Hi, 2 recently bought 4507-E switches with WS-X4648-RJ45V-E (02) linecards seem not to be able to drive 70 meter of CAT6 cable on Gigabit line speed. End device shows continuous RX errors and every now and then line drops. POE not used. Using other types of Cisco switches such as Catalyst 3750-E or low cost SML2008 works without a problem (even up to and above 100m spec). Is this a known issue with the 4500 platform and mentioned linecard? Can it be 'solved'?