Fiber optic cable twisted pair cable
UTP cables typically contain four pairs of copper wires, with each pair containing two wires twisted together. A metal shield, which consists of metal foil or braid, surrounds the bundle of insulated pairs. Where electromagnetic radiation is a serious issue, each pair of wires may be individually shielded in addition to the outer shield. Category 1, or Cat1, and Cat2 were not officially standardized, but de facto standards developed over time.
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