The cooling system consists of a fan tray containing four fans (SRX 3400) or 10 fans (SRX 3600) and an air filter. These components work together to keep all services gateway components within the acceptable temperature range. The services gateway has one fan tray located in the rear of the device that installs vertically to the right of the card cage. The fan tray is hot-insertable and hot-removable.
Figure 1: SRX 3400 Fan Tray
Figure 2: SRX 3600 Fan Tray
From the front of the chassis, there is a single air intake on the left side of the services gateway. Air is pushed from the fan tray through the air filter and then to the card cage. The air is exhausted out the right of the system. Figure 3 illustrates the air flow from the top of the chassis and the front of the chassis.
Figure 3: Airflow Through the Chassis
The RE monitors the temperature of the device components. Above an ambient temperature of 30° C, the fans operate at full speed. Below 30° C, the fans operate at a reduced speed. If a fan fails or the ambient temperature rises above a threshold, the speed of the remaining fans is automatically adjusted to keep the temperature within the acceptable range. If the ambient maximum temperature specification is exceeded and the system cannot be adequately cooled, the RE shuts down the system by disabling output power from each power supply.