Chapter 4 Troubleshooting the Installation
Troubleshooting the Cooling Subsystem
Troubleshooting the Line Cards
As each line card powers on, a
Check the following to help isolate a problem with the line cards:
•Are both banks of alphanumeric LED displays on?
–The two displays are powered separately. The left display receives power from the
–If both displays are on, check the message being displayed. As soon as the
The system attempts to boot identical line cards in parallel. Further, the system boots line cards as soon as they are powered on and become available for backup.
During the line card boot process, which occurs immediately after the RP boot process, you can observe the alphanumeric LED displays on each line card. For additional information about the displays and definitions, see the Cisco IOS XR Troubleshooting Guide (see “Obtaining Documentation, Obtaining Support, and Security Guidelines” section on page
Troubleshooting the Cooling Subsystem
The Cisco XR 12404 router has a fan tray assembly located on the left side of the chassis when you are facing the front of the chassis. The fan tray assembly assembly provides cooling air for the router components. The fan tray assembly receives power and signals though a connector mounted on the fan tray, which mates with a connector mounted on the backplane.
The fan tray assembly contains:
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