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Router Cooling and Airflow Requirements
The ACX5448 router is available with either front-to-back airflow (air out, ports-to-FRUs or AFO), or back-to-front airflow (air
in, FRUs-to-ports or AFI). In AFO models, the air is pulled through the front of the chassis toward the fan trays, from where it
is exhausted out of the system. Whereas in AFI models, the air is pulled through the fan trays and towards the front of the
chassis, from where it is exhausted out of the system. The fan modules and the power modules are available in both AFO and
AFI variants.
Figure 6
and
For the cooling system to function properly, the airflow around the chassis must be unrestricted. Allow at least 6 in. (15.2 cm)
of clearance between side-cooled routers. Allow 2.8 in. (7 cm) between the side of the chassis and any non-heat-producing
surface such as a wall.
The power supplies are self-cooling and are located in the rear of the router. The exhaust for the power supplies are also located
on the rear of the chassis.
The rack or cabinet must have an adequate supply of cooling air.
Figure 6: Airflow Through the ACX5448 Router—AFO
Por t s
Figure 7: Airflow Through the ACX5448 Router—AFI
Por t s
CAUTION:
Do not mix different types of airflow modules in the same chassis. The fan and power modules must be
of same airflow type (AFO or AFI).
Copyright © 2018, Juniper Networks, Inc.
Figure 7
show the airflow through the two router models.
ACX5448 Universal Metro Router Quick Start Guide
FRUs
FRUs
5
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