Thor VM1 with Microsoft Windows Embedded Standard 2009 User Guide 169
Global Parameters
Parameter Default Function
Roam Trigger -65 dBm If signal strength is less than this trigger value, the client looks for a
different Access Point with a stronger signal.
Options are: -50 dBm, -55, -60, -65, -70, -75, -80, -85, -90 dBm or .
Roam Delta 5 dBm The amount by which a different Access Point signal strength must
exceed the current Access Point signal strength before roaming to
the different Access Point is attempted.
Options are: 5 dBm, 10, 15, 20, 25, 30, 35 dBm or Custom.
Roam Period 10 sec. The amount of time, after association or a roam scan with no roam,
that the radio collects Received Signal Strength Indication (RSSI)
scan data before a roaming decision is made.
Options are: 5 sec, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60 seconds
or Custom.
BG Channel Set Full Defines the 2.4GHz channels to be scanned for an AP when the
radio is contemplating roaming. By specifying the channels to
search, roaming time may be reduced over scanning all channels.
Options are:
Full (all channels)
1,6,11 (the most commonly used channels)
1,7,13 (for ETSI and TELEC radios only)
or Custom.
DFS Channels Off Support for 5GHZ 802.11a channels where support for DFS is
required.
Options are: On, Off, Optimized.
Not supported (always off) in some releases.
DFS Scan Time 120 ms. ABG radio only. The amount of time the radio will passively scan
each DFS channel to see if it will receive a beacon.
Recommended value is 1.5 times that of the AP's beacon period.
Ad Hoc Channel 1 Use this parameter when the Radio Mode profile parameter is set to
Ad Hoc.
Specifies the channel to be used for an Ad Hoc connection to
another client device. If a channel is selected that is not supported
by the by the radio, the default value is used.
Options are:
1 through 14 (the 2.4GHz channels)
36, 40, 44, 48 (the UNII-1 channels)
Aggressive Scan On When set to On and the current connection to an AP weakens, the
radio aggressively scans for available APs.
Aggressive scanning works with standard scanning (set through
Roam Trigger, Roam Delta and Roam Period). Aggressive scanning
should be set to On unless there is significant co-channel
interference due to overlapping APs on the same channel.
Options are: On, Off
CCX or CCX
Features
Optimized Use of Cisco Compatible Extensions (CCX) radio management and
AP specified maximum transmit power features.
Options are:
Full - Use Cisco IE and CCX version number, support all CCX
features. The option known as “On” in previous versions.
Optimized –Use Cisco IE and CCX version number, support all CCX
features except AP assisted roaming, AP specified maximum
transmit power and radio management.
Off - Do not use Cisco IE and CCX version number.
Cisco IE = Cisco Information Element.
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