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In contrast to voice systems, data communications cabling systems have undergone many changes during this same period. Data network cabling has evolved from the proprietary solutions of the 1970s, with shielded twisted-pair and coaxial cabling, to the rise of standards-compliant structured wiring systems in the late 1980s, when unshielded twisted-pair, or UTP, and optical-fiber cable predominated. In addition, data communications is no longer confined to a particular department or even a single company. The exchange of information is essentially without boundaries.
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