IEC 62439-3:2009 specifies two redundancy protocols based on the duplication of the LAN, resp. duplication of the transmitted information, designed to provide seamless recovery in case of single failure of an inter-switch link or switch in the network. This standard cancels and replaces IEC 62439 published in 2008. This first edition constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC 62439 (2008):- adding a calculation method for RSTP (rapid spanning tree protocol, IEEE 802.1Q),- adding two new redundancy protocols: HSR (High-availability Seamless Redundancy) and DRP (Distributed Redundancy Protocol),- moving former Clauses 1 to 4 (introduction, definitions, general aspects) and the Annexes (taxonomy, availability calculation) to IEC 62439-1, which serves now as a base for the other documents,- moving Clause 5 (MRP) to IEC 62439-2 with minor editorial changes,- moving Clause 6 (PRP) to IEC 62439-3 with minor editorial changes,- moving Clause 7 (CRP) to IEC 62439-4 with minor editorial changes, and- moving Clause 8 (BRP) to IEC 62439-5 with minor editorial changes,- adding a method to calculate the maximum recovery time of RSTP in a restricted configuration (ring) to IEC 62439-1 as Clause 8,- adding specifications of the HSR (High-availability Seamless Redundancy) protocol, which shares the principles of PRP to IEC 62439-3 as Clause 5, and- introducing the DRP protocol as IEC 62439-6. This bilingual version (2016-07) corresponds to the English version, published in 2012-07.
IEC 62439-3:2012 specifies two redundancy protocols designed to provide seamless recovery in case of single failure of an inter-bridge link or bridge in the network, which are based on the same scheme: duplication of the LAN, resp. duplication of the transmitted information. This second edition cancels and replaces the first edition published in 2010. It constitutes a technical revision. The main changes with respect to the previous edition are: - specification of the interconnection of PRP and HSR networks; - introduction of a suffix for PRP frames; - clarification and modification of specifications to ensure interoperability; - slackening of the specifications to allow different implementations; - consideration of clock synchronization according to IEC 61588; - introduction of test modes to simplify testing and maintenance. This publication is to be read in conjunction with IEC 62439-1:2010.
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