Juniper Networks ERX-1410 - Manual (Page 35)

The Next Step
ERX Edge Routers
1-15
Fans
Forced air-cooling keeps the temperature of the ERX modules and
components within normal operating limits. In the ERX-1400 series, six
cooling fans are located in a tray at the top of the system (see
Figure 7-5 ).
In the ERX-700 series, four cooling fans are located in a tray on one side
of the system (see
Figure 7-7 ).
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 8, Troubleshooting .
The fan tray has two redundant converters that power the fans (for the
ERX-1400 series, a –24 V, 50 W converter; for the ERX-700 series, a
–12 V, 15 W converter). If one converter fails, the other takes over. In
addition, the system software reports an alarm if any of the fans
overrotate or underrotate or if one of the converters fails.
The Next Step
Go to Chapter 2, Installing the ERX System .