SMC Networks SMCNAS04 - Manual (Page 81)

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IP, subnet mask, Gateway, DNS address:
9
Maximum number of characters: 15 (3 “.” Included)
9 Rules: The format is xxx.xxx.xxx.xxx and the value of xxx is
between 0 and 255
NTP server name:
9
Maximum number of characters: 64
9 Rules: Can include only letters (uppercase and lowercase A-Z),
numbers (0-9), hyphens (-), underlines (_) and dots (.)
SMTP user name:
9 Maximum number of characters: 64
9 Rules: Cannot include quote (‘),double quote (“),backslash
(\),question mark (?), (&), angle brackets(<) and (>).