TRENDnet TEW-644UB User Manual page 12

Open System and Shared Key
Open System and Shared Key requires the user to set a WEP key to exchange
data with other wireless clients that have the same WEP key. The following will be
activated when Open, Shared Key or Auto is enabled:
Default Key: select one of the 4 keys to use.
Network Key: choose the encryption way, either in HEX or ASCII
formats, and enter the password in the blank space.
Key Length: select 64 or 128 bits as the length of the keys
Key Format: ASCII or HEX
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