User's Manual

Advanced Configuration
Tsunami QB-8100 Series (100 Mbps/5 Mbps Models) Installation and Management Guide 58
Modifying the Guard Interval, Data Streams, Tx Antenna Status and Rx Antenna Status will reset the Tx Rate to default.
4.4.7 DFS
Dynamic Frequency Selection is a mechanism to allow unlicensed devices to share spectrum with existing radar systems.
The operation of a system with DFS capability takes place in the following sequence:
1. The master device that can initiate communication selects a channel and monitors that channel for potential radar
signal for a minimum listening time (channel availability check time). No transmissions can occur during this period.
2. If the radar is detected, then the system has to go and select another channel and repeat the channel availability check
on the new channel (the original channel is added to a list of channels with radar).
3. Once the channel has been scanned for radar and found clean, the device starts using that channel.
4. While using the channel, the network’s master device continuously monitors for potential interference from a radar
source (this is referred to as in-service monitoring). If the radar is detected, then the network’s master device stops
transmitting in that channel. The channel is added to the list of channels with radar.
5. The master device then selects a new channel (channel that is not on the radar list).
6. A channel on the radar list can be purged once the Non Occupancy Period (NOP) has elapsed for that channel.
NOTE: For Europe 5.8 GHz channel, once End Point A / End Point B finds a clean channel (after 60 sec radar scan), it
does not need to perform any 60 seconds scan again for RADAR for next 24 hours. This is not applicable when device
is rebooted or that particular channel got blacklisted earlier.
4.4.7.1 DFS in End Point A Mode
Dynamic Frequency Selection (DFS) is enabled automatically based on the selected frequency domain. The device selects a
channel to operate as follows:
Guard Interval Possible values for Guard interval are 800 nSec and
400 nSec. 400 nSec is valid only for 40 MHz channel
bandwidth.
Data Streams MIMO radio uses multiple antennas for transmitting
and receiving the data. These data streams specify the
number of data streams over the air transmitted or
received in parallel.
• Data streams “1-Longer Range” uses a single
flow of the signals on the antennas.
• Data streams “2-Higher Throughput” uses
double flow of the signals on the antennas in
parallel.
Tx Antenna Status This parameter allows the user to specify the antenna
to be used for data transmission. Selecting the
respective antenna number checkbox specifies radio to
use that specific antenna for data transmission.
Rx Antennas Status This parameter allows the user to specify the antenna
to be used for data reception. Selecting the respective
antenna number checkbox specifies radio to use that
specific antenna for data reception.
Parameter Description