In systems where parallel paths are used to increase speed, all paths must have the same propagation time. If the connecting medium is coaxial cable, tight control of mechanical length and dielectric tolerances will produce minimal problems with skew. However, when balanced twisted pairs are the conducting medium, the number of turns per inch is a critical factor in determining propagation time. Commercial CAT5e/6 cable can have as much as 10 nanoseconds of skew between the paths in a one hundred foot run. This equates to as much as ten feet of electrical length within the same cable