Reel Time February 2009, Cabling Business Magazine
A: UTP cable has become the dominant medium in data communications, but UTP systems depend on electrical balance between signals transmitted over each pair. Simply put, twisted-pair cable is a “balanced” media because the system is designed to cancel electrical interference based on the pair’s physical symmetry – or “balance” between each other. The conductors of the pair should be manufactured identical to each other and twisted at the same rate over the length of the cable. When this occurs, the data current and voltage of each conductor is equal magnitude, but in opposite polarity. Unwanted coupled noise will be of equal levels, same polarity, on each conductor which allows for its cancellation by the receiving equipment .