BDC4e Chapter 10 - Chapter 10: Transmission Efficiency...

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Chapter 10: Transmission Efficiency Business Data Communications, 4e
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Transmission Efficiency: Multiplexing Several data sources share a common transmission medium simultaneously Line sharing saves transmission costs Higher data rates mean more cost-effective transmissions Takes advantage of the fact that most individual data sources require relatively low data rates
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Multiplexing Diagram
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Alternate Approaches to Terminal Support Direct point-to-point links Multidrop line Multiplexer Integrated MUX function in host
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Direct Point-to-Point
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Multidrop Line
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Multiplexer
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Integrated MUX in Host
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Frequency Division Multiplexing Total bandwidth = sum of input bandwidths + guardbands Modulates signals so that each occupies a different frequency band Standard for radio broadcasting, analog telephone network, and television (broadcast, cable, & satellite)
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FDM Example: ADSL ADSL uses frequency-division modulation (FDM) to exploit the 1-MHz capacity of twisted pair. There are three elements of the ADSL
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BDC4e Chapter 10 - Chapter 10: Transmission Efficiency...

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