Feeding a PoE capable device with variable power supply over TIA568 A cable (DC spares)

The purpose of such a variable power over Ethernet supply would be to test network equipment that are receiving power over PoE under condition of conditions of low voltage or current and determining the behavior or the equipment.

I know that TIA/EIA-568 mode B uses DC+ on blue and DC- on brown wires - the property I would like to use for my testing.

Questions:

  • Is the TIA 568 mode B a property of the network equipment? If so - how do I find out if my device is mode B or mode A?
  • Is connecting a VPS to the spares of mode B wire a possible solution to the problem? Any remarks would be helpful.

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