Multiple choice

___________ encoding has/have a transmission at the beginning of each 0 bit.

  1. RZ

  2. Manchester

  3. Differential

  4. All of the above
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A Correct answer
Explanation

Return-to-Zero (RZ) encoding has a transmission (signal transition) at the beginning of each bit period. In unipolar RZ, the signal returns to zero halfway through the bit period for binary 1. This creates a transition at both the start and middle of 1 bits, and at the start of 0 bits (from the previous state). RZ requires more bandwidth than NRZ but provides better clock recovery.

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