1. WLAN Maintenance and Troubleshooting Design and Site Survey Considerations

2. Building Materials

3. Identify Problematic Areas

4. Signal Attenuation These values are examples, and attenuation may vary depending on the actual material used 3 - 6 dB Wireless device position 12 dB Metal door in brick wall 6 dB Metal door 3 dB Office window 4 dB Cinderblock wall 6 dB Glass wall with metal frame 3 dB Plasterboard wall Signal Attenuation Through Object Object in Signal Path

5. Non-802.11 Sources of Interference 20 MHz 20 MHz 802.11 a or g OFDM 802.11 b DSSS

6. Microwave Ovens Loud moving signal seen at max. Duty cycle higher in part of band Drifts in frequency

7. Bluetooth Speckled pattern in spectrogram Duty cycle spread across band See more hops in max. hold See hops in max.

8. Wireless Phones Pulses increase in max. Speckled appearance in swept = frequency hopper Duty cycle fairly low and spread across band

9. Analog Cameras Constant signal seen in avg./max. Duty cycle Is 100% Constant power level stripe

11. Which Coverage for Which Usage

12. WLAN Coverage and Capacity

13. Recommended Parameters for 2.4-GHz Data Networks Minimum packet performance should be greater than 90 percent successful packet transfer (10 percent lost) 31 22 -62 -72 48 14 4 -84 -94 1 16 6 -81 -91 2 18 8 -79 -89 6/5.5 20 10 -72 -82 12/11 22 12 -67 -77 24 28 18 -63 -73 36 35 25 -61 -71 54 Recommended Minimum SNR Rx SNR Recommended Minimum Rx Threshold Rx Threshold Data Rate

15. AP Placement for Location

16. Coverage Overlap

17. Multifloor Coverage

18. Site Survey Tools

19. Basic Survey Tools