In a token-ring network, the transmission speed is 107 bps and the propagation…
2024
In a token-ring network, the transmission speed is 107 bps and the propagation speed is 200 m/μs. The distance equivalent to a 1-bit delay is:
Answer: A. 20 m — ConceptA one-bit delay is the physical length occupied by one bit while its signal propagates through the medium. For bit rate R and propagation speed v, bit…
- A.
20 m
- B.
30 m
- C.
50 m
- D.
40 m
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Show answer & explanation
Correct answer: A
Concept
A one-bit delay is the physical length occupied by one bit while its signal propagates through the medium.
For bit rate R and propagation speed v, bit time is T = 1/R and the equivalent length is L = vT.
Application
Compute the bit time: T = 1/(107 bits/s) = 10−7 s = 0.1 μs.
Multiply by propagation speed: L = (200 m/μs)(0.1 μs) = 20 m.
Cross-check
A 20 m span at 200 m/μs has propagation time 20/200 μs = 0.1 μs, exactly one bit time at 107 bps.
Result
The distance equivalent to the 1-bit delay is 20 m.