Mixed Mode

In Mixed mode, SAP ASE allows both trusted, as with Named Pipes, and “untrusted” connections. It first examines the requested login name as specified by the client application, then, depending on the information supplied, handles the login.

SAP ASE processes the login:
Mixed mode offers users the convenience of login security integration without forcing all clients and applications to use that integration.
Note: Applications can be designed to send an empty login name field in the connection request, thereby avoiding a separate login step.