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    T640 Router Redundant Cooling System Components

    The T640 router cooling system includes:

    • Two front fan trays
    • Front air filter
    • Rear fan tray
    • Rear air filter

    The cooling system components work together to keep all router components within the acceptable temperature range. All fan trays and filters are hot-insertable and hot-removable. The two front fan trays are interchangeable. The front and rear fan trays are not interchangeable.

    Figure 1: T640 Router Cooling System and Airflow

    T640 Router Cooling System and Airflow

    The cooling system has redundant components, which are controlled by the host subsystem. If one of the fans fails, the host subsystem increases the speed of the remaining fans to provide sufficient cooling for the router indefinitely.

    The host subsystem monitors the temperature of the router components. When the router is operating normally, the fans function at lower than full speed. If a fan fails, the speed of the remaining fans is automatically adjusted to keep the temperature within the acceptable range. Cooling system components can be removed and replaced without powering down or disconnecting power to the router.Figure 2 shows the T640 router cooling system components.

    Figure 2: T640 Router Cooling System Components

    T640 Router Cooling
System Components

    Published: 2012-08-20