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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Chapter Three Data Communication Concepts
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl A typical communication link between two LANs Figure 3.1
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl The periodic sine wave is a fundamental analog signal Figure 3.2
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Concept of phase shifts relative to time zero Figure 3.3
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Amplitude, period, and bit duration of two binary waveforms Figure 3.4
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Amplifiers compensate for energy losses along a channel Figure 3.5
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Electrical or optical power levels of a signal at points 1 and 2 Figure 3.6
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Attenuation and amplification in a transmission path Figure 3.7
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Analog and digital signal representations Figure 3.8
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Digitization of analog waveforms Figure 3.9
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Typical AM, FM, and PM waveforms Figure 3.10
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Constellation or phase-state diagrams for QPSK and 8-PSK Figure 3.11
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Two possible constellations for 16-QAM Figure 3.12
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Examples of several commonly used line codes Figure 3.13
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Measurement of the length of an error burst Figure 3.14
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl The basic procedure for the CRC technique Figure 3.15
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Two different procedures for finding the CRC Figure 3.16
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Example of the stop-and-wait flow control method Figure 3.17
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Concept of the sliding-window protocol operation Figure 3.18
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Example of frame retransmission using go-back-N ARQ Figure 3.19
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Structure of an optical fiber waveguide Figure 3.20
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Comparison of single-mode and multimode optical fibers Figure 3.21
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Example of communication devices sharing a wireless LAN Figure 3.22
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl The fundamental concept of multiplexing Figure 3.23
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl In the FDM process guard bands separate adjacent channels Figure 3.24
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Synchronous time division multiplexing (TDM) Figure 3.25
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl The concept of statistical TDM Figure 3.26
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Example of statistical TDM Figure 3.27
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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl The concept of WDM based on the ITU-T G.692 grid Figure 3.28
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