Are the signals on the two pairs polarity sensitive ? I never thought much on this and I don't even know what the signals are. We are troubleshooting a network with lots of packet errors. The customer has not noticed any degradation yet, but our monitor keeps going into alarm. Anyway, we found the green pair reversed, on the router to switch cable, but it must have been for some time, and the problem is recent. This has been corrected, cable tests out now. Not enough data yet to tell if that fixed it. Just wondering.