Multiplexing & DE Multiplexing( Time Division Multiplexing(TDM) & Frequency Division Multiplexing(FDM))
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Time Division Multiplexing (TDM) and Frequency Division Multiplexing (FDM) are techniques that enable the simultaneous transmission of multiple signals over a single data link, providing cost savings and efficient bandwidth utilization. FDM modulates each signal to a different carrier frequency to prevent overlapping, with applications such as broadcast radio. Wavelength-Division Multiplexing (WDM) is a similar technique used to combine optical signals.
Multiplexing & DE Multiplexing( Time Division Multiplexing(TDM) & Frequency Division Multiplexing(FDM))
- 1. TIME DIVISION MULTIPLEXING (TDM) AND FREQUENCY DIVISION MULTIPLEXING (FDM)
- 2. Fig. 10-1: Concept of multiplexing
- 3. Transmitting two or more signals simultaneously can be accomplished by setting up one transmitter-receiver pair for each channel, but this is an expensive approach. A single cable or radio link can handle multiple signals simultaneously using a technique known as multiplexing. Multiplexing permits hundreds or even thousands of signals to be combined and transmitted over a single medium. Cost savings can be gained by using a Multiplexing and DE multiplexing
- 4. 6.4 Bandwidth utilization is the wise use of available bandwidth to achieve specific goals. Efficiency can be achieved by multiplexing; i.e., sharing of the bandwidth between multiple users. Note
- 5. 6.5 6-1 MULTIPLEXING Whenever the bandwidth of a medium linking two devices is greater than the bandwidth needs of the devices, the link can be shared. Multiplexing is the set of techniques that allows the (simultaneous) transmission of multiple signals across a single data link. As data and telecommunications use increases, so does traffic. Frequency-Division Multiplexing Wavelength-Division Multiplexing Synchronous Time-Division Multiplexing Statistical Time-Division Multiplexing Topics discussed in this section:
- 8. 6.8 Figure 6.3 Frequency-division multiplexing (FDM)
- 9. FREQUENCY DIVISION MULTIPLEXING • Useful bandwidth of medium exceeds required bandwidth of channel • 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
- 12. 6.12 Figure 6.4 FDM process
- 13. 6.13 Figure 6.5 FDM DE multiplexing example
- 14. 6.14 Figure 6.6 Example 6.1
- 20. 6.20 WDM is an analog multiplexing technique to combine optical signals. Note
- 21. 6.21 Figure 6.10 Wavelength-division multiplexing (WDM)
- 22. 6.22 Figure 6.11 Prisms in wavelength-division multiplexing and DE multiplexing