I think you are getting MHz and Mb/s confused. Based on the electrical characteristics, the IEEE uses modeling to determine the number of Megabits that can travel a channel which is based on several factors; one important one is encoding. The MHz rating simply states the electrical performance/impedance of the cable plant. The equations used for each speed of traffic can be found in the IEEE standards which include all of the pertinent information.
Last Wiki Answer Submitted: October 10, 2008 5:37 pm by Carrie Higbie640 pts.