Table 12: Airflow Direction in EX4650 Switch Models (continued)
Direction of AirflowFan Modules and Power SupplyModel Number
Back-to-front—that is, air intake to cool
the chassis is through the vents on the rear
panel of the chassis and hot air exhausts
through the vents on the front panel of
the chassis.
The switch ships with five fan modules and
two AC power supplies, each with a label
AIR IN (AFI).
EX4650-48Y-AFI
Front-to-back—that is, air intake to cool
the chassis is through the vents on the
front panel of the chassis and hot air
exhausts through the vents on the rear
panel of the chassis.
The switch ships with five fan modules and
two DC power supplies, each with a label
AIR OUT (AFO).
EX4650-48Y-DC-AFO
Back-to-front—that is, air intake to cool
the chassis is through the vents on the rear
panel of the chassis and hot air exhausts
through the vents on the front panel of
the chassis.
The switch ships with five fan modules and
two DC power supplies, each with a label
AIR IN (AFI).
EX4650-48Y-DC-AFI
CAUTION: Do not mix:
•
Do not mix:
•
AC and DC power supplies in the same chassis.
•
Power supplies with different airflow labels (AFI and AFO) in the same chassis.
•
Power supplies and fan modules with different airflow labels (AFI) and (AFO)) in the
same chassis.
Front-to-Back Airflow
In the EX4650 switch models that have front-to-back airflow, the air intake to cool the chassis is through
the vents on the front panel of the switch and hot air exhausts through the vents on the rear panel (See
Figure 14 on page 37).
36
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