EN 27498 : 1989

0 Introduction
1 Scope and field of application
2 Definitions
3 Notation
4 Introduction to Open Systems Interconnection (OSI)
  4.1 Definitions
  4.2 Open Systems Interconnection environment
  4.3 Modelling the OSI environment
5 Concepts of a layered architecture
  5.1 introduction
  5.2 Principles of layering
  5.3 Communication between peer-entities
  5.4 Identifiers
  5.5 Properties of service-access-points
  5.6 Data-units
  5.7 Elements of layer operation
  5.8 Routing
  5.9 Management Aspects of OSI
6 Introduction to the specific OSI layers
  6.1 Specific layers
  6.2 The principles used to determine the seven layers of
      the Reference Model
  6.3 Layer descriptions
7 Detailed description of the resulting OSI architecture
  7.1 Application Layer
  7.2 Presentation Layer
  7.3 Session Layer
  7.4 Transport Layer
  7.6 Network Layer
  7.6 Data Link Layer
  7.7 Physical Layer
Annexes
A Brief explanation of how the layers were chosen
B Alphabetical index to definitions

Provides the Reference Model of Open Systems Interconnection.