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BDC5eChapter15 - Chapter 15 Data Transmission Business Data...

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Chapter 15: Data Transmission Business Data Communications, 5e
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Business Data Communications, 5e 2 Electromagnetic Signals Analog Signal signal intensity varies in a smooth fashion over time. In other words, there are no breaks or discontinuities in the signal Digital Signal signal intensity maintains a constant level for some period of time and then changes to another constant level
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Business Data Communications, 5e 3 Analog Sine Wave
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Business Data Communications, 5e 4 Digital Square Wave
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Business Data Communications, 5e 5 Periodic Signal Characteristics Peak Amplitude (A) Maximum signal value, measured in volts Frequency ( f ) Repetition rate Measured in cycles per second or Hertz (Hz) Period (T) Amount of time it takes for one repetition, T=1/ f Phase ( φ ) Relative position in time, measured in degrees
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Business Data Communications, 5e 6 s ( t ) = (4/ π ) × (sin (2 π ft ) + (1/3) sin (2 π (3 f ) t ))
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Business Data Communications, 5e 7 Frequency Domain Concepts Spectrum of a signal is the range of frequencies that it contains Absolute bandwidth of a signal is the width of the spectrum
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