42 Cisco 1003 and Cisco 1004 User Guide
Troubleshooting the Cisco 1003 or Cisco 1004 Router
The following table describes the LEDs.
For more complete network troubleshooting information, refer to the
Troubleshooting Internetworking Systems printed publication or UniverCD.
LED
State
Description
Power
On steadily
12 VDC is being supplied to the router and the internal
DC-to-DC converter is operational.
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. If the power
supply is working properly, the router might be defective.
System OK
On steadily
The router has passed the power-on diagnostic tests and is
working properly.
Blinking once
per second
The system LED blinks once per second when running
startup diagnostics or decompressing the software image. If
the system LED continues to blink after the startup sequence,
the router is in ROM monitor mode.
Blinking six times
per second
The system LED blinks six times per second when loading
the software image from Flash memory or a TFTP server.
Off
An error condition has occurred. Disconnect the power cord;
then reconnect it to re-establish power to your router. If the
LED remains off, contact your system administrator.
ISDN B1
On steadily
The call on the BRI B channel 1 line is connected.
ISDN B2
On steadily
The call on the BRI B channel 2 line is connected.
LAN TX
and
LAN RX
Flickering
The Ethernet LAN connection is transmitting and receiving
data normally.
Collision
(Ethernet)
On
Data collisions are being detected. Occasional collisions are
normal. If they happen often, contact your system
administrator.
Link OK
(Ethernet)
On
The router senses the Ethernet link integrity signal, indicating
normal operation.