Figure 157: M20 Router Cooling System Components; Figure 158: M20 Router Cooling System And Airflow - Juniper M Series Monitoring And Troubleshooting Manual

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M Series and T Series Routers Monitoring and Troubleshooting Guide

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M40 Router Cooling System

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 157: M20 Router Cooling System Components

The cooling system includes several fan trays that draw room air into the chassis to keep

its internal temperature below a maximum acceptable level. The cooling subsystems

have redundant components, which are controlled by the SSB. If a fan fails, the remaining

fans provide sufficient cooling for the unit indefinitely (see

Checklist for Monitoring the Cooling System on page 317

The M40 router cooling system consists of the following components:

Figure 158 on page