I have 3 separate sections of CAT5e solid core UTP. 7m, 20m and 35m. I have tested them and all lines are fine. When i plug each one into my netcomm 4port modem router, the ports light up respectively but i cannot ping it from any of the three computers connected to each cable. When i use .5m there seems to be no problem. Has anyone had a problem like this? Any suggestions?