08/30193922 DC : 0

1 Scope
2 Normative references
3 Terms, definitions, abbreviated terms,
  acronyms, and conventions
  3.1 Terms and definitions
  3.2 Abbreviated terms and acronyms
  3.3 Conventions
  3.4 Reserved network addresses
4 Conformance Requirements (normative)
  4.1 Conformance to redundancy protocols
  4.2 Conformance tests
5 Concepts for high availability automation
  networks (informative)
  5.1 Characteristics of application of
      automation networks
  5.2 Generic network system
  5.3 Safety
  5.4 Security
6 Classification of networks (informative)
  6.1 Notation
  6.2 Classification of robustness
7 Availability calculations for selected
  networks (informative)
  7.1 General
  7.2 Generic symmetrical reliability model
  7.3 Availability of selected structures
  7.4 Caveat
8 RSTP for High Availability Networks: Configuration
  rules, calculation and measurement method for
  deterministic recovery time in a ring topology
  8.1 General
  8.2 Deployment and configuration rules for the
      ring topology
  8.3 Calculations for fault recovery time in a ring
  8.4 Timing measurement method
Bibliography

BS EN 62439