Security Settings; Wep Keys - Cisco 1240AG Series Quick Start Manual

WEP Keys

The WEP keys that you use to transmit data must be set up exactly the same
on your access point and any wireless devices with which it associates. For
example, if you set WEP Key 3 on your client adapter to 0987654321 and
select it as the transmit key, you must also set the same value for WEP Key 3
on the access point. However, the access point does not need to use WEP Key
3 as the transmit key.
Refer to the Cisco IOS Software Configuration Guide for Cisco Aironet
Access Points for instructions on setting the access point WEP keys.

Security Settings

Wireless devices attempting to authenticate with your access point must
support the same security options configured on the access point, such as
EAP or LEAP, MAC address authentication, Message Integrity Check (MIC)
WEP key hashing, and IEEE 802.1X versions.
If a wireless client cannot authenticate with your access point, contact the
system administrator for proper security settings in the client adapter and for
the client adapter driver and firmware versions that are compatible with the
access point settings.
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Quick Start Guide Cisco Aironet 1240AG Series Access Point