Brother HL-4050CDN Network User's Manual page 29

Network Key
There are some rules for each security method:
Open system/Shared key with WEP
This key is a 64-bit or 128-bit value that must be entered in an ASCII or hexadecimal format.
64 (40) bit ASCII:
64 (40) bit hexadecimal:
128 (104) bit ASCII:
128 (104) bit hexadecimal:
WPA-PSK/WPA2-PSK and TKIP or AES
Uses a Pre-Shared Key (PSK) that is more than 7 and less than 64 characters in length.
LEAP
Uses User ID and Password.
• User ID: less than 64 characters in length.
• Password: less than 32 characters in length.
Configuring your printer for a wireless network (For HL-4070CDW)
Uses 5 text characters. e.g. "WLLAN" (this is case sensitive).
Uses 10 digits of hexadecimal data. e.g. "71f2234aba"
Uses 13 text characters. e.g. "Wirelesscomms" (this is case
sensitive)
Uses 26 digits of hexadecimal data. e.g.
"71f2234ab56cd709e5412aa2ba"
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