Which of the following statements are true? A. Frequency division multiplexing…
2021
Which of the following statements are true?
A. Frequency division multiplexing technique can be handled by digital circuits.
B. Time division multiplexing technique can be handled by analog circuits
C. Wavelength division multiplexing technique is used with optical fiber for combining two signals.
D. Frequency division multiplexing technique can be applied when the bandwidth of a link is greater than the bandwidth of the signals to be transmitted.
Choose the correct answer from the options given below:
- A.
B and D only
- B.
C and D only
- C.
A and D only
- D.
B and D only
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Correct answer: B
Answer: "C and D only" are correct.
Wavelength division multiplexing is used with optical fiber to combine signals by assigning each signal a different wavelength (color) of light; this is the standard method for multiplexing in fiber-optic systems.
Frequency division multiplexing can be applied when the link bandwidth is greater than the bandwidths of the signals to be transmitted, because FDM assigns separate frequency bands (plus guard bands) to each signal within the link's available spectrum.
Frequency division multiplexing being handled by digital circuits is false as stated: FDM is fundamentally an analog frequency-based technique that uses analog modulation and filtering. While digital signal processing can emulate or assist FDM functions, the statement as given is misleading.
Time division multiplexing being handled by analog circuits is false in typical usage: TDM normally refers to allocating discrete time slots (a digital concept). Although analog implementations that interleave sampled analog signals exist historically, the conventional understanding of TDM is digital.
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