CHAPTER 4
Cooling System Components and
Descriptions
•
MX240 Cooling System Description on page 17
•
MX240 Fan LED on page 18
MX240 Cooling System Description
The cooling system consists of the following components:
•
Fan tray
•
Air filter
The cooling system components work together to keep all router components within the
acceptable temperature range (see Figure 8 on page 17, Figure 9 on page 18, and
Figure 10 on page 18). The router has one fan tray and one air filter that install vertically
in the rear of the router. The fan tray contains three fans. The MX Series high-capacity
fan trays satisfy cooling requirements for high-density DPCs and MPCs, and must be
upgraded for proper cooling.
The air intake to cool the chassis is located on the side of the chassis next to the air filter.
Air is pulled through the chassis toward the fan tray, where it is exhausted out the side
of the system. The air intake to cool the power supplies is located in the front of the router
above the craft interface. The exhaust for the power supplies is located on the rear
bulkhead power supplies.
Figure 8: Airflow Through the Chassis
The host subsystem 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
17Copyright © 2017, Juniper Networks, Inc.
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