Question

Which one of the following multiplexing techniques cannot be used for analog signals?

• A. Frequency Division Multiplexing
• B. Wavelength Division Multiplexing
• C. Time Division Multiplexing
• D. All of the above

Hint:

TDM is used for digital signals, whereas FDM and WDM are suitable for analog signals. When handling analog transmission, FDM is the preferred method.

Answer 1

The Correct Option is C

Step 1: Understanding Multiplexing Techniques
Multiplexing allows multiple signals to share a single communication channel.
Step 2: Types of Multiplexing
- Frequency Division Multiplexing (FDM): Used for analog signals by allocating different frequency bands.
- Wavelength Division Multiplexing (WDM): Similar to FDM but used in optical fiber communications for different wavelengths.
- Time Division Multiplexing (TDM): Primarily used for digital signals, as it divides time into slots assigned to different signals.

Step 3: Analyzing the Correct Option
- Option (A) Frequency Division Multiplexing: Incorrect, as FDM is commonly used for analog signals.
- Option (B) Wavelength Division Multiplexing: Incorrect, since WDM is a variant of FDM used for light signals.
- Option (C) Time Division Multiplexing (Correct): TDM cannot be used for analog signals as it is designed for digital data transmission.
- Option (D) All of the above: Incorrect, as FDM and WDM support analog signals.