Mx10003 Cooling System Description; Fan Modules - Juniper MX10003 Hardware Manual

MX10003 Cooling System Description

IN THIS SECTION

Fan Modules | 31

Airflow | 33
Air Filter Unit | 33
Power Supply Cooling System | 34
The cooling system components work together to keep all router components within the acceptable
temperature range.
The cooling system consists of the following components:
Fan Modules
The chassis monitors the temperature of the router components. When the router is operating normally,
the fans function at lower than full speed. If a fan fails or the ambient temperature rises above a threshold,
the speed of the remaining fans is automatically adjusted to keep the temperature within the acceptable
range. If the ambient maximum temperature specification is exceeded and the system cannot be adequately
cooled, the Routing Engine shuts down the router by disabling output power from each power supply.
The router has four fan modules that install vertically at the rear of the router. Each fan module contains
two counter-rotating fans. The fan modules are hot-insertable and hot-removable field-replaceable units
(FRUs) (see Figure 7 on page 32).
31