Cisco Systems CB21AG manual Parameter Description, Wireless Mode

Chapter 5 Configuring the Client Adapter

Setting Roaming Parameters in the Windows Control Panel

Table 5-5	Roaming Parameters (in the Windows Control Panel)
Parameter		Description
BSS Aging Interval		The amount of time (in seconds) that the client keeps an access point in
		its roaming scanlist after it can no longer communicate to that device.
		The higher the value, the greater the number of access points to which
		the client may roam.
		Range: 20 to 300 seconds (in 10-second increments)
		Default: 120 seconds
		Note Cisco recommends that you set the BSS Aging Interval to twice
		the value of the Scan Valid Interval. For example, if the Scan
		Valid Interval is 50, the BSS Aging Interval would be 100.
Scan Valid Interval		The amount of time (in seconds) before the client starts scanning for a
		better access point after reaching the roaming threshold or missing
		beacons. (See the threshold criteria in the table below.) The higher the
		value, the less time the client spends scanning for a better access point
		and the more time it has to send data.
		Range: 20 to 120 seconds (in 5-second increments)
		Default: 60 seconds
		Note The client does not scan for a new access point as long as it has
		a good connection and is passing data.
			Signal Strength	Transmit Rate
		Wireless Mode	Threshold (dBm)	Threshold (Mbps)
		5 GHz, 54 Mbps or	24	24
		2.4 GHz, 54 Mbps
		2.4 GHz, 11 Mbps	24	9
		(other modes enabled)
		2.4 GHz, 11 Mbps	24	5
		(only mode enabled)

Cisco Aironet 802.11a/b/g Wireless LAN Client Adapters (CB21AG and PI21AG) Installation and Configuration Guide

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