What do all of these different Cats mean?
Category 5 was standardised in 1995 and will support LANs requiring speeds of up to 100Mbit/s Ethernet. Cat 5 has a 100MHz classification.
Category 5e was introduced to take account of new requirements introduced with Gigabit Ethernet and ATM (155MBit/s). Category 5e will provide LAN speeds of up to 1000MBit/s. Cat 5e also has a 100MHz Classification.
Category 6 is currently the highest performing copper cabling solution available. An investment in a category 6 cabling system will provide plenty of headroom for future bandwidth requirements. Cat 6 has a 200MHz Classification.