This command is used to configure DFS (Dynamic Frequency Selection) function of a radio interface.

Syntax:

dfs "interface_name" (dfsradar | dfsonly | dfsoff)

dfs "interface_name" freq { all |"frequency_list"}

dfs "interface_name" cot hh:mm

dfs "interface_name" scansec <seconds>

• "dfs "interface_name" dfsonly" – starts DFS on the device. In DFS mode device is selecting the most interference-free frequency channel by scanning all available frequencies. When scanning is done it sets the radio interface to operate on the frequency that has less presence of external interference sources.

While scanning and choosing the best channel the DFS function also takes into consideration the “density” characteristic of the radio environment. This characteristic indicates how much impulse interference was detected on the channel during the scan time. The “density” measurement results are added into the system log along with the other DFS scanning information.

• "dfs "interface_name" dfsradar" – starts DFS with radar detection. After choosing the most “clear” frequency channel the device is listening to radars that may work on the specified frequency. In case of detecting the radar it starts frequency selection process again.
• "dfs "interface_name" dfsoff" – stops DFS on the device.
• "dfs "interface_name" freq {all |"frequency_list"}" – sets list of frequencies (“frequency_list” parameter) that are allowed for choosing by DFS or allows DFS to use all radio interface enabled frequencies (“all” parameter).
• "dfs "interface_name" cot {hh:mm | off}" – allows doing DFS rescanning and choosing the most optimal frequency for using on the daily basis in the defined time that is set by “hh:mm” parameter. “Off” parameter disables this functionality.
• "dfs "interface_name" scansec <seconds>" – sets the time that is spent on scanning each available frequency in seconds. By default: 6 seconds.

DFS default operational characteristics:

• Channel occupation time: 24 hours
• Scanned time: 6 seconds for each available frequency
• Listening to the Radar on the chosen frequency: 1 minute

DFS Master/Slave configuration:

“DFS Master” is a unit that process actual frequency selection and radar detection functions. “DFS Slave” is a unit that does not choose the frequency itself but follows “DFS Master’s” frequency settings. For example, in PtP link one unit should be configured as a “DFS Master” and another one as a “DFS Slave”.

It is strongly recommended to set as a “DFS Master” the unit that is working in worthier interference conditions.

To set a unit as a “DFS Master” (example):

• Set a unit as “Master”

mint rf5.0 –type master

• Configure it as a “Roaming Leader”

mint rf5.0 roaming leader

Please refer to the “Frequency roaming” chapter for detailed description.

• Start DFS (if not already started)

dfs rf5.0 dfsonly

The unit will perform DFS functions and send the chosen frequency information to the “DFS Slave” devices.

To set a unit as a “DFS Slave” (example):

• Set a unit as “Slave”

mint rf5.0 –type slave

• Configure the corresponding “Roaming Profile” on the unit:

mint rf5.0 profile 1 –freq auto
mint rf5.0 roaming enable

Please refer to the “Frequency roaming” chapter for detailed description.

The unit will work on the same frequency as the “DFS Master” unit.