Page 84 - DCAP406_DCAP_207_Computer Networks

A Profession Un Unit 6: Multiplexing

Unit 6: Multiplexing Notes

CONTENTS
Objectives
Introduction

6.1 Circuits, Channels and Multichanneling
6.2 Multiplexing
6.2.1 Frequency Division Multiplexing (FDM)

6.2.2 Time Division Multiplexing (TDM)
6.2.3 Code Division Multiplexing (CDM)/Spread Spectrum
6.2.4 Wavelength Division Multiplexing (WDM)
6.3 Modem Modulation Techniques
6.4 Modulation of Digital Signal

6.4.1 Amplitude Shift Keying (ASK)
6.4.2 Frequency Shift Keying
6.4.3 Phase Shift Keying (PSK)

6.5 Modulation of Analog Signal
6.5.1 Amplitude Modulation
6.5.2 Frequency Modulation
6.5.3 Phase Modulation
6.6 Summary

6.7 Keywords
6.8 Review Questions
6.9 Further Readings

Objectives

After studying this unit, you will be able to:
Discuss various multiplexing and different multiplexing techniques such as SDM, FDM,
TDM, STDM and CDM

Describe AM, FM and PM concepts for analog to analog modulation
Explain modem modulation techniques.

Introduction

In data communication system, digital and analog communication together plays a very important
and integrated role irrespective of many advantages of digital communications over analog.
Figure 6.1 shows the integrated role of digital and analog communication to complete data
communication system.

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