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04Chapter04 - CHAPTER 4 Transmission Media Computers and...

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79 CHAPTER 4 Transmission Media Computers and other telecommunication devices use signals to represent data. These signals are transmitted from one device to another in the form of electromagnetic energy. Electromagnetic signals can travel through a vacuum, through air, or through other transmission media. Figure 4.1 shows the electromagnetic spectrum. Transmission media for LANs can be divided into two broad categories: guided and unguided (see Figure 4.2). Figure 4.1 Electromagnetic spectrum Figure 4.2 Classes of transmission media Power, voice Infrared light Ultra- violet light 0 3 kHz 300 GHz Visible light, 430 Ð 750 THz Radio communication Radio, microwave, satellite X, gamma, cosmic rays Transmission media Guided Unguided
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