100-Ohm twisted pair cabling has come a long way since the first launch of the 568 standard. Categories 1, 2, 4, and 5 are obsolete. Category 3 hangs on by a ripcord and Category 5e has already lost its market lead to Category 6. Category 6A is moving out of data centers and demand is increasing for even higher performing cables. Category 7 is officially skipped in the US market and Category 8 is in the ratification process.