Troubleshooting Subsystems - Cisco uBR905 Installation Manual

Troubleshooting Subsystems

Troubleshooting Subsystems
The key to troubleshooting is to isolate a problem to a specific subsystem:
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Figure 4-2 on the next page provides a general troubleshooting flowchart. Table 4-2 can help you
correlate LED behavior with possible problems, and suggested courses of actions.
Figure 4-2
Turn on
system power
Cisco uBR905 Router Hardware Installation Guide
4-4
Power subsystem
Coaxial cable subsystem
RF and digital signal subsystem
PC subsystem
Basic Troubleshooting Strategy for Startup Problems
No
Power
LED on?
Yes
Check the
coaxial
(CATV) cable
Coaxial
No
cable in
excellent
condition
?
Yes
Check RF
downstream
signal
Down-
stream video No
and digital signal
alignment
OK?
Yes
Check the
personal
computer
Yes
Can you
No
view the
web page?
Yes
Installation
successful
Troubleshoot
No
Power
power
LED on?
subsystem
Yes
Coaxial
Troubleshoot
No
cable in
coaxial
excellent
cable
condition
?
Yes
HFC network
problem-
troubleshoot &
service
Can you
Troubleshoot
view the
personal
web page?
computer
Yes
Chapter 4
Replace or
repair
coaxial
cable
Get computer
No
and/or network
I/F card tech
assistance
Contact your
system
administrator
Troubleshooting
OL-0598-01 (9/2000)