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Lecture21_2up - ECE-547 Introduction to Computer...

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1 Purdue University ECE ECE- 547 547 Introduction to Computer Introduction to Computer Communication Networks Communication Networks Instructor: Instructor: Xiaojun Xiaojun Lin Lin Lecture Lecture 21 21 Purdue University Optimal packet length Optimal packet length ¾ Packet length: l + l’ where l’ = header Packet length ¾ Assume P b = bit error probability is independent from bit to bit ¾ The larger the value of l, the higher the probability of that frame is in error ¾ The larger the value of l, the less the overhead
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