User's Manual

Tsunami MP.11 2454-R, 5054-R, and 5054-R-LR Installation and Management
Chapter 3. Management Overview 27
Radar detection is performed only by the BSU and not by the SU. When an SU is set to a country in which
DFS is used, it scans all available channels upon startup looking for a BSU that best matches its connection
criteria (such as Base Station System Name, Network Name, and Shared Secret). The SU connects to the
BSU automatically on whatever frequency the BSU has selected. Because of this procedure, it is best to set
up the BSU and have it fully operational before installing the SU, although this is not required. If a BSU
rescans because of radar interference, the SU loses its wireless link. The SU waits 30 seconds (when the
Mobility feature is enabled, the SU starts scanning for a BSU instantly rather than waiting 30 seconds); if it
finds that it could not receive the BSU in this amount of time, it rescans the available frequencies for an active
BSU.
2. Guarantee the efficient use of available frequencies by all devices in a certain area. To meet this
requirement, the BSU scans each available frequency upon startup and selects a frequency based upon the
least amount of noise and interference detected. This lets multiple devices operate in the same area with
minimal interference. This procedure is done only at startup; if another non-radar device comes up on the
same frequency, the BSU does not detect this or rescan because of it. It is expected that other devices using
these frequencies also are in compliance with country regulations, so this should not happen.
Transmit Power Control
Transmit Power Control is a manual configuration selection to reduce the unit’s output power. The maximum
output power level for the operating frequency can be found in the event log of the unit’s embedded software.
By default, the unit lets you transmit at the maximum output power that the radio can sustain for data rate and
frequency selected. However, with Transmit Power Control (TPC), you can adjust the output power of the unit to
a lower level in order to reduce interference to neighboring devices or to use a higher gain antenna without
violating the maximum radiated output power allowed for your country. Also, most countries in the ETSI
regulatory domain require the transmit power to be set to a 6 dB lower value than the maximum allowed EIRP
when link quality permits, as part of the DFS requirements.
You can see your unit’s current output power for the selected frequency in the event log. The event log shows the
selected power for all data rates, so you must look up the relevant data rate to determine the actual power level.
Note: This feature only lets you decrease your output power; you cannot increase your output power beyond
the maximum the radio allows for your frequency and data rate.
See “Configure System Parameters” on page 42 to configure Country. See “Configure the Wireless Interface” on
page 57 to configure Transmit Power Control.
SU REGISTRATION
The list of parameters you must configure for registration of the SU on a BSU are:
• Network Name
• Base Station System Name (when used; otherwise leave blank)
• Network Secret
• Encryption (when used)
• Frequency Channel (or Roaming or DFS)
See “Configure System Parameters”
on page 42 to see the description of these fields and to configure them.
Notes:
• The frequency channel must be the same for the BSU and the SU in order to register the SU when
roaming is not enabled and DFS is not required.
• Channel Bandwidth and Turbo mode must be the same for the BSU and SU in order to register the SU.