- Spectrum analyzers monitor the RF signal itself.
- Before conducting the coverage analysis survey, locating sources of potential interference is a must.
- To conduct a proper 802.11 spectrum analysis survey, the spectrum analyzer needs to be capable of scanning both the 2.4 GHz ISM band and the 5 GHz U-NII bands.
- If the background noise level exceeds –85 dBm in either the 2.4 GHz ISM band or the 5 GHz U-NII bands, the performance of the wireless network can be severely
- A noisy environment can cause the data in 802.11 transmissions to become corrupted.
- Most data applications in a Wi-Fi network can handle a layer 2 retransmission rate of up to 10 percent without any noticeable degradation in performance.
- Voice over Wi-Fi (VoWiFi) networks need to limit retransmissions at layer 2 to about 10 percent or less to guarantee the timely delivery of VoIP packets.
- After locating the sources of interference, the best and simplest solution is to eliminate them entirely.
2.4 GHz Interferers
- Microwave ovens
- 2.4 GHz cordless phones, DSSS and FHSS
- Fluorescent bulbs
- 2.4 GHz video cameras
- Elevator motors
- Cauterizing devices
- Plasma cutters
- Bluetooth radios
- Nearby 802.11, 802.11b, 802.11g, or 802.11n (2.4 GHz) WLANs
5 GHz Interferers
- 5 GHz cordless phones
- Perimeter sensors
- Digital satellite
- Nearby 5 GHz WLANs
- Outdoor wireless 5 GHz bridges