CHAPTER 1
ERX System Overview
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Figure 1-10 Data flow when a spare line module is active
For information about installing modules for line module redundancy, see
Chapter 3, Installing ERX Modules. For information about configuring
and managing SRP module redundancy, see ERX System Basics
Configuration Guide, Chapter 5, Managing Line Modules and SRP
Modules, for more information.
Power
The system provides a power architecture that distributes redundant
–48 VDC feeds through the system to each line module, SRP module,
and fan module where DC-to-DC converters provide local conversion to
the required secondary voltages. The system design prevents a failure of
any one of the power components from causing any other component in
the system to fail.
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Midplane
Redundancy
midplane
Primary
line module
Spare
line module
Redundancy
I/O module
Primary
I/O module
A packet arrives at the primary
I/O module.
The packet passes along the
redundancy midplane from the
primary I/O module to the
redundancy I/O module.
The packet passes from the
redundancy I/O module to the
spare line module.
The spare line module
processes the packet.
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