chapter 3 part A_stud_ver - ECP 2056 DATACOMMUNICATIONS AND...

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FACULTY OF ENGINEERING, CYBERJAYA YEAR 2008 ECP 2056 : DATACOMMUNICATIONS AND COMPUTER NETWORKING Saiful Jumaat Osman, SUPELEC France 3.1 Transmission media – guided &  unguided 3.2 Bandwidth utilization: multiplexing –        FDM, TDM & WDM, SPREAD SPECTRUM CHAPTER 3 : Characteristics of Data Communication Networks
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3.1 Transmission media – guided &  unguided ECP 2056 : DATACOMMUNICATIONS AND COMPUTER NETWORKING
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3 Figure 1 Transmission medium and physical layer 3.1 Transmission media – guided &  unguided Signals travel along the media, directed and contained by the physical limits of the medium
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4 Figure 2 Classes of transmission media 3.1 Transmission media – guided &   unguided
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5 GUIDED MEDIA GUIDED MEDIA Guided media, which are those that provide a Guided media, which are those that provide a conduit from one device to another, include twisted- conduit from one device to another, include twisted- pair cable, coaxial cable, and fiber-optic cable. pair cable, coaxial cable, and fiber-optic cable. Topics discussed in this section: Topics discussed in this section: 3.1 Transmission media – guided &   unguided 3 main types of transmission medium used for  wired LANs: - Twisted pair - Coaxial cable [coax] - Optical Fiber
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6 Figure 3 Twisted-pair cable 3.1 Transmission media – guided &   unguided Two type: shielded and unshielded Used primarily in star and tree/hub network Unshielded twisted pair [UTP]: - does not include any extra shielding around the wire pair - ordinary telephone line and commonly used for LAN - least expensive, easy to work [less rigid], simple to install - subject to external electromagnetic interference - limited length
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7 Figure 4 UTP and STP cables 3.1 Transmission media – guided &   unguided Shielded twisted pair [STP]: - Covered with foil shield [polyester covered with aluminum  on both sides] to reduced interference and crosstalk - Better performance, but more expensive and difficult to  work then UTP [heavy and bulky]
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8 Table 1 Categories of unshielded twisted-pair cables 3.1 Transmission media – guided &   unguided
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9 Figure 5 UTP connector 3.1 Transmission media – guided &   unguided
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10 Figure 6 Coaxial cable 3.1 Transmission media – guided &   unguided
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11 Table 2 Categories of coaxial cables 3.1 Transmission media – guided &   unguided Coaxial Cable Used primarily in bus networks Operating with either baseband or broadband Baseband: - all available bandwidth is used to derive a single transmission channel Broadband: - available bandwidth is divided to derived a number of lower bandwidth subchannels on one cable
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12 Figure 7 BNC connectors 3.1 Transmission media – guided &   unguided
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13 Figure 8 Bending of light ray 3.1 Transmission media – guided &   unguided OPTICAL FIBER : Provides a medium for signals using light instead of electricity
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14 Figure 9 Optical fiber 3.1 Transmission media – guided &   unguided
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