Mx204 Cooling System; Mx204 Cooling System Description; Fan Trays - Juniper MX204 Hardware Manual

MX204 Cooling System

IN THIS SECTION

MX204 Cooling System Description | 29

MX204 Fan Status LED | 31
MX204 Cooling System Description
IN THIS SECTION

Fan Trays | 29

Airflow | 30
Power Supply Cooling System | 31
The cooling system components work together to keep all router components within the acceptable
temperature range.
The cooling system consists of the following features and components:
Fan Trays
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 system by disabling output power from each power supply.
The router has three fan modules (or fan trays) that install in the rear of the router. Each fan modules
contain one counter-rotating fan. The fan modules are hot-insertable and hot-removable field-replaceable
units (FRUs) (see Figure 6 on page 30).
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