JUNOS Internet Software Network Operations Guide: Hardware
258 ! Understanding the Cooling System
The M40 router cooling system consists of separate subsystems (sets of fans and
impellers) that draw room air into the chassis to keep its internal temperature below
a maximum acceptable level. After entering the chassis, the air stream separates
into separate flows for the front and rear subsystems, and the temperature of each
flow is monitored independently. Figure 112 shows the M40 router cooling system
airflow.
Figure 112: M40 Router Cooling System and Airflow
Power supply
and Fans
Lower impellers
Packet
Forwarding
Engine
Upper impellers
Routing
Engine
Fan tray
Backplane
Air intake for
power supply cooling
Air intake for
Routing Engine cooling
Exhaust for Routing
Engine and backplane
cooling
Air intake for
Packet Forwarding
Engine cooling
Front
of Chassis
Rear
of Chassis
Exhaust for
power supply
Exhaust for
Packet Forwarding
Engine cooling
1771
Top impeller
Bottom impeller
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