User's Manual

Advanced Configuration
Tsunami QB-8100 Series (100 Mbps/5 Mbps Models) Installation and Management Guide 59
If ACS is disabled, during initialization, the device selects the Preferred Channel to be the operational channel. If ACS is
enabled, during initialization, the device scans all the channels in the configured frequency domain and selects the channel
with the best RSSI to be the operational channel.
Once the operating channel is selected, the device scans the channel for radar presence for a duration of Channel Wait Time.
If no radar is detected, the device starts operating in that channel. If radar is detected, the channel is blacklisted for 30
minutes and a different channel is selected. To select the next operational channel, the device scans all non-blacklisted
channels and selects the channel with best RSSI.
At any point of time, if Radar is detected on the current operating channel, the device blacklists that channel and scans all
non-blacklisted channels and selects the channel with best RSSI.
NOTE: Scanning is performed only on the frequencies allowed in the regulatory domain of the frequency/band
selected when it is required for radar detection and avoidance.
DFS Configuration in End Point A Mode
To co n figure DFS in End Point A mode,
1. Click ADVANCED CONFIGURATION> Wireless > Interface 1 > DFS. The DFS Configuration screen appears as
shown below.
2. Select the appropriate parameters. See the DFS Configuration table that lists the parameters and their descriptions.
3. Click OK.
Figure 4-9 DFS Configuration in End Point A Mode
4.4.7.2 DFS in End Point B Mode
1. When not connected to the End Point A, the End Point B scans continuously for all the channels in the configured
Frequency Domain for the presence of End Point A. If suitable End Point A is found in a channel, the End Point B tries
to connect to it.
NOTE: Since the device may need to scan for radar on multiple channels, you must allow a sufficient amount of time
for the units to start up. This is considerably longer than when the device is not using DFS. This is expected behavior.
The Startup time is within four minutes if no radar is detected, but up to one minute is added for every selected
channel that results in radar interference.
2. After selecting the best channel from its End Point A -scan list, the End Point B scans for the radar during Channel
Wait Time in that channel. The default Channel Wait Time value is 60 seconds. It starts transmitting only when the
channel is found clean during this scan time.