Troubleshooting the line cards, Troubleshooting the cooling subsystem – Cisco XR 12404 User Manual
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Chapter 4 Troubleshooting the Installation
Troubleshooting the Cooling Subsystem
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Cisco XR 12404 Router Installation Guide
OL-13830-02
Troubleshooting the Line Cards
As each line card powers on, a power-on self-test (POST) is performed on the line
card memory. A full set of field diagnostics can also be run on a line card from
the system console providing a pass/fail message both in the line card
alphanumeric LED display and on the system console.
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 DC-DC converter on the line card. The right display is powered
directly from the power supply. So, even if the line card has not powered
up, the right display could be on. If both displays are off, the line card
might not be fully plugged into the backplane connector, there might be
a problem with the MBus module on the line card, or the system power
supply may be off.
–
If both displays are on, check the message being displayed. As soon as
the DC-DC converter is turned on by the MBus module, the processor on
the line card begins the boot process. Status messages are displayed in the
alphanumeric displays as the boot process continues on the line card.
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 and Submitting a Service
).
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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