Country And Related Settings; Dynamic Frequency Selection (Dfs) - Proxim Tsunami MP-8100 Series Installation And Management Manual

3.1 Country and Related Settings

The unit's Advanced Configuration window provides a frequency domain field that automatically provides the allowed
bandwidth and frequencies for the selected country.
Units sold 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 using frequency domain.
NOTE: Non-US installers should not add an antenna system until the Country is selected, the device is rebooted, and
the proper power level is configured. The Transmit Power Control (TPC) feature should be used to reduce the power
when required.
The Dynamic Frequency Selection (DFS) feature is enabled automatically when you choose a country and band that require it.
Frequency Domains and Channels
Refer to

3.2 Dynamic Frequency Selection (DFS)

The Tsunami MP-8100 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 the devices operating in the 5 GHz band must use DFS to prevent interference with radar systems.
BSU
Dynamic Frequency Selection (DFS) is enabled automatically based on the selected frequency domain. The device selects a
channel to operate as follows:
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.
SU
When not connected to the BSU, the SU scans continuously for all the channels in the configured Frequency Domain for the
presence of BSU. If suitable BSU is found in a channel, the SU 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.
Tsunami MP-8100 Installation and Management Guide
for information on which bands need DFS.
Basic Configuration
37