RFC 1085 (rfc1085) - Page 2 of 32

ISO presentation services on top of TCP/IP based internets

RFC 1085               ISO Presentation Services           December 1988


      Application Context:
         The collection of application service elements which
         cooperatively interact within an application-entity.

      Application Service Element:
         A standardized mechanism, defined by both a service and a
         protocol, which provides a well-defined capability, e.g.,

         ROSE -  the Remote Operations Service Element,
                 which orchestrates the invocation of "total"
                 operations between application-entities [ISO9066/2].

         ACSE -  the Association Control Service Element,
                 which manages associations between application
                 entities [ISO8650].

      Object Identifier:
         An ordered set of integers, used for authoritative
         identification.

      Presentation Service:
         A set of facilities used to manage a connection between two
         application-entities.  The fundamental responsibility of the
         presentation service is to maintain transfer syntaxes which
         are used to serialize application protocol data units for
         transmission on the network and subsequent de-serialization
         for reception.

      Protocol Data Unit (PDU):
         A data object exchanged between service providers.

      Serialization:
         The process of applying an abstract transfer notation to an
         object described using abstract syntax notation one (ASN.1)
         [ISO8824] in order to produce a stream of octets.
         De-serialization is the inverse process.

         It is assumed that the reader is familiar with terminology
         pertaining to the reference model [ISO7498], to the service
         conventions in the model [ISO8509], and to the
         connection-oriented presentation service [ISO8822].

3. Scope

   The mechanism proposed by this memo is targeted for a particular
   class of OSI applications, namely those entities whose application
   context contains only an Association Control Service Element (ACSE)
   and a Remote Operations Service Element (ROSE).  In addition, a



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