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Module 18

Module 18. WLAN Validation. Objectives. Identify the four phases of WLAN validation Distinguish between an active site survey and a passive site survey Describe site walkabout guidelines Identify the prerequisites for a performance test

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Module 18

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  1. Module 18 WLAN Validation

  2. Objectives • Identify the four phases of WLAN validation • Distinguish between an active site survey and a passive site survey • Describe site walkabout guidelines • Identify the prerequisites for a performance test • Identify the questions answered during a performance test

  3. Phases of Validation

  4. Phases of Validation - Overview • Site survey validation • Performance testing • Spectrum analysis (*) • Security testing (*)

  5. Site Survey Validation

  6. Summary

  7. Passive Site Survey Basics • Survey instrument is a laptop or tablet • with LANPlanner/Site Scanner or an equivalent survey tool • Survey instrument measures RF energy • Survey instrument generates no WLAN traffic

  8. Passive Site Survey Basics • Load site floor plans • Mark your starting point • Enable RF sensor • Walk and mark . . . • . . . walk halls, rooms, and open spaces • Insert reference points • Save survey data

  9. Walkabout Guidelines (1 of 3)

  10. Walkabout Guidelines (2 of 3)

  11. Walkabout Guidelines (3 of 3)

  12. Active Site Survey • Measures both RF energy . . . • and a continuous data stream . . . • between an AP and the survey instrument

  13. Interpret Survey Results

  14. KEY GUIDELINE Ensure that the survey tool sampling interval is greater than the AP beacon interval

  15. Performance Testing

  16. Summary

  17. Basics • Requires both the wired and wired segments of the WLAN • Requires connectivity to application servers and network resources • Requires an instance of each client device type and model supported by the network • Requires an instance of each end-user application supported by the network

  18. Initial Checklist

  19. Application Performance Test Checklist

  20. Roaming Performance Test Guidelines • During a roaming test, duplicate the maximum roaming speeds users are likely to attain • Use a packet trace tool during roaming tests, particularly for latency-sensitivereal-time applications

  21. Load Performance Testing • Determine: Do applications meet QoS requirements when the WLAN is under a typical expected load? • Recruit end users or an extended test team to simulate site usage scenarios • Employ a centralized management system to monitor network and application performance • Interview users to discover the perceived performance of individual applications

  22. WLAN Validation – Review • Use appropriate tools (LANPlanner , SiteScanner, etc.) to validate RF performance • Be sure to use “Walkabout Guidelines” to validate quality of RF performance • Ensure site survey tool sampling interval is greater than the AP beaconing interval • During roaming test, be sure to duplicate the maximum roaming speeds users are likely to use.

  23. Identify the four phases of WLAN validation • Distinguish between an active site survey and a passive site survey • Describe site walkabout guidelines • Identify the prerequisites for a performance test • Identify the questions answered during a performance test • Module Summary

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