Multiplexing <ul><li>Many to one/one to many </li></ul><ul><li>Types of multiplexing </li></ul>WCB/McGraw-Hill    The McG...
Multiplexing <ul><li>Multiplexing is the set of techniques that allows the simultaneous transmission of multiple signals a...
WCB/McGraw-Hill    The McGraw-Hill Companies, Inc., 1998 Multiplexing vs. No Multiplexing
WCB/McGraw-Hill    The McGraw-Hill Companies, Inc., 1998
FDM WCB/McGraw-Hill    The McGraw-Hill Companies, Inc., 1998
FDM WCB/McGraw-Hill    The McGraw-Hill Companies, Inc., 1998
FDM <ul><li>FDM is an analog technique that can be applied when the bandwidth of a link is greater than the combined bandw...
Multiplexing process <ul><li>Each source generates a signal of  a similar frequency range. </li></ul><ul><li>Inside a MUX,...
WCB/McGraw-Hill    The McGraw-Hill Companies, Inc., 1998 FDM, Time Domain
WCB/McGraw-Hill    The McGraw-Hill Companies, Inc., 1998 Multiplexing, Frequency Domain
Demultiplexing process <ul><li>The demultiplexer uses a series of filters to decompose the multiplexed signals into its co...
WCB/McGraw-Hill    The McGraw-Hill Companies, Inc., 1998 Demultiplexing, Time Domain
WCB/McGraw-Hill    The McGraw-Hill Companies, Inc., 1998 Demultiplexing, Frequency Domain
TDM WCB/McGraw-Hill    The McGraw-Hill Companies, Inc., 1998
TDM <ul><li>TDM is a digital multiplexing technique for combining several low rate channels into one high rate one. </li><...
Synchronous TDM <ul><li>In this the data flow is divided into units where each input connection is divided into units wher...
Synchronous TDM WCB/McGraw-Hill    The McGraw-Hill Companies, Inc., 1998
WCB/McGraw-Hill    The McGraw-Hill Companies, Inc., 1998 TDM, Multiplexing
Figure 8-11 WCB/McGraw-Hill    The McGraw-Hill Companies, Inc., 1998 TDM, Demultiplexing
Framing Bits WCB/McGraw-Hill    The McGraw-Hill Companies, Inc., 1998
Asynchronous TDM <ul><li>In this  TDM slots are dynamically allotted to improve bandwidth efficiency. </li></ul><ul><li>Mu...
Asynchronous TDM WCB/McGraw-Hill    The McGraw-Hill Companies, Inc., 1998
Frames and Addresses WCB/McGraw-Hill    The McGraw-Hill Companies, Inc., 1998 a. Only three lines sending data
Frames and Addresses b. Only four lines sending data
Frames and Addresses WCB/McGraw-Hill    The McGraw-Hill Companies, Inc., 1998 c. All five lines sending data
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Ch08 1

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Ch08 1

  1. 1. Multiplexing <ul><li>Many to one/one to many </li></ul><ul><li>Types of multiplexing </li></ul>WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998
  2. 2. Multiplexing <ul><li>Multiplexing is the set of techniques that allows the simultaneous transmission of multiple signals across a single data link i.e. Dividing link into channels </li></ul>WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998
  3. 3. WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Multiplexing vs. No Multiplexing
  4. 4. WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998
  5. 5. FDM WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998
  6. 6. FDM WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998
  7. 7. FDM <ul><li>FDM is an analog technique that can be applied when the bandwidth of a link is greater than the combined bandwidth of the signals to be transmitted. </li></ul><ul><li>Channels can be separated by strips of unused bandwidth guard bands to prevent signals from overlapping. </li></ul><ul><li>Applications: Telephone System, AM& FM radio broadcasting, TV Broadcasting </li></ul>WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998
  8. 8. Multiplexing process <ul><li>Each source generates a signal of a similar frequency range. </li></ul><ul><li>Inside a MUX, these similar signals modulates different carrier frequencies </li></ul><ul><li>The resulting modulated signals are the combined into a single composite signals that is sent over a media link </li></ul>
  9. 9. WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 FDM, Time Domain
  10. 10. WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Multiplexing, Frequency Domain
  11. 11. Demultiplexing process <ul><li>The demultiplexer uses a series of filters to decompose the multiplexed signals into its constituent signals. </li></ul><ul><li>The individual signals are then passed to a demodulator that separates them from their carriers and passes them to the output lines </li></ul>
  12. 12. WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Demultiplexing, Time Domain
  13. 13. WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Demultiplexing, Frequency Domain
  14. 14. TDM WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998
  15. 15. TDM <ul><li>TDM is a digital multiplexing technique for combining several low rate channels into one high rate one. </li></ul><ul><li>It is a digital process which allows several connections to share the high bandwidth of a link. </li></ul><ul><li>Instead of sharing a portion of the BW as in FDM, time is shared </li></ul>WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998
  16. 16. Synchronous TDM <ul><li>In this the data flow is divided into units where each input connection is divided into units where each input occupies one input time slot. A unit can be 1 bit, I character or 1 block of data </li></ul><ul><li>If the input time slot is Ts then o/p time slot will be T/n where n is no of connections </li></ul><ul><li>TDM can be visualized as two fast rotating switches, one on the multiplexing side another on demultiplexing side </li></ul>
  17. 17. Synchronous TDM WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998
  18. 18. WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 TDM, Multiplexing
  19. 19. Figure 8-11 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 TDM, Demultiplexing
  20. 20. Framing Bits WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998
  21. 21. Asynchronous TDM <ul><li>In this TDM slots are dynamically allotted to improve bandwidth efficiency. </li></ul><ul><li>Multiplexer checks each input in round robin fashion. It allocates a slot for input line if the line has data to send, otherwise it skip the data and check the next time. </li></ul><ul><li>Addressing: In asynchronous multiplexing there is no fixed relationship between input & output. </li></ul><ul><li>We need to include the address of the receiver inside each slot to show where it is to be delivered. </li></ul><ul><li>The addressing can be n bits to define N different output lines with n =log 2 N </li></ul>
  22. 22. Asynchronous TDM WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998
  23. 23. Frames and Addresses WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 a. Only three lines sending data
  24. 24. Frames and Addresses b. Only four lines sending data
  25. 25. Frames and Addresses WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 c. All five lines sending data
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