Summary

• I implemented a process model for data forwarding function of VirtualClock using OPNET simulation tool.

• The functionality of the model is verified in a simple network scenario.

• VirtualClock was used in two complex simulation scenarios and was compared with three scheduling algorithms: WFQ, CQ, and PQ.

• Simulations results show:

  • VC performs closely to WFQ and CQ during both conforming and non-conforming time intervals.
  • VC, WFQ, and CQ have similar effect on HTTP, FTP, IP Telephony, and videoconferencing Internet applications.

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