11: Which multiplexing technique used to transmit digital signals?FDMTDMWDMFDM & WDMC

Step 1: Break Down the Problem

To determine which multiplexing technique is used to transmit digital signals, we need to analyze the available options: FDMA, TDMA, WDMA, FDM, and WDM.

Step 2: Relevant Concepts

1. FDMA (Frequency Division Multiple Access): This technique divides the frequency spectrum into separate channels. It is primarily used in analog signal transmission.
2. TDMA (Time Division Multiple Access): This technique allocates different time slots for different signals. It is commonly used for digital transmissions.
3. FDM (Frequency Division Multiplexing): Similar to FDMA, it is used for analog signals and divides the frequency spectrum for different signals.
4. WDM (Wavelength Division Multiplexing): This is used for optical signals and divides different wavelengths for transmission, usually not for pure digital transmission.
5. WDMF (Wavelength Division Multiplexing for Fiber): A variation of WDM, primarily for fiber optics.

Step 3: Analysis and Detail

• FDMA, FDM, and WDM are primarily used for analog signals or optical communication.
• TDMA is specifically designed for digital communications, making it suitable for transmitting digital signals.
• WDMA does not refer to a standard multiplexing technique used for digital transmission.

Step 4: Verify and Summarize

TDMA is a widely recognized technique for digital signal transmission. The analysis shows that among the options given, TDMA is the only multiplexing technique specifically designed for transmitting digital signals.

Final Answer

The multiplexing technique used to transmit digital signals is TDMA (Time Division Multiple Access).