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Chapter Two Data and Signals Fundamentals of
Fundamentals of Networking and Data Communications Sixth Edition

Copyright ©2011 Cengage Learning. All rights reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible web site, in whole or in part.

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Objectives
After reading this chapter, you should be able to: • Distinguish between data and signals, and cite the advantages of digital data and signals over analog data and signals • Identify the three basic components of a signal • Discuss the bandwidth of a signal and how it relates to data transfer speed • Identify signal strength and attenuation, and how they are related
Fundamentals of Networking and Data Communications, Sixth Edition
Copyright ©2011 Cengage Learning. All rights reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible web site, in whole or in part.

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Objectives (continued)
• Outline the basic characteristics of transmitting analog data with analog signals, digital data with digital signals, digital data with analog signals, and analog data with digital signals • List and draw diagrams of the basic digital encoding techniques, and explain the advantages and disadvantages of each • Identify the different shift keying (modulation) techniques, and describe their advantages, disadvantages, and uses
Fundamentals of Networking and Data Communications, Sixth Edition
Copyright ©2011 Cengage Learning. All rights reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible web site, in whole or in part.

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Objectives (continued)
• Identify the two most common digitization techniques, and describe their advantages and disadvantages • Identify the different data codes and how they are used in communication systems

Fundamentals of Networking and Data Communications, Sixth Edition
Copyright ©2011 Cengage Learning. All rights reserved. May not be scanned, copied or duplicated, or posted to a