200-301 Question 491
Single answerA network administrator is troubleshooting data transmission over a serial link between two routers. The administrator observes that the signal waveforms are not being interpreted correctly on the receiving side. Which data encoding method could help ensure better synchronization by embedding clocking information into the signal?
- A
Non-Return-to-Zero (NRZ)
- B
Manchester Encoding
- C
Pulse-Amplitude Modulation (PAM)
- D
Frequency Modulation (FM)
Show answer and explanation
Correct answer: B
Explanation
Manchester Encoding is a robust method for ensuring synchronization in digital communication, as it embeds clocking information by introducing a transition in the middle of each bit period. This ensures that the receiving end can correctly interpret the timing of the bits, even in the absence of a separate clock signal.
- A. Incorrect.
Non-Return-to-Zero (NRZ) encoding does not embed clocking information into the signal, making it susceptible to synchronization issues, especially for long sequences of 0s or 1s.
- B. Correct.
Manchester Encoding embeds clocking information into the signal by ensuring there is always a transition in the middle of each bit period, facilitating better synchronization.
- C. Incorrect.
Pulse-Amplitude Modulation (PAM) is a modulation technique that varies the amplitude of pulses to encode data but does not inherently embed clocking information.
- D. Incorrect.
Frequency Modulation (FM) is used to encode data by varying the frequency of the carrier wave; however, it is not commonly used to resolve clock synchronization issues in digital data transmission.