BDC6eChapter15(4)

BDC6eChapter15(4) - Chapter 15: Data Transmission Business...

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Chapter 15: Data Transmission Business Data Communications, 6e
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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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3 Analog and Digital Waveforms
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4 Periodic Signal Characteristics Peak Amplitude ( A ) Maximum signal value (strength), 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 () Relative position in time, measured in degrees
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5 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 Effective bandwidth contained in a relatively narrow band of frequencies, where most of signal’s energy is found The greater the bandwidth, the higher the information-carrying capacity of the signal
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BDC6eChapter15(4) - Chapter 15: Data Transmission Business...

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