Cisco NCS 4201 Installing Manual page 10

Removing the Fan Tray
Step 2
Secure the fan tray to the chassis using the attached captive installation screws. The recommended maximum torque is
5.5 in.-lb (.62 N-m).
Figure 8: Installing the Fan Tray on Cisco NCS 4201
This completes the procedure for installing or replacing the fan tray in a Cisco NCS 4201.
For more information about air flow guidelines, see the
Removing the Fan Tray
The fan tray supports online insertion and removal (OIR). There is no need to power down the Cisco NCS
4201 to remove or replace the fan tray. However, the chassis will shut down if the fan tray is removed from
the chassis for more than five minutes.
The chassis can stay active for up to 5 minutes if the temperature is below the ambient limit. However, in
Caution
the event of an overtemperature alarm, the chassis can shut down in less than 5 minutes. In the event of
a critical temperature alarm, the chassis shuts down immediately.
Cisco NCS 4201 Hardware Installation Guide
10
Air Flow Guidelines section.
Installing the Cisco NCS 4201