In order to set up WEP Wireless Security on your Cisco Small Business router, complete these steps:
Access the router's web-based setup page. For instructions, click here.
When the router's web-based setup page appears, click Wireless > Wireless Security.
Look for Security Mode, and select WEP.
Select any number under the Default Transmit Key in order to determine which key you will use. In this example, we selected number 1.
Look for WEP Encryption, and select 128 bits 26 hex digits.
Type a wireless network password of your choice, such as "MySecretKey" and click Generate.
Note: Create a password that is unique for your network and is a combination of numbers and letters up to 16 characters.
The result is a string of random characters. Copy the resulting string, since this will be the key to your wireless network.
Note: Do not give this key to anyone. This will be your wireless network's key.