(ASE) Software in the
presentation layer of the
OSI seven layer model which provides an abstracted interface
layer to service application protocol data units (APDU).
Because applications and networks vary, ASEs are split
into common services and specific services.
Examples of services provided by the common application service element (CASE) include remote operations (ROSE) and
database concurrency control and recovery (CCR).
The specific application service element (SASE) provides
more specialised services such as file transfer, database
access, and order entry.
Csico docs.