Cisco Nexus 9396TX Hardware Installation Manual page 14

Overview
4
Depending on whether you plan to position the ports in a hot or cold aisle, you can order the fan and power
supply modules with port-side intake or port-side exhaust airflow. For port-side intake airflow, the fan and
AC power supply modules have burgundy coloring (DC power supply modules have green coloring). For
port-side exhaust airflow, the fan and AC power supplies have blue coloring (DC power supply modules have
gray coloring). You can also order the 1200-W HVAC/HVDC power supply which has dual-direction airflow
with white coloring. Dual-direction airflow modules automatically use the airflow direction of the other
modules installed in the switch.
The fan and power supply modules are field replaceable and you can replace one fan module or one power
supply module during operations so long as the other modules are installed and operating. If you have only
one power supply installed, you can install the replacement power supply in the open slot before removing
the original power supply.
Note All of the fan and power supply modules must have the same direction of airflow. Otherwise, the switch can
overheat and shut down. If you are installing a dual-direction power supply, that module will automatically
use the same airflow direction as the other modules in the switch.
Caution
If the switch has port-side intake airflow (burgundy coloring for fan modules), you must locate the ports in
the cold aisle. If the switch has port-side exhaust airflow (blue coloring for fan modules), you must locate the
ports in the hot aisle. If you locate the air intake in a hot aisle, the switch can overheat and shut down.
Cisco Nexus 9396TX NX-OS Mode Switch Hardware Installation Guide
4
Three fan modules (2 used
for operations and one
used for redundancy) of
the following types:
Fan slots are numbered 1
(leftmost slot) to 3
(rightmost slot).
Overview