WK 3 research 08-Multiplexing

WK 3 research 08-Multiplexing - Data and Computer...

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Click to edit Master subtitle style Data and Computer Communications Eighth Edition by William Stallings Lecture slides by Lawrie Brown Chapter 8 – Multiplexing
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Multiplexing It was impossible to get a conversation going, everybody was talking too much. Ø Yogi Berra
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Multiplexing Ø multiple links on 1 physical line Ø common on long-haul, high capacity, links Ø have FDM, TDM, STDM alternatives
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Frequency Division Multiplexing
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FDM System Overview
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FDM Voiceband Example
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Analog Carrier Systems Ø long-distance links use an FDM hierarchy Ø Ø Group l 12 voice channels (4kHz each) = 48kHz l in range 60kHz to 108kHz Ø Supergroup l FDM of 5 group signals supports 60 channels l on carriers between 420kHz and 612 kHz Ø Mastergroup l FDM of 10 supergroups supports 600 channels Ø so original signal can be modulated many times
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Wavelength Division Multiplexing Ø FDM with multiple beams of light at different freq Ø carried over optical fiber links l commercial systems with 160 channels of 10 Gbps l lab demo of 256 channels 39.8 Gbps Ø architecture similar to other FDM systems l multiplexer consolidates laser sources (1550nm) for transmission over single fiber l Optical amplifiers amplify all wavelengths l Demux separates channels at the destination Ø also have Dense Wavelength Division Multiplexing (DWDM)
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Synchronous Time Division Multiplexing
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TDM System Overview
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WK 3 research 08-Multiplexing - Data and Computer...

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