Consider a token ring topology with N stations (numbered 1 to N) running token…
2007
Consider a token ring topology with N stations (numbered 1 to N) running token ring protocol where the stations are equally spaced. When a station gets the token it is allowed to send one frame of fixed size. Ring latency is tp, while the transmission time of a frame is tt. All other latencies can be neglected.
The maximum utilization of the token ring when tt =3 ms, tp = 5 ms, N = 10 is
- A.
0.545
- B.
0.6
- C.
0.857
- D.
0.961
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Correct answer: C
Formula: maximum utilization U = (total transmission time per rotation) / (total rotation time)
Total transmission time per rotation = N × t_t = 10 × 3 ms = 30 ms.
Total rotation time = (total transmission time per rotation) + ring latency = 30 ms + 5 ms = 35 ms.
Utilization U = 30 / 35 = 0.857 (≈85.7%).
Therefore the maximum utilization for the given values is 0.857.