MX960 Cooling System Description

The cooling system consists of the following components:

• Upper front fan tray
• Lower front fan tray
• Front air filter

The cooling system components work together to keep all router components within the acceptable temperature range (see Figure 1, Figure 2, Figure 3, and Figure 4). The router has two fan trays located in the front of the router that install horizontally above and below the card cage. Each fan tray contains six fans. The high-capacity fan tray contains twelve fans. The fan trays are interchangeable and are hot-insertable and hot-removable.

The MX Series high-capacity fan trays satisfy cooling requirements for high-density DPCs and MPCs, and must be upgraded for proper cooling. Additionally, for the MX960 router, you must upgrade both fan trays and the filter tray

Figure 1: Airflow Through the Chassis

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 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 PEM.

There is a single air intake in the front of the router. Air is pushed up through the DPC card cage and through the upper fan tray where it combines in a common exhaust plenum and is exhausted out the upper rear of the system.

Figure 2: Upper Fan Tray

Figure 3: Air Filter

Figure 4: Air Filter Tray

Figure 5: High-Capacity Fan Tray

Figure 6: High-Capacity Filter Tray with Air Filter