Why does wpa-psk only work with numbers in autonomous 1140?
If you access the AP via the GUi, click on security, then SSID manager and then on the ? on the left side you will be able to check on this information.
WPA Pre-shared Key
To support client devices using static WEP keys and WPA key management, you must configure a pre-shared key on the access point. Enter the key and choose the appropriate radio button to specify if you are entering hexadecimal or ASCII characters.
If you use hexadecimal, you must enter 64 hexadecimal character to complete the 256-bit key. If you use ASCII, you must enter a minimum of 8 letters, numbers, or symbols, and the access point expands the key for you. You can enter a maximum of 63 ASCII characters.