•
Air intake vent and air filter (see Figure 160 on page 324)—Provide an opening for room
air to enter the router. They are located at the bottom of the chassis front, below the
craft interface. The air filter prevents dust and other particles from entering the cooling
system. For replacement instructions, see the M40 router hardware guide.
CAUTION: Do not remove the air filter for more than a minute while the
router is operating. The fans and impellers are powerful enough to draw in
foreign material, such as bits of wire, through the unfiltered air intake, which
could damage router components.
•
Upper and lower impeller assemblies (see Figure 159 on page 323)—Cool the Packet
Forwarding Engine components (backplane, SCB, FPCs, and PICs). The lower impeller
assembly is located behind the craft interface at the front the chassis, and the upper
assembly is located above the fan tray at the rear of the chassis. Each assembly houses
two impellers for redundancy. The assemblies are not interchangeable. For replacement
instructions, see the M40 router hardware guide.
•
Fan tray (see Figure 160 on page 324)—Cools the Routing Engine and backplane. The
tray houses three fans for redundancy and is located above the Routing Engine at the
upper rear of the chassis.
•
Power supply integrated fan—Cools the power supply. It is not field-replaceable.
Figure 159 on page 323 shows the M40 router cooling system impeller trays.
Figure 159: M40 Router Impeller Trays
Figure 160 on page 324 shows the M40 router air filter and fan tray.
323Copyright © 2012, Juniper Networks, Inc.
Chapter 11: Monitoring the Cooling System
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