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[WLM] Ringmaster - Spectrum Analysis - Troubleshooting Wireless Conectivity

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Article ID: KB25073 KB Last Updated: 04 Mar 2017Version: 2.0
Summary:
WLA522 series APs collect information about all devices, which operate in the wireless bands, identify and evaluate the information as a potential interference source, and forwards it to WLC. The WLC controls the access points, collects spectrum data, and allows RingMaster to graphically display the information.
Symptoms:
  • To use the Spectrum Analysis feature in RingMaster, you must have an Advanced Monitoring license and also WLA522s or WLA522Es installed in the network.

  • A large university implemented the WLS solution over a outdoor campus and multiple buildings by using numerous WLCs and WLAs.

  • The university IT department uses RingMaster for RF Planning and places WLA522s appropriately around the campus for the best wireless coverage and client access.

  • Students and faculty can access the network and teach classes via wireless connectivity on their laptops and send lesson plans to students via e-mail.

  • RingMaster is also configured to send alarms via e-mail to the network administrator. Running the Spectrum Analysis to evaluate the network for interference reveals no interference.


  • After a few months, a classroom in the Science building reported multiple issues with the wireless connectivity, including service interruptions on a periodic basis.

  • The WLA522s were configured with a radio-profile, which included the spectrum analysis being run in the sentry mode to concurrently scan for interference on the WLAN.

  • At the time of the service interruptions, RingMaster sent alarms to the IT personnel, which indicated that a device was causing wireless interference on the WLA located near the Science building.


Cause:

Solution:
When the alerts were sent, the network administrator used the Spectrum Analysis feature in RingMaster to determine the location of the interfering device and the type of device that was causing the interference.



By examining the RingMaster Spectrum Analysis data and also using the Interference Sources feature, the network administrator was able to pinpoint to a newly installed cordless phone as the interference source; specifically on Channel 6 of the 2.4 GHz radio.



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