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Assume there are 50 nodes are connected to a 1 km length of the coaxial cable. Using some protocol, each node can transmit 50 frames/second, where the average frame length is 3000 bits. The transmission rate at each node is 100 Mbps. The percentage efficiency of this protocol is ________.
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Is it 7.5 % ?
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@shashin

yes, I think so.

Here length of cable not required, right??

So, $\frac{50\times 50\times 3000}{100\times 10^{6}}\times 100=7.5$