Compex Technologies WPE54 - Manual (Page 66)

Chapter 4 Common Configuration
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When using 128-bit encryption:
Your WEP key has to be either 13 alphanumeric characters or 26 hex characters long.
Select which of the keys defined to Encrypt data with.
Click on
Save and Reboot the access point.
A Hexadecimal value can only take in numbers 0-9 and letters A-F and is NOT case-
sensitive.