Figure 323: T640 Router Cooling System And Airflow - Juniper M Series Monitoring And Troubleshooting Manual

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Figure 323: T640 Router Cooling System and Airflow

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

T640 router cooling system components.

Chapter 31: Monitoring Redundant Cooling System Components

router.Figure 324 on page 638