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1 multiplexing 1 multiplexing Presentation Transcript

  • Unit -3 MultiplexingWCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
  • Figure 8-1 Multiplexing vs. No MultiplexingWCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
  • 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) with time slices 3
  • Multiplexing 4
  • Frequency Division Multiplexing• Each signal is modulated to a different carrier frequency• Carrier frequencies separated so signals do not overlap (guard bands)• Channel allocated even if no data 6
  • Frequency Division Multiplexing Diagram 7
  • Figure 8-3 FDMWCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
  • Figure 8-5 Multiplexing, Frequency DomainWCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
  • Figure 8-7 Demultiplexing, Frequency DomainWCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
  • Figure 8-4 FDM, Time DomainWCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
  • Figure 8-6 Demultiplexing, Time DomainWCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
  • TDM
  • Synchronous Time Division Multiplexing• 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 14
  • Time Division Multiplexing 15
  • Figure 8-9 Synchronous TDMWCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
  • TDM, Multiplexing
  • Figure 8-11 TDM, DemultiplexingWCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
  • Framing Bits
  • Figure 8-13 Data RateWCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
  • Figure 8-14 Asynchronous TDMWCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
  • Figure 8-15 Frames and Addresses a. Only three lines sending dataWCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
  • Figure 8-15-continued Frames and Addresses b. Only four lines sending dataWCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
  • Figure 8-15-continued Frames and Addresses c. All five lines sending dataWCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
  • Wavelength Division Multiplexing• Multiple beams of light at different frequency• Carried by optical fiber• A form of FDM• Each colour of light (wavelength) carries separate data channel 25
  • 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 26
  • Figure 8-16 WDM - Wavelength Division MultiplexingWCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
  • Figure 8-16 WDM - Wavelength Division MultiplexingWCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
  • WDM - Wavelength Division Multiplexing