M20 Router Redundant Cooling System Components
The M20 router cooling system includes:
- Three front fan trays—Cool the Flexible PIC Concentrators (FPCs) and the System and Switch Board (SSB). These fan trays are located on the left front side of the chassis.
- One rear fan tray—Cools the Routing Engine. This fan tray is located immediately to the right of the Routing Engine.
- Power supply integrated fan—A built-in fan cools each power supply.
The four fan trays plug directly into the router midplane and work together to provide side-by-side cooling.
The fans operate in unison to maintain an acceptable operating temperature for the Routing Engine and midplane. Each cooling subsystem maintains a separate airflow, and each is monitored independently for temperature control. Figure 212 shows the M20 router cooling system components and airflow.
Both front and rear fan trays are hot-removable and hot-insertable. You can remove and replace these components without powering down the system and disrupting routing functions. Figure 213 shows the M20 router cooling system components.
