Power - Juniper E Series Hardware Manual

ERX 7.0.x Hardware Guide
Figure 15: Data Flow When a Spare Line Module Is Active
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 5, Managing Line Modules and SRP 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 8 and Figure 9). The power supplies convert AC power to
internal –48 V redundant DC feeds that are then distributed through the router.
20
Redundancy Features

Spare line module
Primary line module
Redundancy
I/O module
Ž
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.
Primary
I/O module
Œ
Midplane
Redundancy
midplane
