GATE | Gate IT 2007 | Question 73

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 = 5 ms, tp = 3 ms, N = 15 is :
(A) 0.545
(B) 0.655
(C) 0.9375
(D) 0.961


Answer: (D)

Explanation: Maximum efficiency of token ring = (tt)/(tt +( tp/n))
tt= 5 ms
tt =3 ms and n=15,
efficiency = (5)/(5+3/15) = 5/5.2 = .961


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