Edimax PS-1210MFn Manual page 64

You can select "64 bit" or "128 bit" length and "Hexadecimal" or
"ASCII" format for the encryption key. Longer key length can
provide stronger security but worth communication performance.
PassPhrase – A "PassPhrase" simplifies the WEP encryption
process by automatically generating the WEP encryption keys for
the MFP Server. This setting is only valid when the security mode
is in "WEP(HEX)".
Key 1 to Key 4 – Enter four key values by following the rules
below and select one key as the default key.
If the key length is 64-bit, enter 10-digit Hex values or 5-digit ASCII
values as the encryption keys. For example: "0123456aef" or
"Guest".
If the key length is 128-bit, enter 26-digit Hex values or 13-digit
ASCII values as the encryption keys. For example:
"01234567890123456789abcdef" or "administrator".
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