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Twisted Pair Cabling

Innova's Twisted Pair Cabling

    Unshielded Twisted Pair (UTP) continues to be developed for use in voice applications and local area networks or lan. Because of the reasonably low cost, this cable is extensively used and is available in several different efficiency categories. For Example Cat3, Cat5, Cat5e and Cat6. Over 99% of our copper installations are Unshielded Twisted Pair (UTP) as opposed to shielded twisted pair (STP), which is rarely used.

    Electromagnetic interference is present in all types of cabling to some degree. There are two basic types of electromagnetic interference (EMI) that cable engineers get worried about-electromagnetic emissions and electromagnetic immunity. Emissions related to energy that is radiated by the cable, and immunity is the ability of the cable to reject external signals. In local area networks (LANs), failure to properly manage EMI or electromagnetic interference can have a damaging result on the integrity of the signal getting transmitted.

    In an unshielded cable, cautious design of the cable and the connected electronic equipment benefits in a "balance" of the currents in the two conductors of a pair. That is, the currents in the two conductors are equal in magnitude but flowing in opposite directions. Proper installation and termination of the cable is also significant to retaining this balance. In a balanced system, there is minimal radiation of EMI given that the external field from one conductor is effectively terminated by the external field from the other conductor in the pair.

    Typically, the more twists per foot of cable, the greater the cable is electrically balanced. Category 5e (Cat5e) cable has more twists per foot than Category 3 or 5 cables and, therefore, offers better defense against   EMI problems.