology. If the PoE switch does not supply power, it may be because the receiving device cannot support the PoE power supply technology.
• Check that the power of the receiving device exceeds the maximum power of the switch port. For example, a POE switch that only supports the IEEE 802.3af standard (the maximum power of each port on the switch is 15.4W) is connected to a power receiving device of 16W or larger, and the receiving device may damage the equipment due to power failure or power instability, resulting in power failure and PoE supply failure.
• Check whether the total power of all connected receiving devices exceeds the power budget of the switch. When the total power of the connected equipment exceeds the power budget of the switch, the PoE power supply will fail.for instance, A 24-port PoE switch with a power budget of 370W, If the switch follows the IEEE 802.3af standard, It can be connected to 24 receiving devices following the same standard (because the power of this type of equipment is 15.4W, Connect 24 equipment with a total power of 369.6W, Not exceeding the switch power budget); If the switch follows the IEEE802.3at standard, Only 12 receiving devices following the same standard (since the power of this type is 30W, Connecting to the 24 units will exceed the power budget of the switch, Therefore, only 12 units can be connected).
• Check whether the power supply mode of the receiving device (PSE) is compatible with the receiving device (PD). For example, the PoE switch uses mode A, while the connected receiving device can only receive power transmission from mode B, which will not be power.
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