8-7
Cisco Aironet 802.11a/b/g Wireless LAN Client Adapters (CB21AG and PI21AG) Installation and Configuration Guide
OL-4211-03
Chapter8 Using the Aironet Sys tem T ray Utility (ASTU) Pop-Up Menu
This window enables you to determine when ADU and ASTU run and to choose the options that appear
on the ASTU pop-up menu. Follow these steps to make your selections.
Step1 If you want ASTU to run automatically when Windows starts, make sure the Run the program
automatically when Windows starts check box is checked. Otherwise, uncheck this check box.
Note If you do not choose this option and later want to run ASTU, you must choose the Enable Tray
Icon option from the Action drop-down menu in ADU.
Step2 In the Menu Options portion of the window, make sure the check boxes of all the options that you want
to appear in the ASTU pop-up menu are checked. Any options that are not checked will not be included
in the menu.
Note The Preferences option cannot be deselected. It always appear s in t he A ST U pop -u p m en u.
Step3 Click OK to save your changes.
Enable/Disable Radio
This option enables you to disable or enable the client adapter’s radio. Disabling the radio prevents the
adapter from transmitting RF energy. You might want to disable the client adapter’s radio in the
following situations:
•You are not transmitting data and want to conserve battery power.
•You are using a laptop on an airplane and want to prevent the adapter’s transmissions from
potentially interfering with the operation of certain devices.
When the radio is enabled, it periodically sends out probes even if it is not associated to an access point
(in infrastructure mode) or another client (in ad hoc mode), as required by the 802.11 speci fication.
Therefore, it is important to disable it around devices that are susceptible to RF interference.
Note If the client adapter’s radio is disabled, your client adapter is not associated, and a me ssage appears when
you hover the cursor over the ASTU icon to inform you that the wireless network interface is disabled.
Note If your client adapter’s radio is disabled before your computer ent ers st andby o r h ibe rna te mo de or
before you reboot the computer, the radio remains disabled when the computer resum es. You must enable
the radio to resume operation.
If the radio is enabled, choose Disable Radio to disable the radio.
If the radio is disabled, choose Enable Radio to enable the radio.