Juniper Networks ERX-700, ERX-1410, ERX-1440, ERX-705 manual Power

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CHAPTER 1

ERX System Overview

1A packet arrives at the primary I/O module.

2The packet passes along the redundancy midplane from the primary I/O module to the redundancy I/O module.

3The packet passes from the redundancy I/O module to the spare line module.

4The spare line module processes the packet.

Redundancy	Primary
I/O module	I/O module

1 3

Midplane

4

Redundancy

midplane

2

Spare	Primary
line module	line module

Figure 1-10Data 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.