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Problem Solving with Subsystems
Figure 6-1
End
End
Problem Solving with Subsystems
Isolating a problem to a specific subsystem simplifies the troubleshooting process.
Tip
The first step in isolating a problem is to compare what the system is doing to what it should be doing.
Usually a startup problem is caused by a single component, so first isolating the problem to a subsystem
rather than troubleshooting every component in the entire system is more efficient. The
Cisco uBR7225VXR router subsystems are listed below.
•
•
•
The system memory and management functions reside on the network processing engine. The enabled
LED on each cable interface line card indicates if the cable interface line card is initialized.
A cable interface line card that is partially installed in the midplane can the cause system to hang and
Caution
crash.
Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
6-2
Troubleshooting Strategy for Startup Problems
Reseat cable
No
Cable interface
interface
cards and
card
restart
LEDs OK?
Yes
Digital
Troubleshoot
No
data
headend
connections
setup for
enabled?
RF and data
Yes
System
startup
successful
Power subsystem—Includes the power supplies, the external power cable, and the midplane.
Cooling subsystem—The chassis fan tray is the single component in this subsystem. The fans should
be operating whenever system power is on.
Processor subsystem—Includes the network processing engine and cable interface line cards.
Turn on
DC OK
system power
LED on?
Yes
Fans
operating?
Check system
state with
interface card
LEDs
Yes
Check system
state with I/O
controller LEDs
No
Interface card
LEDs OK?
I/O
controller
LEDs
OK
Check the
headend
setup
Yes
Check system
state with port
adapter LEDs
Digital
No
data
connections
enabled?
Port
adapter
enabled
Yes
LEDs
on?
Yes
Chapter 6
Troubleshoot
No
DC OK
power
LED on?
subsystem
Yes
Troubleshoot
No
Fans
cooling
operating?
subsystem
Yes
I/O
Troubleshoot I/O
No
controller
controller
LEDs
and restart
OK
Yes
Port
Troubleshoot
No
adapter
port adapters
enabled
and restart
LEDs
on?
Yes
Troubleshooting
No
No
No
Obtain
No
technical
assistance
End
OL-17309-01
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Troubleshooting
