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Figure 2.11: Coaxial Cable For LANs, coaxial cable offers several advantages. It can run for longer distances between network ~nodes than either STP or UTP cable. Coaxial cable is less expensive than fiber-optic cable, and the technology is well known. UTP Cable Unshielded twisted-pair cable (UTP) is a four-pair wire medium composed of pairs of wires. It is used in a variety of networks. Each of the eight individual coppers wires in the UTP cable is covered by insulating material. Each pair of wires are also twisted around each other. This type of cable relies solely on the cancellation effect, produced by the twisted wire pairs, to limit signal degradation caused by EMI and RFI. To further reduce cross talk between the pairs in UTP cable. UTP has an external diameter of approximately .43 cm, its small size can be advantageous during installation. Since UTP can be used with most of the major networking architectures, it continues to grow in popularity.
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Figure 2.12: Unshielded Twisted Pair (UTP) Cable 29