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Computer networks

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There are 10 stations in a LAN always having constant load, ready to transmit. During any particular contention slot, each station transmits with a probability 0.1. If the average frame takes 122ms to transmit, what is the channel efficiency, if the round trip time is 51.2 micro seconds?

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P = 10(0.1)*(1-0.1)(10-1)  

P = 0.3874
contention period is 2*tp*P = RTT*P = 51.2*0.3874 = 19.83488
EFF = 122/(122 + (51.2/2)+ 19.83488) =72.86%
 

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