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A group of N stations share a 56-kbps pure ALOHA channel. Each station outputs a 1000-bit frame on an average of once every 100 secs, even if the previous one has not yet been sent (stations are buffered). What is the maximum value of N?

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In ALOHA mode, the maximum efficiency (or fraction of usable bandwidth) is given
1/(2.e) = 0.184

An analysis of the random access method of transmitting packets
in a pure ALOHA channel shows that the ...

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