Juniper Networks 8 manual Power, Data Flow When a Spare Line Module Is Active

ERX Overview

Figure 12: Data Flow When a Spare Line Module Is Active

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Spare line module

Primary line module

Redundancy		g013738
I/O module	Primary

Ž	I/O module
	Œ
	Midplane

Redundancy midplane

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

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

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

4.The spare line module processes the packet.

For information about installing modules for line module redundancy, see “Installing Modules” on page 35. For information about configuring and managing SRP module redundancy, see JUNOSe System Basics Configuration Guide, Chapter 6, Managing Modules.

Power

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 ERX-310 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. (See Figure 5 and Figure 6.) The power supplies convert AC power to internal –48 V redundant DC feeds that are then distributed through the router.

Redundancy Features 19