CAUTION: Do not remove the air filter for more than a few minutes 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.
•
Front cooling subsystem—Cools the FPCs, PICs, and midplane. It includes a fan tray
located behind the cable management system and a large, central impeller behind
the craft interface. For replacement instructions, see the M40e or M160 router hardware
guide.
•
Rear cooling subsystem—Cools the Switching and Forwarding Modules (SFMs), host
module, Packet Forwarding Engine Clock Generator (PCGs), and power supplies. It
includes one impeller located at the upper right of the chassis rear and another at the
lower left. The upper and lower impellers are not interchangeable. For replacement
instructions, see the M40e or M160 router hardware guide.
Figure 162 on page 326 shows the M40e and M160 router cooling system components.
325Copyright © 2012, Juniper Networks, Inc.
Chapter 11: Monitoring the Cooling System
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