If the powered device (PD) is in a state in which it does not accept power, the PD is required to place a
resistance above or below the values listed for a valid PD. On the lower end, a range between 12 kΩ and
23.75 kΩ signifies that the PD does not require power. On the higher end, the range is defined to be between
26.25 kΩ and 45 kΩ . Any resistance value less than 12 kΩ and greater than 45 kΩ, is interpreted by the PSE
as a nonvalid PD detection signature.