Figure 321: T320 Router Cooling System And Airflow - Juniper M Series Monitoring And Troubleshooting Manual

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T320 Router Redundant Cooling System Components

Figure 321: T320 Router Cooling System and Airflow

Checklist for Monitoring Redundant Cooling System Components on page 623

The T320 router cooling system includes:

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.

The cooling system has redundant components, which are controlled by the host

subsystem. If one of the fans fails, the host subsystem increases the speed of the

remaining fans to provide sufficient cooling for the router indefinitely.

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, the

speed of the remaining fans is automatically adjusted to keep the temperature within

the acceptable range. Cooling system components can be removed and replaced without

powering down or disconnecting power to the

T320 router cooling system components.

Chapter 31: Monitoring Redundant Cooling System Components

router.Figure 322 on page 636