Related Documentation
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 1. 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.
Caution: Do not remove the air filter for more than a few minutes while the router is operating. The fans and impellers are powerful enough to draw in foreign material, such as bits of wire, through the unfiltered air intake, which could damage router components.
- 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 1 shows the M40e and M160 router cooling system components.
Figure 1: 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 2 shows the M40e and M160 router cooling system components and airflow.
Figure 2: M40e and M160 Router Cooling System and Airflow
