Wikipedia
Category 6 cable (Cat 6), is a standardized twisted pair cable for Ethernet and other network physical layers that is backward compatible with the Category 5/5e and Category 3 cable standards Cat 6 has to meet more stringent specifications for crosstalk and system noise than Cat 5 and Cat 5e The cable standard specifies performance of up to 250 MHz, compared to 100 MHz for Cat 5 and Cat 5eWhereas Category 6 cable has a reduced maximum length of 55 meters when used for 10GBASE-T, Category 6A cable (or Augmented Category 6) is characterized to 500 MHz and has improved alien crosstalk characteristics, allowing 10GBASE-T to be run for the same 100 meter maximum distance as previous Ethernet variants
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