System Overview
QB.11-R Installation and Management
Changing Basic Configuration Information
38
Units sold only in the United States are pre-configured to scan and display only the outdoor frequencies permitted by the
FCC. No other
Country
can be configured. Units sold outside of the United States support the selection of a
Country
by
the professional installer.
NOTE:
Non-US installers should not add an antenna system until the
Country
is selected, the unit is rebooted, and the
proper power level is configured. The output power level of the final channel selected by DFS scan can be found
in the Event Log.
The Dynamic Frequency Selection (DFS) feature is enabled automatically when you choose a country and band that
require it. The Transmit Power Control (TPC) feature is always available.
Click
Configure
>
System
; then select the appropriate country for your regulatory domain from the
Country
drop-down
box.
Continue configuring settings as desired; then click
Commands
>
Reboot
to save and activate the settings. Alternatively,
if you want to save the configuration settings to the flash memory but not activate the settings, use the
save config
CLI
command.
Dynamic Frequency Selection (DFS)
NOTE:
Dynamic Frequency Selection (DFS) only applies to the Tsunami QB.11 5054-R.
The Tsunami QB.11-R supports Dynamic Frequency Selection (DFS) for FCC, IC, and ETSI regulatory domains per FCC
Part 15 Rules for U-NII devices, IC RSS-210, and ETSI EN 301-893 and 302-502 regulations, respectively. These rules
and regulations require that 802.11a devices use DFS to prevent interference with radar systems and other devices that
already occupy the 5 GHz band.
During boot-up, the unit scans the available frequency and selects the best channel. If the unit subsequently detects
interference on its channel, it rescans to find a better channel. Upon finding a new channel, the unit is required to wait 60
seconds to ensure that the channel is not busy or occupied by radar, and then commences normal operation. (In Canada,
if the channel was previously blacklisted, the unit scans for 600 seconds before commencing normal operation if the
selected channel frequency is in the 5600 - 5650 MHz range).
If you are using the unit in a country and band that require DFS, keep in mind the following:
• DFS is not a configurable parameter; it is always enabled and cannot be disabled.
• You cannot manually select the device’s operating channel; you must let the unit select the channel. You may make
channels unavailable by manually “blacklisting” them and preventing those channels being selected, in accordance
with local regulations or interference. You can also display the Channel Blacklist Table to view the channels that have
been blacklisted.
• In compliance with FCC regulations, the unit uses ATPC (Automatic Transmit Power Control) to automatically adapt
transmit power when the quality of the link is more than sufficient to maintain a good communication with reduced
transmit power. See
for more information.
Dynamic Frequency Selection (DFS) is enabled automatically based upon the country and band you select. You can tell
DFS is in use because the
Frequency Channel
field on the
Interfaces
page displays only the DFS-selected frequency.
DFS scans all available frequencies, starting with the DFS preferred channel (when configured) and skipping blacklisted
channels, to select the operating frequency automatically.
A country/band selection with DFS enabled causes the Base Station to come up in scan mode. It scans the available
frequencies and channels to avoid radar and selects a channel with the least interference.
NOTE:
Scanning is performed only on the frequencies allowed in the regulatory domain of the country selected when it is
required for radar detection and avoidance.
The SU also comes up in scan mode to scan all available frequencies to find a BSU with which it can register. Scanning
may take several minutes. After establishing a wireless link, the wireless LED stops flashing and continues to shine
green.
