Site-defined character set restrictions for networked and mainframe clients are described in the following sections.
Site-defined character sets based on the ASCII character set must preserve the definition of code points 0-127. This means that you may only redefine those characters whose numeric value is 128 or greater.
When you create a custom character set based on the EBCDIC character set, you must retain a certain subset of the EBCDIC characters. The required characters are identified as shaded code points in the table.
The shaded code points must remain as defined, and the site-defined translation tables must map these code points into the correct internal Teradata Database representations.