Dynamic Frequency Selection . What JD was talking about earlier. The TLDR is if you have lots of radar around it will be switching frequencies a lot, may cause you to pickup interference from other APs and you will get lots of alerts. These will show up as alerts (and can be emailed to you) in the clooud management software..
I will use the Cisco definition since its quite good.
I will use the Cisco definition since its quite good.
DFS is the process of detecting radar signals that must be protected against interference from 5GHz (802.11a/n/ac/h) radios, by dynamically switching the operating frequency of the 5GHz radio to one that does not interfere with radar. Transmit Power Control (TPC) is similarly used to adapt the transmission power of a radio based on regulatory requirements and range information. Certified devices have the ability to enable DFS to take advantage of additional channel options, while listening for radar communication to dynamically update their radio settings if necessary.
DFS-enabled radios monitor the operating frequency for radar signals. If radar signals are detected on the channel, the wireless device takes these steps:
- Blocks new transmissions on the channel.
- Broadcasts an 802.11h channel-switch announcement.
- Disassociates remaining client devices.
- Access Point selects a different channel permitted within the regulatory domain.
- After the DFS non-occupancy period has been reached for the original DFS channel, if no clients are associated it will move back to the original DFS channel and scan for 60 seconds. If there are no radar signals on the new channel, the wireless device enables beacons and accepts client associations. The non-occupancy period is defined by the regulatory domain but in most cases is 30 minutes.