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    M40 Router Cooling System

    The M40 router cooling system consists of the following components:

    • Air intake vent and air filter (see Figure 2)—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 1)—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 2)—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 1 shows the M40 router cooling system impeller trays.

    Figure 1: M40 Router Impeller Trays

    M40 Router Impeller Trays

    Figure 2 shows the M40 router air filter and fan tray.

    Figure 2: M40 Router Air Filter and Fan Tray

    M40 Router Air Filter
and Fan Tray

    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 3 shows the M40 router cooling system airflow.

    Figure 3: M40 Router Cooling System and Airflow

    M40 Router Cooling System
and Airflow
     
     

    Published: 2012-08-20