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Network Delays, Statistical Multiplexing

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.

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Network Delays, Statistical Multiplexing

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

  2. 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

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

  4. 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…” 

  5. Animation from class Data Rate 1 Time Data Rate 2 Capacity Time Data Rate 3 Time

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

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

  8. Why and when will this work? Zone #2 Zone #1 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

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