Figure 318: M120 Router Cooling System And Airflow - Juniper M Series Monitoring And Troubleshooting Manual

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M320 Router Redundant Cooling System Components

Front air filter

The cooling system components work together to keep all router components within the

acceptable temperature range. All fan trays and filters are hot-insertable and

hot-removable. The two front fan trays are interchangeable. The front and rear fan trays

are not interchangeable.

Figure 318 on page 633

Figure 318: M120 Router Cooling System and Airflow

The host subsystem monitors the temperature of the router components. When the

router is operating normally, the fans function at lower than full speed. If a fan fails or

the ambient temperature rises above a threshold, the speed of the remaining fans is

automatically adjusted to keep the temperature within the acceptable range. If the

ambient maximum temperature specification is exceeded and the system cannot be

adequately cooled, the Routing Engine shuts down the system by disabling output power

from each PEM.

Checklist for Monitoring Redundant Cooling System Components on page 623

The M320 router includes the following cooling system components:

Two front fan trays

Front air filter

Rear fan tray

Rear air filter

The cooling system components work together to keep all router components within the

acceptable temperature range. All fan trays and filters are hot-insertable and

hot-removable. The two front fan trays are interchangeable. The front and rear fan trays

are not interchangeable.

Figure 319 on page 634

shows the M320 router cooling system airflow.

Chapter 31: Monitoring Redundant Cooling System Components

shows the M120 router cooling system