CCITT Rec. X.200 (11/1988) – REFERENCE MODEL OF OPEN SYSTEMS INTERCONNECTION FOR CCITT APPLICATIONS
CONTENTS
0 Introduction
0.1 About this Recommendation
1 Scope and field of application
1.1 The scope of the Reference Model
1.2 The application of the Reference Model
2 Definitions
3 Notation
4 Introduction to Open Systems Interconnection (OSI)
4.1 Definitions
4.1.1 real system
4.1.2 real open system
4.1.3 open system
4.1.4 application-process
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
5.2.1 Definitions
5.2.2 Description
5.3 Communication between peer entities
5.3.1 Definitions
5.3.2 Description
5.4 Identifiers
5.4.1 Definitions
5.4.2 Description
5.5 Properties of service-access-points
5.6 Data Units
5.6.1 Definitions
5.6.2 Description
5.7 Elements of layer operation
5.7.1 Definitions
5.7.2 Protocol selection
5.7.3 Properties of connections
5.7.4 Connection establishment and release
5.7.5 Multiplexing and splitting
5.7.6 Transfer of data
5.7.7 Error functions
5.8 Routing
5.9 Management aspects of OSI
5.9.1 Definitions
5.9.2 Introduction
5.9.3 Categories of management activities
5.9.4 Principles for positioning management functions
6 Introduction
6.1 Specific layers
6.2 The principles used to determine the seven layers in the Reference Model
6.3 Layer descriptions
7 Detailed description of the resulting OSI architecture
7.1 Application layer
7.1.1 Definitions
7.1.2 Purpose
7.1.3 Services provided to applications-processes
7.1.4 Functions within the application layer
7.2 Presentation layer
7.2.1 Definitions
7.2.2 Purpose
7.2.3 Services provided to the application layer
7.2.4 Functions within the presentation layer
7.3 Session layer
7.3.1 Definitions
7.3.2 Purpose
7.3.3 Services provided to the presentation layer
7.3.4 Functions within the session layer
7.4 The transport layer
7.4.1 Definitions
7.4.2 Purpose
7.4.3 Services provided to the session layer
7.4.4 Functions within the transport layer
7.5 Network layer
7.5.1 Definitions
7.5.2 Purpose
7.5.3 Services provided to the transport layer
7.5.4 Functions within the network layer
7.6 Data link layer
7.6.1 Definitions
7.6.2 Purpose
7.6.3 Services provided to the network layer
7.6.4 Functions within the data link layer
7.7 Physical layer
7.7.1 Definitions
7.7.2 Purpose
7.7.3 Services provided to the data link layer
7.7.4 Functions within the physical layer
ANNEX A – Brief explanation of how the layers were chosen
ANNEX B – Alphabetical index to definitions