1 CHAPTER OVERVIEW
Redundancy is transparent backup. It is required where a single point of failure cannot be tolerated, so is
required in critical applications such as substation automation. Redundancy acts as an insurance policy,
providing an alternative route if one route fails.
The Redundant Ethernet Board (REB) assures "bumpless" redundancy at the intelligent electronic device
(IED) level. "Bumpless" in this context means the transfer from one communication path to another without
noticeable consequences.
This chapter contains the following sections:
Chapter Overview 241
Board Versions 242
Board Connections 243
Redundancy Protocols 244
Generic Functions for Redundant Ethernet Boards
252
Configuring IP Addresses 258
PRP Configurator 262
RSTP Configurator 265
Switch Manager 269
MiCOM P747 Chapter 8 - Redundant Ethernet
P747-TM-EN-1 241
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