Power Subsystem - Cisco uBR924 Installation Manual
Cable access router
Hide thumbs
Also See for uBR924:
- Troubleshooting tips (74 pages) ,
- Installation and startup (34 pages) ,
- Configuration manual (52 pages)
Table of Contents
Advertisement
Chapter 4
Troubleshooting
Table 4-2
LED
US
DSNR
Power Subsystem
To help isolate a problem with the Cisco uBR924 router power subsystem, look at the OK LED. Does
the LED remain on when self-test is completed and a software image booted?
•
•
Note
If you are unable to resolve the problem or you determine that either a power supply or
cable access router connector is faulty, contact your field office for instructions.
OL-0338-01 (3/2000)
General Troubleshooting Tips (continued)
Status
Possible Problem
Upstream LED
Upstream signal is not
is off.
reaching the headend; router is
unable to communicate with
the remote end. Systematic RF
noise problem or other outage.
Downstream
Systematic RF noise problem
signal-to-noise
or other outage.
LED is off.
If yes, the power source is good and the power supply is functional.
If no, make sure the power cable is connected at the back of the router and that the power supply is
properly connected to power at the wall outlet.
–
If the OK LED remains off but other LEDs are ON, check for possible diagnostic codes.
If the OK LED remains off and all other LEDs are also OFF, check the power source or power
–
supply. Connect the power cord to another power source, if available. If the LED goes on, the
problem is the first power source.
–
If the OK LED fails to blink after you connect the power cord to a new power source, the power
supply is probably faulty.
Troubleshooting Subsystems
Suggested Action
Verify continuity back to the headend
using the standard procedures for your
system. Temporarily locate the router
closer to the ground block, the tap, or
another tap closer to the headend—
ensuring correct RF input level at all
times.
Verify correct RF input to the router.
Temporarily locate the router closer to
the ground block, the tap, or another tap
closer to the headend—ensuring correct
RF input level at all times.
Do not install the router unless your
system management expressly states this
is the procedure to follow. This is an
early indication of low quality cable
signals and indicates a high likelihood of
intermittent router operation.
Cisco uBR924 Router Hardware Installation Guide
4-7
Advertisement
Table of Contents
Troubleshooting
