Caution
Ensure that the airflow direction of the power supply unit matches that of the installed fan
tray. The power supplies and fan trays are clearly labeled with either a green arrow with an
"E", or an orange arrow with an "I."
Caution
If you do not install a module or a power supply in a slot, you must keep the slot filler panel in
place. If you run the chassis with an uncovered slot, the system will overheat.
Identifying the airflow direction
The power supply and fan assemblies are identified by the following airflow directions:
• Intake power supply and fan assembly with an orange "I" label or without any label: Pulls air from the
nonport-side of the switch and exhausts it out the port side.
◦ Nonport-side air intake
◦ Port-side air exhaust
◦ Back-to-front (nonport-side to port-side)
airflow
◦ Part numbers ending with -R
• Exhaust power supply and fan assembly with a green "E" label: Pulls air from the port side of the
switch and exhausts it out the nonport-side.
◦ Nonport-side air exhaust
◦ Port-side air intake
◦ Front-to-back (port-side to nonport-side)
airflow
◦ Part numbers ending with -F
Time and items required
Installing or removing and replacing a power supply should require less than five minutes to complete.
A new power supply (with the same airflow direction as the power supply being replaced) is required to
replace a power supply.
The following items are required for the power supply replacement:
• New power supply unit or filler panel
• #2 Phillips screwdriver
Replacing a power supply
When installing or replacing a power supply unit, keep in mind the following:
• Power supplies can be swapped in or out while the device is running. The remaining power supply
provides enough power for the device.
Power Supplies
Identifying the airflow direction
ExtremeRouting SLX 9640 Hardware Installation Guide 81
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