Question

Explain the three modes of communication: Simplex, Half Duplex, and Full Duplex.

Hint:

Remember: {S-H-F} → Simplex (1-way), Half Duplex (2-way alternate), Full Duplex (2-way simultaneous).

Answer 1

Concept: Communication modes describe how data flows between two devices in a network. They are classified based on direction and simultaneity of data transmission.
Step 1: Simplex Mode.

• Data flows in only one direction.
• One device sends, the other only receives.
• No feedback or reverse communication.
• Examples: Keyboard to computer, radio broadcasting.

Step 2: Half Duplex Mode.

• Data flows in both directions, but not at the same time.
• Devices take turns sending data.
• Communication is two-way but alternating.
• Example: Walkie-talkies.

Step 3: Full Duplex Mode.

• Data flows in both directions simultaneously.
• Both devices can send and receive at the same time.
• Faster and more efficient communication.
• Examples: Telephone calls, video calls.

Step 4: Comparison.
\[ \text{Simplex} \rightarrow \text{One-way communication} \] \[ \text{Half Duplex} \rightarrow \text{Two-way, but one at a time} \] \[ \text{Full Duplex} \rightarrow \text{Two-way simultaneous communication} \] Conclusion:
The three modes differ based on direction and timing of data flow, with Full Duplex being the most efficient.