Lecture25

Lecture25 - ECE-547 Introduction to Computer Communication...

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Purdue University ECE ECE - - 547 547 Introduction to Computer Introduction to Computer Communication Networks Communication Networks Instructor: Instructor: Xiaojun Xiaojun Lin Lin Lecture 25 Lecture 25
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Purdue University Very Heavy Load: cont. Very Heavy Load: cont. Almost linear γ μE(T) 1 slope normalized power = 2 /1 Normalized Power: = power () P ET γμ μμ Power: power ± =
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Purdue University Other Generalizations Other Generalizations ¾ Sliding Window Flow Control acknowledges every packet. ¾ Instead, can ack one packet for every m packets received ¾ Each ack acknowledges all packets that have been received so far ¾ In X.25 ¾ Note: X.25 was an interface protocol recommendation to enable data terminal equipment (DTE) to communicate with data circuit terminating equipment (DCE), which in turn was expected to provide access to a packet-switched network (See Chapters 3 & 5 in Schwartz).
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Purdue University Ack Ack - - at at - - End End - - of of - - Window Control Window Control ¾ Extreme: 1 Ack/Window (Last Ack “acks” all packets in window) ¾ Reduces number of acks and hence overhead ¾ Price paid: reduction in V.C. throughput.
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Lecture25 - ECE-547 Introduction to Computer Communication...

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