![](/images/backgrounds/160496/160496-270223x1.png)
The parameter value is displayed as “Custom” when the operating system registry has been edited to set the Summit parameter to a value that is not available from the parameter’s drop down list. Selecting Custom from the drop down list has no effect. Selecting any other value from the drop down list will overwrite the “custom” value in the registry.
Global ParametersParameter | Default | Function |
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Roam Trigger | If signal strength is less than this trigger value, the client looks for a dif- | |
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| ferent Access Point with a stronger signal. |
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| Options are: |
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Roam Delta | 5 dBm | The amount by which a different Access Point signal strength must ex- |
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| ceed the current Access Point signal strength before roaming to the dif- |
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| ferent Access Point is attempted. |
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| Options are: 5 dBm, 10, 15, 20, 25, 30, 35 dBm or Custom (page |
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Roam Period | ABG: 10 sec. | The amount of time, after association or a roam scan with no roam, that |
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| the radio collects Received Signal Strength Indication (RSSI) scan data |
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| before a roaming decision is made. |
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| Options are: 5 sec, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60 seconds or |
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BG Channel Set | Full | Defines the 2.4GHz channels to be scanned for an AP when the radio |
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| is contemplating roaming. By specifying the channels to search, roam- |
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| ing time may be reduced over scanning all channels. |
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| Options are: |
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| Full (all channels) |
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| 1,6,11 (the most commonly used channels) |
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| 1,7,13 (for ETSI and TELEC radios only) |
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DFS Channels | Off | Support for 5GHZ 802.11a channels where support for DFS is required. |
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| Options are: On, Off. |
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| Not supported (always off) in some releases. |
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DFS Scan Time | 120 ms. | ABG radio only. The amount of time the radio will passively scan each |
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| DFS channel to see if it will receive a beacon. |
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| Recommended value is 1.5 times that of the AP's beacon period. |
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Ad Hoc Channel | 1 | Use this parameter when the Radio Mode profile parameter is set to Ad |
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| Hoc. |
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| Specifies the channel to be used for an Ad Hoc connection to another |
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| client device. If a channel is selected that is not supported by the by the |
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| radio, the default value is used. |
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| Options are: |
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| 1 through 14 (the 2.4GHz channels) |
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| 36, 40, 44, 48 (the |
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Aggressive Scan | On | When set to On and the current connection to an AP weakens, the radio |
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| aggressively scans for available APs. |
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| Aggressive scanning works with standard scanning (set through Roam |
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| Trigger, Roam Delta and Roam Period). Aggressive scanning should |
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| be set to On unless there is significant |
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| overlapping APs on the same channel. |
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| Options are: On, Off |
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CCX or | ABG: Optimized | Use of Cisco Compatible Extensions (CCX) radio management and AP |
CCX Features |
| specified maximum transmit power features. |
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| This parameter cannot be changed. |
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WMM | Off | Use of |
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| Options are: On, Off |
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| Devices running Windows XP can change the default value. Devices |
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| running all other OS cannot change the default value. |
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Auth Server | Type 1 | Specifies the type of authentication server. |
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| Options are: Type 1 (ACS server) and Type 2 |
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