Honeywell XYR301E, Руководство пользователя

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User Manual XYR301E Wireless Ethernet
34-XY-25-41 Page 55
3.15 Roaming
In certain cases a Client may be in a mobile situation and require a method of roaming to another Access Point.
Normal network communications provides only basic roaming behaviour which means as the client moves further from
the AP it will go through a period of poor communication followed by a complete disconnection of the radio link.
It is at this point that the Client will scan for Access Points and if one is in range it could take up to 10 seconds for the
client to establish a connection.
Fast Roaming will significantly reduce the time taken for a client to roam from Access Point to Access Point. Also the
discovery of AP‘s is done before the existing radio link deteriorates therefore eliminating the periods of poor
performance during transition to the next AP.
The following settings/thresholds can be configured to fine tune the fast roaming process.
Fast Roaming Fast Roaming allows a client (station) to roam to an AP with a stronger signal
strength without disrupting communications. Or roam seamlessly between
multiple Access Points based on configuration parameters such as RSSI
threshold.
Passive Scanning (STA only) Selecting this item stops a Client device from sending
―
probe request
messages when it is searching for an access point to connect to. Instead, the
client waits for a beacon transmission from the access point. Passive Scanning
should be disabled when Fast Roaming is enabled.
Roam Scan Threshold Background Scan will be initiated when the RSSI to the currently connected
AP drops below this threshold and Fast Roaming (above) is enabled. Default is
-90dBm
Roam changeover Threshold This is the RSSI value above the Roam Scan Threshold that is required for the
Client to change to the new Access Point. In the example shown above the
Access Point RSSI would need to be above -84dB before it would changeover.
In general, the Roam Changeover Threshold should be at least 6dB, otherwise
changeovers could occur too frequently.
Roam check Interval If a better AP is not found, the background scan is repeated every Roam Check
Interval while the signal strength to the currently connected AP is below the
Roam Scan Threshold.
Channel Width Channel Width setting will apply only when there are no entries in the Scan
List. Selects channel width bands for background scan. If 5MHz is selected
then only 5MHz channels will be scanned during the background scan. Default
is Auto, which means all channels will be scanned.
Save Changes Save changes to non-volatile memory. Changes will not take effect until
module is reset.
Save Changes and Reset
Save changes to non-volatile memory and reset module