Multiplexing and demultiplexing

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 ninput lines, each frame has at
least nslots
–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