•
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 shows the M120 router cooling system
airflow.
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.
Related
Documentation
Checklist for Monitoring Redundant Cooling System Components on page 623•
M320 Router Redundant Cooling System Components
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.
633Copyright © 2012, Juniper Networks, Inc.
Chapter 31: Monitoring Redundant Cooling System Components
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