PREN 50159 : DRAFT 2009

Foreword
Introduction
1 Scope
2 Normative references
3 Definitions
4 Reference architecture
5 Threats to the transmission system
6 Classification of transmission systems
   6.1 Scope/purpose
   6.2 General aspects of classification
   6.3 Criteria for the classification of transmission
        systems
   6.4 Relationship between transmission systems and the
        threats
7 Requirements for defences
   7.1 Introduction
   7.2 General requirements
   7.3 Specific defences
   7.4 Applicability of defences
Annex A (informative) - Threats on open transmission systems
Annex B (informative) - Categories of transmission systems
Annex C (informative) - Guideline for defences
Annex D (informative) - Guidelines for use of the standard
Annex E (informative) - Mapping from previous standards
Annex ZZ (informative) - Coverage of Essential Requirements
         of EC Directives
Bibliography

Provides the basic requirements needed to achieve safety-related communication between safety-related equipment connected to the transmission system.