4-5
Cisco uBR905 Router Hardware Installation Guide
OL-0598-01 (9/2000)
Chapter 4
Troubleshooting
Troubleshooting Subsystems
Table 4-2
General Troubleshooting Tips
LED
Status
Possible Problem
Suggested Action
OK
System status
LED is off.
Power cord not properly
seated.
Power outlet not operating.
Power supply has failed.
The router failed its self-test.
Check power connections.
Check the outlet.
Contact field service dispatch to replace
the power supply.
See Table 4-1 or contact field service
dispatch to replace the unit.
1, 2, 3,
or 4
Ethernet LEDs
are off when
data is
transmitted
to/from the
device.
PC/device not powered on.
Bad Ethernet connection.
Incorrect cable between the
router, the hub if applicable
and the PC.
Faulty Ethernet card.
Verify that the PC/device is powered on.
Reseat the Ethernet cable at both ends.
Make sure that TCP/IP software is
installed and DHCP is enabled.
Replace the cable, reviewing the hub
user guide or Ethernet user guide.
Notify the subscriber to replace the
Ethernet card.
LINK
Cable RF LED
is off.
Cable RF LED
is blinking.
Router searching for a signal;
RF levels wrong.
Cable is out.
Router is locked to a signal and
connecting to the headend per
DOCSIS.
Check for a DOCSIS system signal and
verify that the nearby analog video
signal is within the correct range—0 to
+15 dBmV for most coaxial cable CATV
systems.
Check if the cable TV is working if the
subscriber also subscribes to broadcast
TV services.
Wait until the router completes
initialization. The router can temporarily
pause on a digital video signal during
installation, but eventually will time out
and locate the DOCSIS system signal.
DS
Downstream
LED is off.
RF coaxial cable is not
properly connected to the
router.
Reconnect the cable.
