When you remove or insert an interface module while the router is powered on and running, the router does
the following:
1.
Determines if there is sufficient power for the module.
2.
Scans the backplane for configuration changes.
3.
Initializes the newly inserted module.
4.
Places any previously configured interfaces on the module back to the state they were in when they were
removed.
The router runs diagnostic tests on any new interfaces and the test results indicate the following:
• If the tests are successful it means the router is operating normally.
• If the new module is faulty, the router resumes normal operation, but leaves the new interfaces disabled.
• If the diagnostic tests fail, the router stops operating, which usually indicates that the new module has a
problem in the bus and should be removed.
To avoid erroneous failure messages, note the current configuration of all the interfaces before you remove
or replace an interface module, and allow at least 2 minutes for the system to reinitialize after a module has
been removed or replaced. This time is recommended in order to allow for synchronization between components
within the interface module and for synchronization with the RSP.
Caution
Installing and Removing the Fan Tray
The sections describe the installation and removal of fan tray on the Cisco ASR 920-24SZ-IM,
ASR-920-24SZ-M, ASR-920-24TZ-M Router.
Installing the Fan Tray
The fan tray is a modular unit that provides cooling to the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M,
ASR-920-24TZ-M Router. Follow these steps to install the fan tray in the chassis:
Procedure
Step 1
Guide the fan tray into the chassis until it is fully seated. The following figures show how to orient the fan
tray for Cisco ASR-920-24SZ-IM Router and Cisco ASR-920-24SZ-M, ASR-920-24TZ-M Router respectively.
Keep your fingers, clothing, and jewelry away from the fans. Always handle the fan tray by the
handle.
Caution
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).
Installing the Router
18
Installing the Router
Installing and Removing the Fan Tray
