Computer Networks - Physical and Data Link Layer
Consider this simple digital signal sequence:
1011001. How many times does the signal change value?Consider this simple digital signal sequence: 1011001. How many times does the signal change value?
medium📝 Analysis Q13 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze the signal sequence changes
Look at each pair of adjacent bits: 1 to 0 (change), 0 to 1 (change), 1 to 1 (no change), 1 to 0 (change), 0 to 0 (no change), 0 to 1 (change).Step 2: Count the total changes
Changes occur at positions: 1->0, 0->1, 1->0, 0->1, totaling 4 changes. Rechecking carefully: sequence is 1 0 1 1 0 0 1. Changes: 1->0 (1), 0->1 (2), 1->1 (no), 1->0 (3), 0->0 (no), 0->1 (4). So total 4 changes.Final Answer:
4 times -> Option DQuick Check:
Count bit flips = 4 [OK]
Quick Trick: Count how many times bits flip from 0 to 1 or 1 to 0 [OK]
Common Mistakes:
MISTAKES- Counting repeated bits as changes
- Missing last bit change
- Confusing total bits with changes
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