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    M20 Router Redundant Cooling System Components

    The M20 router cooling system includes:

    • Three front fan trays—Cool the Flexible PIC Concentrators (FPCs) and the System and Switch Board (SSB). These fan trays are located on the left front side of the chassis.
    • One rear fan tray—Cools the Routing Engine. This fan tray is located immediately to the right of the Routing Engine.
    • Power supply integrated fan—A built-in fan cools each power supply.

    The four fan trays plug directly into the router midplane and work together to provide side-by-side cooling.

    The fans operate in unison to maintain an acceptable operating temperature for the Routing Engine and midplane. Each cooling subsystem maintains a separate airflow, and each is monitored independently for temperature control.Figure 1 shows the M20 router cooling system components and airflow.

    Figure 1: M20 Router Cooling System and Airflow

    M20 Router Cooling
System and Airflow

    Both front and rear fan trays are hot-removable and hot-insertable. You can remove and replace these components without powering down the system and disrupting routing functions. Figure 2 shows the M20 router cooling system components.

    Figure 2: M20 Router Cooling System Components

    M20 Router Cooling System
Components

    Published: 2012-08-20