This attribute specifies the Novell Service type of the services to be
filtered from the SAP packets. The type can be entered either as a
dashed hex string or a string of hex digits entered in pairs of hex digits
up to a maximum length of 4 digits. (For example a valid type would be
ff-ff or ffff). A type preceded by a caret(^) should be interpreted as
filtering all SAP packets except for those with this type.