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VoIP

Designing the Routers and phones to meet quality and performance metrics

Voice over IP Telephone Network

Evaluating the response time and the audio quality acoss the Internet. Each device is modeled as a network node and processing capacity.

Browsable image of the model.

  • To download OpenWebStart click on the links –
    Windows– Compatibility:Windows 10 or higher (*)
    macOS – Compatibility:macOS 10.15 (Catalina) or higher (*)
    Linux – Compatibility:Ubuntu 18.04 LTS or higher (*)
Launch
  • Mouse over the icons to view parameters. Click on hierarchy and plotters to reveal content (if provided).
  • To simulate, click on Launch button, open downloaded file and click Run on the Java Security Page.

In this model each node is separated by a distance and is connected via Routers and VoIP Gateways. The Operator is represented as a Traffic Generator block
that generates a packet at a fixed rate called “Packet Rate”. Packet Rate is configured to 5.0e-5, 20.0e-5 and 30.0e-5. The initial connection establishment
delay is a parameter.

To simulate failures, the processing units are overloaded with the application of external tasks. These tasks are high priority independent tasks
(which are not connected to the regular flow).

The processing units- IP_Phone1, IP_Phone2 and the CPU are overloaded by enabling the Enable_Load parameter. The new overloading tasks steal
processing cycles that were previously available for VoIP.

    • The external task for IP_Phone1 is triggered every 90us and each task takes 1000 processing cycles.

 

    For a SystemResource running at 166MHz, a 1000 cycle produces a stall time of 6.02us.
    • The external task for IP_Phone2 is triggered every 90us and each task takes 1000 processing cycles.

 

    • For a SystemResource running at 166MHz, a 1000 cycle produces astall time of 6.02us.

 

    • The external task for CPU in the External_Gateway is triggered every 90us and each task takes

 

    500 processing cycles. For a SystemResource running at 166MHz, a 500 cycle produces a stall time of 3.01us.

 

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