Juniper E Series User Manual

E-series Hardware Guide
20 ! Redundancy Features
Fans
Forced air-cooling keeps the temperature of the E-series modules and components
within normal operating limits. In ERX-14xx models, six cooling fans are located in
a tray at the top of the router (see Figure 4). In ERX-7xx models, four cooling fans
are located in a tray on one side of the router (see Figure 6). In the ERX-310 router,
two cooling fans are located in a tray on one side of the router (see Figure 8).
The system monitors the temperature of each module. If the temperature of a
module exceeds the maximum limit, the system immediately goes into thermal
protection mode. In this mode, the modules consume extremely low levels of
power. For information about troubleshooting high operating temperatures, see
Chapter 10, Troubleshooting.
In ERX-7xx/14xx models, the fan tray has two redundant converters that power the
fans (for the ERX-14xx models, a –24 V, 50 W converter; for the ERX-7xx models, a
–12 V, 15 W converter). If one converter fails, the other takes over. The ERX-310
router does not have redundant converters.
For all E-series routers, the system software reports an alarm if any of the fans or
converters fail.

Juniper E Series Specifications

General

Brand	Juniper
Model	E Series
Category	Network Router
Language	English