Abstract
This chapter discusses cabling. Local-area-network experts frequently blame cabling problems for computer system failures. At least 75 percent of network computer problems are caused by the cable and cable connectors. Price is a major consideration when considering cable installation. The unshielded twisted-pair cable, commonly called telephone cable, contains two insulated wires twisted around each other. If that same cable had a metallic covering, such as an aluminum polyester tape, it would be called shielded twisted pair. This is the lowest priced and most commonly used cable in newly installed industrial computer networks. Coaxial cable is a two-conductor transmission line comprising one conductor completely enclosed within another, which serves as its shield. While twisted-pair and coaxial cables are metallic cables, fiber optic cable is made of glass and uses light transmitted through optical fibers for communication or signaling. The inherent properties of a cable can also be influenced by the quality of the wire and cable manufacturer. Therefore, it is imperative to buy wire and cable from a reputable manufacturer—one that has a thorough understanding of the complexities and requirements of making wire and cable.
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