Cisco 340 - Manual (Page 9)

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Cisco Aironet 340, 350, and CB20A Wireless LAN Client Adapters Installation and Configuration Guide for Windows
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Chapter 5 Configuring the Client Adapter
Setting RF Network Parameters
Use Short Radio Headers Checking this check box sets your client adapter to use short radio
headers. However, the adapter can use short radio headers only if the
access point is also configured to support them and is using them. If any
clients associated to an access point are using long headers, then all
clients in that cell must also use long headers, even if both this client
and the access point have short radio headers enabled.
Short radio headers improve throughput performance; long radio
headers ensure compatibility with clients and access points that do not
support short radio headers.
Default: Checked
Note This parameter is available only for 2.4-GHz client adapters.
Note This parameter is referred to as Preambles on the access point
screens.
World Mode Checking this check box enables the client adapter to adopt the
maximum transmit power level and the frequency range of the access
point to which it is associated, provided the access point is also
configured for world mode. This parameter is available only in
infrastructure mode and is designed for users who travel between
countries and want their client adapters to associate to access points in
different regulatory domains.
Default: Unchecked
Note This parameter is available only for 2.4-GHz client adapters.
Note When World Mode is enabled, the client adapter is limited to
the maximum transmit power level allowed by the country of
operation’s regulatory agency.
Scan For A Better Access
Point Checking this check box causes the client to look for a better access
point if the signal strength of its associated access point is less than the
specified value after the specified time and to switch associations if it
finds one.
Example: If the default values of 20 seconds and 50% are used, the
client begins monitoring the strength of the signal received
from its associated access point 20 seconds after becoming
associated. The monitoring continues once per second. If
the client detects a signal strength reading below 50%, it
scans for a better access point.
Range: 5 to 255 seconds; 0 to 75% signal strength
Defaults: Checked, 20 seconds, 50% signal strength
Note The ability to specify the time and signal strength is available
in ACU version 6.1 or later, which is included in Install Wizard
version 1.1 or later.
Table 5-3 RF Network Parameters (continued)
Parameter Description