Chapert 6 Notes - Chapter 6 Bandwidth utilization is the...

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Chapter 6 Bandwidth utilization is the wise use of available bandwidth to achieve specific goals Whenever the bandwidth of a medium linking two devices is greater than the bandwidth needs of the devices, the link can be shared. Multiplexing is the set of techniques that allows the simultaneous transmission of multiple signals across a single data link. As data and telecommunications use increases, so does traffic. FDM is an analog multiplexing technique that combines analog signals WDM is an analog multiplexing technique to combine optical signals TDM is a digital multiplexing technique for combining several low-rate channels into one high-rate one In synchronous TDM, the data rate of the link is n times faster and the unit duration is n times shorter In spread spectrum, we combine signlas from different sources to fit into a larger bandwidth, but our goals are to prevent eavesdropping and jamming. To achieve these goals, spread spectrum techniques add redundancy. *Multiplexing is the simultaneous transmission of multiple signals across a single data link. * Frequency-division multiplexing (FDM) and wave-division multiplexing (WDM) are techniques for analog signals, while time-division multiplexing (TDM) is for digital signals. * In FDM, each signal modulates a different carrier frequency. The modulated carriers are combined to form a new signal that is then sent across the link. * In FDM, multiplexers modulate and combine signals while demultiplexers decompose and demodulate. * In FDM, guard bands keep the modulated signals from overlapping and interfering with one another. * Telephone companies use FDM to combine voice channels into successively larger groups for more efficient
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This note was uploaded on 10/05/2010 for the course CNT CNT 3004 taught by Professor K during the Spring '10 term at University of Central Florida.

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Chapert 6 Notes - Chapter 6 Bandwidth utilization is the...

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