Figure 36: AC PSM in ACX5448-D and ACX5448-M Routers
The PSMs provide FRU-to-port or port-to-FRU airflow depending on the product model you purchase.
The PSMs either have labels on the handles that indicate the direction of airflow or have color-coded
handles with a fan icon. A PSM with the label AFI or a blue handle denotes FRU-to-port airflow. A PSM
with the label AFO or a gold-colored handle denotes port-to-FRU airflow.
CAUTION: Verify that the airflow direction on the PSM handle matches the direction
of airflow in the chassis. Ensure that each PSM that you install in the chassis has the
same airflow direction. If you install PSM with two different airflow directions, Junos
OS raises an alarm. If you need to convert the airflow pattern on a chassis, you must
replace all the fans and PSMs at one time to use the new direction.
Table 18 on page 54 and Table 19 on page 55 show the different PSMs and their direction of airflow.
Table 18: Airflow Direction in AC PSM for ACX5448
Color of Power
Supply Module
HandleDirection of AirflowWattagePower Supply Modules
Juniper Azure BlueAirflow in (back-to-front)650 WJPSU-650W-AC-AFI
Juniper GoldAirflow out
(front-to-back)
JPSU-650W-AC-AFO
54
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