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Multiplexing• Enable two or more transmission sources to  share a common circuit• Most common forms – FDM and TDM• FDM – a...
Multiplexing               2
Frequency Division Multiplexing• FDM• Each signal is modulated to a different carrier  frequency• Carrier frequencies sepa...
Frequency Division MultiplexingDiagram                              4
Wavelength DivisionMultiplexing• Multiple beams of light at different frequency• Carried by optical fiber• A form of FDM• ...
WDM Operation• Same general architecture as other FDM• Number of sources generating laser beams at  different frequencies•...
Synchronous Time DivisionMultiplexing• Multiple digital signals interleaved in time• May interleave bits, so not necessari...
Time Division Multiplexing                             8
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2 multiplexing

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Transcript of "2 multiplexing"

  1. 1. Multiplexing• Enable two or more transmission sources to share a common circuit• Most common forms – FDM and TDM• FDM – associated with analog signal, simultaneous transmission• TDM – associated with digital signal (could also be analog, but single frequency) with time slices 1
  2. 2. Multiplexing 2
  3. 3. Frequency Division Multiplexing• FDM• Each signal is modulated to a different carrier frequency• Carrier frequencies separated so signals do not overlap (guard bands)• e.g. broadcast radio• Channel allocated even if no data• Broadband 3
  4. 4. Frequency Division MultiplexingDiagram 4
  5. 5. Wavelength DivisionMultiplexing• Multiple beams of light at different frequency• Carried by optical fiber• A form of FDM• Each colour of light (wavelength) carries separate data channel 5
  6. 6. WDM Operation• Same general architecture as other FDM• Number of sources generating laser beams at different frequencies• Multiplexer consolidates sources for transmission over single fiber• Optical amplifiers amplify all wavelengths —Typically tens of km apart• Demux separates channels at the destination 6
  7. 7. Synchronous Time DivisionMultiplexing• Multiple digital signals interleaved in time• May interleave bits, so not necessarily synchronous transmission• Time slots pre-assigned to sources and fixed• Time slots allocated even if no data• Time slots do not have to be evenly distributed amongst sources 7
  8. 8. Time Division Multiplexing 8
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