BS EN 62439-1 : 2010

INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions, abbreviations, acronyms, and
  conventions
4 Conformance requirements (normative)
5 Concepts for high availability automation networks
  (informative)
6 Classification of networks (informative)
7 Availability calculations for selected networks
  (informative)
8 RSTP for High Availability Networks: configuration
  rules, calculation and measurement method for
  deterministic recovery time in a ring topology
Bibliography
Annex ZA (normative) - Normative references to international
         publications with their corresponding European
         publications

Defines: - the common elements and definitions for other parts of the IEC 62439 series; - the conformance test specification (normative); - a classification scheme for network characteristics (informative); - a methodology for estimating network availability (informative); - the configuration rules, calculation and measurement method for a deterministic recovery time in RSTP.