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Spirent KB Article
Doc ID: FAQ19648
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What is Dynamic Frequency Selection (DFS)?
DFS is the process of detecting radar signals that must be protected against interference from 5.0 GHz (802.11a/h) radios, and upon detection switching the operating frequency of the 5.0 GHz (802.11a/h) radio to one that is not interfering with the radar systems. The trransmit power control is used to adapt the transmission power of a radio based on regulatory requirements and range information.
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.
Flushes the power-save client queues.
Broadcasts an 802.11h channel-switch announcement.
Disassociates remaining client devices.
Randomly selects a different channel:
If the wireless device does not select a DFS-required channel, it enables beacons and accepts client associations.
If the wireless device selects a DFS-required channel, it scans the new channel for radar signals for 60 seconds.
If there are no radar signals on the new channel, the wireless device enables beacons and accepts client associations.
If a radar signal is detected, the wireless device selects a different channel.
If a preferred channel is configurable and available, it is selected first.
To configure and run DFS tests on Spirent TestCenter Application, please look at the KB articles below:
- Spirent TestCenter: How to test Dynamic Frequency Selection (DFS) on STC?
- Spirent TestCenter: How can I run different trials on a DFS test?
Product : WiFi,Spirent TestCenter