If it is improperly grounded, the shield acts like an antenna and In addition, the metallic shielding must be grounded atīoth ends. STP cabling also can use the same RJ connectors that UTP uses.Īlthough STP prevents interference better than UTP, it is more expensive andĭifficult to install. With STP data connector, which is created especially for the STP cable. STP reduces electrical noise both within the cable (pair-to-pair coupling, orĬrosstalk) and from outside the cable (EMI and RFI). As specified for use in Ethernet network installations, The four pairs of wires then are wrapped in an overall metallic braid or foil, Each pair of wires is wrapped in a metallic Shielded twisted-pair (STP) cable combines the techniques of shielding,Ĭancellation, and wire twisting. Of 24 American Wire Gauge (AWG) copper wires. Can transmit data atĬategory 5≼an transmit data at speeds up to 100Ĭategory 5e Used in networks running at speeds up to 1000Ĭategory 6Typically, Category 6 cable consists of four pairs Can transmit data atĬategory 4Used in Token Ring networks. Not suitableĬategory 2≼apable of transmitting data at speeds up to 4Ĭategory 3Used in 10BASE-T networks. The following summarizes the features of UTPĬommonly used types of UTP cabling are as follows:Ĭategory 1Used for telephone communications. In fact, UTP is considered the fastestĬopper-based medium today. It is for coaxial and fiber-optic cables.Īlthough UTP was once considered to be slower at transmitting data than other Networking media, and the distance between signal boosts is shorter for UTP than UTPĬable is more prone to electrical noise and interference than other types of And because UTP can be used with most of the major networkingĪrchitectures, it continues to grow in popularity.ĭisadvantages also are involved in using twisted-pair cabling, however. In fact, UTP costs less per meter than any other type of LANĬabling.
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UTP cable is easy to install and is less expensive than other types of Important factor to consider, particularly when installing a network in an olderīuilding. Up wiring ducts as rapidly as other types of cable. Because it has such a small external diameter, UTP does not fill Because UTP has an external diameter ofĪpproximately 0.43 cm (0.17 inches), its small size can be advantageous during That used for telephone wiring, which has impedance of 600 ohms. Ohms this differentiates it from other types of twisted-pair wiring such as UTP used as a networking medium has an impedance of 100 When used as a networking medium, UTP cable has four pairs of either 22- orĢ4-gauge copper wire. RJ-45 is an eight-wire connector used commonly to connect computers onto a local-area UTP cable often is installed using a Registered Jack 45 (RJ-45) connector (see UTP cable must follow precise specifications governing how many twists or braidsĪre permitted per meter (3.28 feet) of cable. To further reduce crosstalkīetween the pairs in UTP cable, the number of twists in the wire pairs varies. (EMI) and radio frequency interference (RFI). Wire pairs to limit signal degradation caused by electromagnetic interference UTP cable relies solely on the cancellation effect produced by the twisted In addition, the wires in each pair are twisted around each other. Individual copper wires in UTP cable \is covered by an insulating material. UTP cable is used in a variety of networks. UTP cable is a medium that is composed of pairs of wires (see FigureĨ-1). The following sections discuss UTP and STP Two basic types of twisted-pair cable exist: unshielded twisted pair (UTP)Īnd shielded twisted pair (STP). Provide self-shielding for wire pairs within the network media. UsingĬancellation together with twisting the wires, cable designers can effectively Twisting the wires can enhance this cancellation effect.
They also cancel out any outside magneticįields. Their magnetic fields are the exact opposite of each other. When two wires in an electrical circuit are placed close together, When electricalĬurrent flows through a wire, it creates a small, circular magnetic field around The pairs are twisted to provide protectionĪgainst crosstalk, the noise generated by adjacent pairs.
A pair of wires forms aĬircuit that can transmit data. Twisted-pair cable is a type of cabling that is used for telephoneĬommunications and most modern Ethernet networks. This chapter describes theĬommon types of network media, including twisted-pair cable, coaxial cable,įiber-optic cable, and wireless. Travels as it moves from one component to another. Network media is the actual path over which an electrical signal Upon completing this chapter, you will be able to:ĭescribe the primary types and uses of twisted-pair cablesĭescribe the primary types and uses of coaxial cablesĭescribe the primary types and uses of fiber-optic cablesĭescribe the primary types and uses of wireless mediaĬompare and contrast the primary types and uses of different media