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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