Specifications

Configuration Tsunami MP.11 5012-SUR Installation and Management
Network Parameters
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Click Configure > Network > Roaming to configure Roaming.
Enable or disable the Roaming feature by selecting the Enable Roaming Status from the drop down menu. The default
value is disabled.
NOTE: To enable roaming, you must enable Roaming Status on both the BSU and the SU.
An SU scans all available channels for a given bandwidth during roaming. In order to reduce the number of channels an
SU has to scan and thus decrease the roaming time, a channel priority list that tells the SU what channels to scan is
implemented. Each channel in the channel priority list is specified with its corresponding bandwidth and the priority with
which it should be scanned, either “Active” (standard priority), “Active High” (high priority), or “Inactive”.
An SU will scan all channels indicated as “Active” during roaming. However, it will scan active channels indicated as
“High Priority” before scanning active channels indicated as standard priority. Channels that are not going to be used in
the wireless network should be configured as “Inactive” so that the SU can skip over those channels during scanning
saving this way time.
A BSU broadcasts the channel priority list to all valid authenticated SUs in its sector. It re-broadcasts the channel priority
list to all SUs every time the list is updated on the BSU. For information for configuring the channel priority list on the BSU
see the Tsunami MP.11 5054-R and 2454-R Installation and Management Guide.
Note that an SU may roam from one BSU with a bandwidth setting to another BSU with a different bandwidth setting.
Since in this case more channels need to be scanned than with only one channel bandwidth setting, it is important that
the channel priority list is properly used to limit scanning time.
When Scanning Across Bandwidth on the SU is enabled (see Interface Parameters), the SU supports bandwidth
selection of the communications channel of either 20 MHz, 10 MHz, or 5 MHz. This allows the BSUs in the network to be
set to different bandwidths while an SU can still roam from one BSU to the next, because it will not only scan other
frequencies (when the signal level or quality are lower than the threshold) but it will also switch to other bandwidths to find
a BSU that may be on another bandwidth than its current one.
During roaming, the SU will start scanning first the channels on its current
bandwidth from the “Active” channel list
provided by the BSU in order to find a BSU to register, since that is the most likely setting for other BSUs in the network.
If the SU cannot find an acceptable roaming candidate, it will switch bandwidth and start scanning channels on that
corresponding bandwidth from the “Active” channel list provided by the BSU. The process is repeated until the SU finds
an appropriate BSU to register.
SU Screen
Enable or disable the Roaming feature in the Roaming Status drop-down box. The default value is disabled.