DFS (Dynamic Frequency Selection) allows an AP to use channels in the same spectrum that some RADAR systems use and provide a method of changing channels when RADAR signals are detected. In this example, we will use a LANforge CT712 which is our customized script and integrated GUI control for the HackRF-One Software-Defined Radio (SDR) to generate the RF pulses that simulate RADAR signals and cause a third-party AP under test to detect and change channels. It is recommended that this type of testing be done in a RF isolation chamber to limit interference to production WLAN and RADAR systems in use. |
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For more information see
Wikipedia: 5GHz Channels
WLAN Pros WiFi Channel Reference Sheet
For more information see
WiFi Alliance: DFS Best Practices