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TPS2384: how to check detect fail waveform

Part Number: TPS2384

Tool/software:

Hi 

when I connect USB camera with shieding  cable, the POE function won't work.

But whe I connect USB camera with non-shieding calbe, then POE function is ok.

and I find the detect wavefrom on fail status, is smaller than normal status waeform.

and I try check my invalid wavefrom and compare to figure 6-1, But I don't how to check does my fail is Rdetect is to too high (33k) or is too low (15K)

Can you help to suggest is detect wavefrom level is small , does it mean Redtec is too high or too low ?