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Checklist for Monitoring Redundant Cooling System Components on page 623•
T320 Router Redundant Cooling System Components
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.
Figure 321: T320 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 acceptablerange. Cooling system components can be removed and replaced without
powering down or disconnecting power to the router.Figure 322 on page 636 shows the
T320 router cooling system components.
635Copyright © 2012, Juniper Networks, Inc.
Chapter 31: Monitoring Redundant Cooling System Components
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