The Free On-line Dictionary of Computing (30 December 2018):

Application Service Element

    (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
   (http://cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/osi_prot.htm).

   (2003-09-27)