My understanding is that "Twisted Pair" cabling contains the same length cables, and the occurence of the twists is done per an industry standard defining the different Categories. The difference in classifications of the cables is mainly through electrical performance criteria. The electrical performance of these cable can be found in document "TIA/EIA 568-A: Commercial Building Telecommunications Cabling Standard", often referred to as just 568-A.
The twisting is done to increase the cables rejection of noise and interference.
I guess the BICSI course and RCDD designation paid off....I remember stuff!!!
