SRX5400 Cooling System

The cooling system consists of the following components:

• Fan tray

• Air filter

The cooling system components work together to keep all firewall components within the acceptable temperature range (see Figure 1, Figure 2, and Figure 3 ). The device has one fan tray and one air filter that install vertically in the rear of the device.

Two types of fan trays are available:

• The standard capacity fan tray has three fans that operate at 216 cubic feet per minute (CFM) at full speed and is adequate for firewalls in which standard-capacity power supplies are installed.

• The high-capacity fan tray has three fans that operate at 289 cubic feet per minute (CFM) at full speed and is required when high-capacity power supplies are installed.

The air intake to cool the chassis is located on the side of the chassis next to the air filter. Air is pulled through the chassis toward the fan tray, where it is exhausted out the side of the system. The air intake to cool the power supplies is located in the front of the device above the craft interface. The exhaust for the power supplies is located on the rear bulkhead power supplies.

Each fan has an LED that displays its status. The fan LEDs are located on the top left of the craft interface.

Figure 1: Airflow Through the Chassis

The host subsystem monitors the temperature of the firewall components. When the device is operating normally, the fans function at lower than full 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 Routing Engine shuts down the system by disabling output power from each power supply.

Figure 2: Fan Tray

Figure 3: Air Filter