Ch+3+Communication+Media

Ch+3+Communication+Media - Chapter Three Conducted and...

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Unformatted text preview: Chapter Three Conducted and Wireless Media Data Communications and Computer Networks: A Business User's Approach, Fourth Edition 2 Discussion Questions for Chapter 3 What are the characteristics, advantages and disadvantages of twisted pair wire? What are the differences among Category 5, 5e, 6, and 7 twisted pair wire? When is shielded twisted pair wire a better choice than unshielded twisted pair wire? What are the characteristics, advantages, and disadvantages of coaxial cable and fiber-optic cable What are the characteristics, advantages and disadvantages of terrestrial microwave systems? 3 Key Chapter 3 Discussion Questions What are the characteristics, advantages, and disadvantages of satellite microwave systems? What are the differences among low-Earth-orbit, middle-Earth-orbit, geosynchronous orbit, and highly elliptical Earth orbit satellites? What are the key components of cellular systems? How are mobile-to-mobile connections established? How are mobile-to-landline connections established? What are the characteristics (and uses) of short- range wireless transmissions, such as Bluetooth? 4 Other Chapter 3 Questions What are the major components of WiMax and other broadband wireless systems? What transmission techniques are used in wireless local area networks? What factors should be considered when selecting data communication media for particular applications? 5 Introduction The world of computer networks would not exist if there were no medium by which to transfer data The two major categories of media include: Conducted media Wireless media 6 Twisted Pair Wire One or more pairs of single conductor wires that have been twisted around each other Twisted pair wire is classified by category. Twisted pair is currently Category 1 through Category 7, although Categories 2 and 4 are nearly obsolete Twisting the wires helps to eliminate electromagnetic interference between the two wires Shielding can further help to eliminate interference 7 Twisted Pair Wire (continued) 8 Twisted Pair Wire (continued) 9 Twisted Pair Wire (continued) 10 Twisted Pair Wires Twisted-pair wires are currently the most common media in LANs. These are classified in several ways including: AWG rating (gauges from 22 to 26 are most common) Unshielded (UTP) or shielded (STP); UTP is most common, STP is more expensive than UTP. EIA/TIA category: Cat 5 or higher is most common PVC vs. plenum . PVC (polyvinyl chloride) insulation is most common; plenum is more expensive RJ-45 connectors are the most common twisted-pair connectors in LANs 11 Twisted Pair Wire (continued) 12 Coaxial Cable A single wire wrapped in a foam insulation surrounded by a braided metal shield, then covered in a plastic jacket. Cable comes in various thicknesses Baseband coaxial technology uses digital signaling in which the cable carries only one channel of digital data Broadband coaxial technology transmits analog signals and is capable of supporting multiple channels 13 14 Coaxial Cable (continued) 15 Coaxial Cable (continued) 16...
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This note was uploaded on 04/04/2008 for the course IT 3134 taught by Professor Whitworth during the Spring '08 term at Georgia Southern University .

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Ch+3+Communication+Media - Chapter Three Conducted and...

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