Figure 159: M40 Router Impeller Trays - Juniper M Series Monitoring And Troubleshooting Manual

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Figure 159: M40 Router Impeller Trays

Air intake vent and air filter (see

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.

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

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

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 160 on page 324

shows the M40 router air filter and fan tray.

Chapter 11: Monitoring the Cooling System

Figure 160 on page

324)—Provide an opening for room

Figure 159 on page

324)—Cools the Routing Engine and backplane. The

323)—Cool the Packet