 What is the CAT 6A cabling speed? The maximum frequency for CAT 6A cable is 500 MHz. This is an increase from 250 MHz for CAT 6 cable and an increase from 100 MHz for the CAT 5B cable. CAT 6A cabling is also ratified for 10 gigabit transmission over the standard permanent link length of 90 meters. Previously, CAT 6 was only capable of 10 gigabits up to 55 meters.