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Assume 10 Mbps Ethernet and two stations A and B on it’s same segment. The RTT between two nodes is 650 bit times. A and B start transmitting frame and collision occurs and both sends 30-bit jam signal. Find the time at which both nodes A and B sense an idle channel (in μsec).

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225 bit to go from A to B.
let just before B der is collision. 50 bit jamming signal. so it will take 225+50 bit to reach A.
 
Total time = 225 + 50 + 225 = 500 bit time.
Time in second = 500/10M = 50 micro second

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