As of Adaptive Server version 12.5.1, the 4-byte form of UTF-8 is supported. This form is used to represent the same rare Unicode characters that are represented in UTF-16 by pairs of 16-bit values (“surrogate pairs”). Prior to Adaptive Server version 12.5.1, only the 3-byte forms of UTF-8 were supported. If you have installed the UTF-8 character set in an Adaptive Server server earlier than version 12.5.1, you should reinstall it to enable the use of the 4-byte form of UTF-8.
