ACtE08 · Chapter 8Demo · Set 4🏛️ Past Licensure QuestionID: 4e4cdd83
Which of the following is NOT an error detection or error correction technique in digital communications?
Which of the following is NOT an error detection or error correction technique in digital communications?
Multiple Choice Options
- A
Parity Check
- B
Checksum
- C
Hamming Code
- D✓ Correct Option
Multiplexing
Detailed Technical Solution & Explanation
In data communications:
•
Parity Check: Simple single-bit error detection mechanism adding an extra bit to make total 1s even or odd.
•
Checksum: Error detection technique where segments of data words are summed using 1's complement arithmetic.
•
Hamming Code: Forward error-correcting code using redundant parity bits at powers of 2 to detect up to two simultaneous bit errors or correct single-bit errors.
•
Multiplexing: A transmission resource-sharing technique that combines multiple independent data streams or channels into a single composite physical channel (e.g., TDM, FDM, WDM). It does not detect transmission bit errors.
Option Analysis:
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Option A (Parity Check): Valid error detection technique.
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Option B (Checksum): Valid error detection technique.
•
Option C (Hamming Code): Valid error detection and correction technique.
•
Option D (Multiplexing): Correct; multiplexing is a medium-sharing channel management technique, not an error detection mechanism.
Reference: Demo · Set 4NEC Licensure Syllabus