Power Subsystem - Cisco uBR905 Installation Manual

Troubleshooting Subsystems
Table 4-2
LED
US
DSNR

Power Subsystem

To help isolate a problem with the Cisco uBR905 router power subsystem, look at the OK LED. Does
the LED remain on when self-test is finished 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.
Cisco uBR905 Router Hardware Installation Guide
4-6
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 that 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 comes 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.
Chapter 4
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 that
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.
OL-0598-01 (9/2000)
Troubleshooting