Sparticus2311:
The latest standard from the TIA for enhanced performance standards for twisted pair cable systems was defined in February 2008 in ANSI/TIA/EIA-568-B.2-10. Category 6a (or Augmented Category 6) is defined at frequencies up to 500 MHz—twice that of Cat 6.
Cat6a can currently support 10 Gbit/s applications (especially 10GBaseT) up to a maximum distance of 100 meters (330 ft). Cat 7 and Cat7a support 10 Gbit/s even with high margins.
http://en.wikipedia.org/wiki/Category_6_cable
ZinOwl