Troubleshooting the Cisco 1005

4
Troubleshooting the Cisco 1005
This chapter describes how to troubleshoot the Cisco 1005 router by referring to the LEDs
on the front panel.
The LEDs indicate the current operating condition of your router. You can observe the
LEDs, note any fault conditions that the router is encountering, and then contact your
system administrator, if necessary.
Figure 4-1
POWER
LEDs
SYSTEM
SERIAL
SERIAL
LAN
LAN
OK
TX
RX
TX
RX
COLLISION
LINK
OK
H3777
CHAPT E R
Troubleshooting the Cisco 1005 4-1
Table 4-1 describes the LEDs on the Cisco 1005 router.
Table 4-1
LEDs
LED
State
Description
Power
On steadily
12 VDC is being supplied to the router.
Off
Power is not reaching the router. Verify that the power
supply is plugged into the wall receptacle, and that the
cable from the power supply to the router is connected.
On steadily
The router has passed the power-on diagnostic tests and is
working properly.
Blinking once
per second
The system LED will blink while running its startup
diagnostics and will then go on steadily. If the blinking
continues after the startup sequence, it indicates that you
are in ROM monitor mode.
Blinking six times
per second
The system is in the boot process. The blinking should
change as the system boot condition changes.
Off
An error has occurred. Disconnect the power cord, and then
reconnect it to re-establish power to your router. If the LED
remains off, contact your system administrator.
Flickering
The serial WAN connection is transmitting and receiving
data normally.
Off
The serial WAN connection is not transmitting and
receiving data normally. Check the serial cable connection.
Flickering
The Ethernet LAN connection is transmitting and receiving
data normally.
Off
The Ethernet LAN connection is transmitting and receiving
data normally or there may be no traffic on the LAN. Check
the Ethernet cable connection.
System OK
Serial TX and
Serial RX
LAN TX and
LAN RX
4-2 Cisco 1005 User Guide
LED
State
Description
Collision
(10BaseT)
On
Data collisions are being detected. Occasional collisions
are normal. If they happen often, contact your system
administrator.
Off
Data collisions are not being detected.
On
The router senses the Ethernet link integrity signal,
indicating normal operation.
Off
The router is not sensing the Ethernet link integrity signal.
Check the Ethernet cable connection.
Link OK
(10BaseT)
For more complete network troubleshooting information, refer to the Troubleshooting
Internetworking Systems publication.
Troubleshooting the Cisco 1005 4-3
4-4 Cisco 1005 User Guide