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Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
OL-17309-02
Chapter6 Troubleshooting
Problem Solving with Subsystems

Figure6-1 Troubleshooting Strategy for Startup Problems

Problem Solving with Subsystems

Tip Isolating a problem to a specific subsystem simplifies the troubleshooting process.

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.

•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.

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.

Caution A cable interface line card that is partially installed in the midplane can the cause system to hang and

crash.

Turn on
system power
DC OK
LED on?
No No
Yes Yes
Yes
Yes
Yes
Troubleshoot
power
subsystem
Fans
operating?
Troubleshoot
cooling
subsystem
Check system
state with I/O
controller LEDs
Troubleshoot I/O
controller
and restart
Troubleshoot
port adapters
and restart
System
startup
successful
Obtain
technical
assistance
End
Check system
state with
interface card
LEDs
Interface card
LEDs OK?
Reseat cable
interface
cards and
restart
Check the
headend
setup
Troubleshoot
headend
setup for
RF and data
Digital
data
connections
enabled?
Cable interface
card
LEDs OK?
No Fans
operating?
No
DC OK
LED on?
No No
No No
Yes
I/O
controller
LEDs
OK
I/O
controller
LEDs
OK
Check system
state with port
adapter LEDs
Yes
Yes
Port
adapter
enabled
LEDs
on?
Port
adapter
enabled
LEDs
on?
No
No
Digital
data
connections
enabled?
No
No
End
End
Yes
Yes
62742
Yes