Cooling System and Airflow in a QFX3100 Director Device

The cooling system in a QFX3100 Director device consists of three fan modules as well as a single fan in each AC power supply. The fan modules are located in the fan module slots on the rear of the QFX3100 Director device.

The QFX3100 Director device provides front to back airflow. See Figure 1.

Figure 1: Airflow Through the QFX3100 Director Device

Temperature sensors in the chassis monitor the temperature within the chassis. The system raises an alarm if the fan fails or if the temperature inside the chassis rises above permitted levels. If the temperature inside the chassis rises above the threshold, the system shuts down automatically.