User's Manual

4-11
Cisco 3200 Series Wireless MIC Software Configuration Guide
OL-7734-02
Chapter 4 Configuring Radio Settings
Enabling and Disabling World Mode (2.4-GHz Only)
Enabling and Disabling World Mode (2.4-GHz Only)
You can configure the WMIC to support 802.11d world mode or Cisco legacy world mode. When you
enable world mode, the WMIC adds channel carrier set information to its beacon. Client devices with
world mode enabled receive the carrier set information and adjust their settings automatically. For
example, a client device used primarily in Japan could rely on world mode to adjust its channel and
power settings automatically when it travels to Italy and joins a network there. Cisco client devices
running firmware version 5.30.17 or later detect whether the WMIC is using 802.11d or Cisco legacy
world mode and automatically use world mode that matches the mode used by the WMIC. World mode
is disabled by default.
Beginning in privileged EXEC mode, follow these steps to enable world mode:
Use the no form of the command to disable world mode.
Aironet extensions must be enabled for world mode operation. Aironet extensions are enabled by default.
Disabling and Enabling Short Radio Preambles (2.4-GHz Only)
The radio preamble (sometimes called a header) is a section of data at the head of a packet that contains
information that the access point and client devices need when sending and receiving packets. You can
set the radio preamble to long or short:
Short—A short preamble improves throughput performance. Cisco Wireless LAN Client Adapters
support short preambles. Early models of Cisco Aironet Wireless LAN Adapters (PC4800 and
PC4800A) require long preambles.
Long—A long preamble ensures compatibility between the WMIC and all early models of Cisco
Wireless LAN Adapters. If these client devices do not associate to your WMIC, you should use short
preambles.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface dot11radio 0 Enter interface configuration mode for the radio interface.
Step 3
world-mode
dot11d country_code code
{ both | indoor | outdoor }
| legacy
Enable world mode.
Enter the dot11d option to enable 802.11d world mode.
When you enter the dot11d option, you must enter a
two-character ISO country code (for example, the ISO
country code for the United States is US). You can find
a list of ISO country codes at the ISO website.
After the country code, you must enter indoor,
outdoor, or both to indicate the placement of the
WMIC.
Enter the legacy option to enable Cisco legacy world
mode.
Step 4
end Return to privileged EXEC mode.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.