What's the difference between Cat5e, Cat6, and Cat6a?

Cat5e cabling cat6 cabling  cat6a cabling
 CATEGORY 5e
 CATEGORY 6 
CATEGORY 6a

1000BASE-T Network*

1000BASE-TX Network*

10 Gigabit Network*

 100 MHz Frequency  250 MHz Frequency 500 MHz Frequency
cat5e cross section cat6 cross section cat6a cross section

*(up to 100 meters). Data borrowed from http://www.cablek.com/technical-reference/cat-5---5e--6--6a---7--standards

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