Edimax Technology PS-1210MFn - Manual (Page 81)

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Key Format – You may select to use ASCII Characters
(alphanumeric format) or Hexadecimal digits (in the "A-F", "a-f" and
"0-9" range) to be the WEP Key.
PassPhrase – A “PassPhrase” simplifies the WEP encryption
process by automatically generating the WEP encryption keys for
the MFP Server.
Default Key – Select one of the four keys to encrypt your data.
Only the key you select it in the “Default key” will take effect.
Key 1 – Key 4 – The WEP keys are used to encrypt data
transmitted within the wireless network. Fill the text box by
following the rules below.
64-bit WEP: input 10-digit Hex values (in the "A-F", "a-f" and "0-9"
range) or 5-digit ASCII character as the encryption keys. For
example: “0123456aef“ or “Guest“.
128-bit WEP: input 26-digit Hex values (in the "A-F", "a-f" and "0-9"
range) or 10-digit ASCII characters as the encryption keys. For
example: “01234567890123456789abcdef“ or “administrator“.