Network Delays, Statistical Multiplexing

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Presentation transcript:

Network Delays, Statistical Multiplexing EE 122 Discussion 9/12/11

Transmission and Propagation Delay Host 1 Switch 1 Propagation delay between Host 1 and Switch1 Speed of light Physical distance Transmission delay Size of transfer Bandwidth of link

Queuing Delay (Problem #3) C Transmission delay doubles Brown packet waits for half the trans. delay of blue packet

Statistical Multiplexing Over-subscribe “peak” requirements of flows and hope that “average” requirements are under capacity “Hope is a good thing, maybe the best of things…” 

Animation from class Data Rate 1 Time Data Rate 2 Capacity Time

Animation from class Data Rate 1 Time Data Rate 2 Capacity / 3

Animation from class Time Below capacity of link all the time! Time

Why and when will this work? Zone #1 Zone #2 Zone #3 Probability of a flow transmitting in each time zone is 1/3 What is the expected value of the overall flow? Time Time Time