Understanding the Cooling System ! 255
Chapter 19: Monitoring the Cooling System
M20 Router Cooling System
The M20 router cooling system consists of the following components (see
Figure 108):
! Three front fan trays—Cool the Flexible PIC Concentrators (FPCs) and the
System and Switch Boards (SSBs). The fan trays are located on the left front
side of the chassis. Each tray houses three fans.
! Routing Engine fan tray—Cools the Routing Engines. The fan tray is located
behind the Routing Engine panel. It houses two fans.
! Power supply integrated fan—Cools each power supply. It is built into the
supply.
Figure 108: M20 Router Cooling System Components
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Front fan tray(s) Rear fan tray
Upper fan
Middle fan
Bottom fan
RearFront
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