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1 Pertemuan 3 Networking Fundamentals Matakuliah: M0284/Teknologi & Infrastruktur E-Business Tahun: 2005 Versi: >

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Presentation on theme: "1 Pertemuan 3 Networking Fundamentals Matakuliah: M0284/Teknologi & Infrastruktur E-Business Tahun: 2005 Versi: >"— Presentation transcript:

1 1 Pertemuan 3 Networking Fundamentals Matakuliah: M0284/Teknologi & Infrastruktur E-Business Tahun: 2005 Versi: >

2 2 Learning Objectives Differentiate between Analog and Digital Signals Understand Modulation and Multiplexing

3 3 Overview Digital and Analog Modulation AM and FM Multiplexing FDM and TDM

4 4 Analog and Digital

5 5 Digital and Analog Digital technologies are a fundamental building block of the platform that makes E-Business possible. Computers are digital. Most transmission systems are becoming digital. Digital: Discrete Analog: Continuously changing Advantages of Digital: –Easier to recover signals after distortion. –Digital signals can be converted to numbers –Existing technologies are largely digital

6 6 Digital: Signal Regeneration

7 7 Analog to Digital Conversion Signals in nature, sound and light, are analog Technology is increasingly digital Need to change analog to digital.. Music CDs, Digital telephony, digital cellular phone Analog wave described as a set of discrete points

8 8 Digital Signals: Pulse Code Modulation

9 9 Pulse Code Modulation PCM Used in digital telephone transmission Music CD-ROMs DVDs for movies and music Sound Cards in PCs. Multimedia applications In telephony: sampling done 8000 times per second, each time 8 bits are transmitted. That is, 64Kilobits/second to represent voice

10 10 Modulation: AM and FM Most transmission media accept only continuous signals Information from computers in 1s and 0s Need to use continuous signals to transmit digital values Use a wave’s amplitude, frequency and phase and modulate them Used in Modem (modulator + demodulator)

11 11 Modulation: A smooth wave

12 12 Amplitude Modulation Change amplitude, keep frequency constant

13 13 Frequency Modulation Change frequency, keep amplitude constant

14 14 Multiplexing To send multiple signals over the same media simultaneously. Enhance media capacity FDM: Frequency division multiplexing TDM: Time division multiplexing Digital cellular phones use TDM and FDM to transfer signals Digital telephone systems use multiplexing

15 15 Frequency Division Multiplexing Multiple channels on different frequencies

16 16 Time Division Multiplexing Splitting time into different channels

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