Figure 319: M320 Router Cooling System And Airflow; Figure 320: M320 Router Cooling System Components - Juniper M Series Monitoring And Troubleshooting Manual

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M Series and T Series Routers Monitoring and Troubleshooting Guide

Figure 319: M320 Router Cooling System and Airflow

Figure 320 on page 634

shows the M320 router cooling system components.

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 some or all of the hardware