2×2 Packet Switch SimulationContents PageAim 1. 2 MethodologyObjectivesBackgroundPerformance Evalua ...

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2×2 Packet Switch Simulation

Contents Page

1. Aim 1. 2 Methodology
2. Objectives
3. Background
4. Performance Evaluation
5. Measurement
6. Analysis/Simulation
7. Packet Switched Networks
8. Introduction
9. Theory
10. Queuing Theory
11. Queuing Model
12. Concept of a queuing model
13. Queuing theory notation
14. The M/M/1 Queue
15. The M/D/1 Queue
16. Switching
17. Switching Concept
18. Internal Link Blocking
19. Output Port Contention
20. Head Of Line Blocking
21. Time Between Arrivals
22. Counting Arrivals
23. The Queuing Behaviour Of Packets In Output Buffers
24. Calculating The State Probability Distribution
25. Analytical /Simulation Results
26. 2×2 Switch
27. Analytical Results
28. Simulation Results
29. 4×4 Switch
30. Analytical Results
31. Simulation Results
32. 8×8 Switch
33. Analytical Results
34. Simulation Results
35. 16×16 Switch
36. Analytical Results
37. Simulation Results
38. Conclusion
39. Project Management
40. Risk Analysis
41. Gant Chart
42. References

Interim report 2×2

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Packet Switch Simulation Using Matlab

Test out a simulation on fundamental 2×2 switch element. Then expand it. Learn about Matlab. Learn about simulation.  Build a simple test model and try it. Build a 2×2 element in Matlab.  Simulate any new results required? Write a report. When networks are designed, the goal of the performance evaluation is to determine the best effect of the equipment sed. Methods for performance evaluation are measurement techniques, analysis, and simulation.  Measurement For measurement methods real networks is used for experimentation. The advantage of direct measurement of network performance is that no detail of network operation is excluded but experience hard to test performance limits. Customers won’t like it when you crash the system.

Analysis/ Simulation

In comparing analysis and simulation, the main factors to consider are the accuracy of results, the time to produce results, and the overall cost of using the method. The advantage of analytical solutions is that they are quite a good fit for reality and produces results quickly. However, assumptions required to define equations and parameters and they can be very complex. Simulation provides system representation to the required precision. However, simulation can be time and cost demands. In a packet-switched network, all nodes interconnected by directed links. Packets are routed independently. Packets enter the network at a specific node where they may be queued in a buffer to wait for an outgoing channel to become free. This continued in a hop by hop manner until the packets finally arrive at their destination. Packets may arrive at the same destination by taking different routes. That increases the efficiency of transmission resources. Also queued packets in the buffer will cause a variable delay and throughput, depending on traffic load. Basic network is shown in figure 1.

Figure 1: Packet Switched Network 3.

Introduction

Contention in a switch affects the performance of a switch. To prevent this some switching techniques are developed. One of the most common switching techniques is the one with an output-buffered switch. In this report, the queuing process of performance evaluation, for such a switch is done analytically first than simulation analysis is done using Matlab. At the end of the report comparison of the two results is done.

Theory

Queuing Theory Analysis of the queuing process is basic and essential part of the performance evaluation. Because queues are formed in a network when there is a high demand for limited resources.  Queuing Model Packets arrive at a queuing system to be served for a certain time. If service is not immediately available they wait for service in a storage area (buffer). After a certain length of time, they are served and leave the system. The basic queuing system is shown in the figure.

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