networking Multiplexing and demultiplexing

1. Multiplexing
Set of techniques that allows the
simultaneous transmission of multiple
signals across a single data link

2. Multiplexing

3. Frequency Division
Multiplexing

4. FDM Multiplexing
Time Domain

5. FDM Multiplexing
Frequency Domain

6. FDM Demultiplexing
Time Domain

7. Time Division Multiplexing
 Portions of signals occupy the link
sequentially
 Synchronous TDM and asynchronous
TDM

8. Time Division Multiplexing

9. Synchronous TDM
 Multiplexer allocates exactly the
same time slot to each device at all
times
 Time slots are grouped into frames
– For n input lines, each frame has at
least n slots
– It is possible to accommodate varying
data rates

10. Synchronous TDM

11. Interleaving
 Interleaving can be done by bit, by byte,
or by any other data unit
 The interleaved unit is of the same size
in a given system

12. Interleaving

13. Demultiplexing Process
 Demultiplexer decomposes each
frame by extracting each data unit in
turn
 Weakness of synchronous TDM
–Waste of empty slots

14. Demultiplexing Process