Power - Juniper E SERIES BROADBAND SERVICES ROUTERS 11.3.X - ERX HARDWARE GUIDE REV 26-9-2010 Hardware Manual

ERX 11.3.x Hardware Guide

Power

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The process by which the system switches to the spare line module is called switchover.
When switchover occurs, the system:
Breaks the connection between the primary I/O module and the primary line module.
1.
Connects the primary I/O module to the spare line module via the redundancy midplane
2.
and redundancy I/O module.
Protocol processing then takes place on the spare line module.
Figure 12 on page 16 shows the data flow when a spare line module becomes active.
Figure 12: Data Flow When a Spare Line Module Is Active
For information about installing modules for line module redundancy, see "Installing
Modules" on page 31. For information about configuring and managing SRP module
redundancy, see JunosE System Basics Configuration Guide, Chapter 6, Managing Modules.
All E Series routers provide a power architecture that distributes redundant –48 VDC
feeds through the router to each line module, SRP module, and fan module where
DC-to-DC converters provide local conversion to the required secondary voltages.
The ERX310 router is available with either DC or AC power inputs. The AC-powered version
can be configured with one or two hot-swappable power supplies for optional redundancy.
Copyright © 2010, Juniper Networks, Inc.