M40e and M160 Router Cooling Systems
The M40e and M160 router cooling system has the following components:
- Air intake vent, air filter, and intake cover—Provide an opening for room air to enter the router. They are located at the bottom of the chassis front, below the cable management system, as shown in Figure 113. The air filter is removable and covers the air intake vent, preventing dust and other particles from entering the cooling system. For maintenance and replacement instructions, see the M40e or M160 router hardware guide. The nonremovable air intake cover is located behind the air filter and provides EMC shielding.
- Front cooling subsystem—Cools the FPCs, PICs, and midplane. It includes a fan tray located behind the cable management system and a large, central impeller behind the craft interface. For replacement instructions, see the M40e or M160 router hardware guide.
- Rear cooling subsystem—Cools the Switching and Forwarding Modules (SFMs), host module, Packet Forwarding Engine Clock Generator (PCGs), and power supplies. It includes one impeller located at the upper right of the chassis rear and another at the lower left. The upper and lower impellers are not interchangeable. For replacement instructions, see the M40e or M160 router hardware guide.
Figure 113 shows the M40e and M160 router cooling system components.
The cooling system draws in room air through the air intake vent located at the front of the chassis below the cable management system. After entering the chassis, the air stream separates into separate flows for the front and rear subsystems, and the Miscellaneous Control Subsystem (MCS) monitors the temperature of each flow independently.
Figure 114 shows the M40e and M160 router cooling system components and airflow.
