Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

Navigation
Guide That Contains This Content
[+] Expand All
[-] Collapse All

    T320 and T640 Router Cooling Systems

    The cooling system in the T320 and T640 routers consists of the following components:

    • Two front fan trays—The front fan trays each contain six fans and are interchangeable. The fan trays in the front of the chassis, each with six fans, cool the components installed in the FPC card cage (the FPCs, PICs, CIP, and midplane).
    • Rear fan tray—The rear fan tray contains five fans and is not interchangeable with the front trays. It cools the components installed in the rear card cage (the Routing Engines, Control Boards, PCGs, and SIBs).
    • Front and rear air filter—Air filters for both the front and rear fan trays help keep dust and other particles from entering the cooling system.
    • Power supply fans—The power supplies each have a fan that cools that power supply.

    During normal operation, the fans in each fan tray function at less than full capacity. Temperature sensors on the midplane and the host subsystem control the speed of the fans. A fan failure triggers the red alarm LED on the craft interface. If the temperature passes a certain threshold, the Junos OS turns off the power supplies.

    Figure 1 shows the T320 router cooling system components.

    Figure 1: T320 Router Cooling System Components

    T320 Router Cooling
System Components

    Figure 2 shows the T320 router airflow.

    Figure 2: T320 Router Cooling System and Airflow

    T320 Router
Cooling System and Airflow

    Figure 3 shows the cooling system components in T640 routers.

    Figure 3: T640 Router Cooling System Components

    T640 Router
Cooling System Components

    Figure 4 shows airflow through the T640 routers.

    Figure 4: T640 Router Cooling System and Airflow

    T640 Router
Cooling System and Airflow

    Published: 2012-08-20