SN EN 50090-2-1 : 1994

Foreword
1 Scope
2 Normative references
3 Definitions
3.1 Definitions from EN 27498
3.2 Additional definitions
4 HBES reference model
4.1 Communication
4.1.1 Physical Layer
4.1.2 Data Link Layer
4.1.3 Network Layer
4.1.4 Transport Layer
4.1.5 Session Layer
4.1.6 Presentation Layer
4.1.7 Application Layer
4.1.8 Medium Aspects
4.2 Application
4.3 Management
4.3.1 System management
4.3.2 Application management
5 Reference points and functional groupings
5.1 General concept
5.2 Specific reference points and functional groupings
6 Standardization of interfaces at specific
       reference points
6.1 Media interface
6.2 Universal interface
6.3 Process interface
6.4 Interfaces at reference point E
7 System aspects
7.1 Network topology
7.2 Interapplication
7.3 Grouping
7.4 Access