Because the signals are transmitted over multiple pairs of wires to get the full aggregate bit rate.Not sure why they are listed as Cat6 but only certified to 350MHz
Below is a post I made the other day clarifying someones incorrect information, this will break down the cable differences and provide a reference as well as additional info.I thought I read that Cat6 was supposed to be 500 or 550 MHz. Maybe I mis-read something.
Cat 6a is a little thicker than Cat 6 (typically 23 gauge vs 24 gauge). There typically in most quality cable is also a plastic sleeve around the individual copper pairs, as well as Cat 6a is tighter wound thus creating more twists resulting in more copper per foot. You also have a reduction in crosstalk among pairs in Cat6a. These are some of the differences that allow you to achieve full 10 Gigabit throughput at full standards distance (328ft).Thanks for the simple explanation! Dare I ask what the basic difference between Cat6 & Cat6a?