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A-5
Problem Solving
LED Descriptions
The router’s LEDs provide dynamic indications of the status of the router. The
LEDs can be in various states (on, off, or flashing), and can change color
(green or yellow) depending on the operational status of the router or the level
of activity on the network.
Table A-2 shows the states that are possible for each of the router’s LEDs.
Table A-2. Router LED States After Self-Test Completion
LED
Name
Off On (Green) Flashing
Power No power to
router
Router receiving
power
Faulty power
connection or
insufficient
power
Module
OK
Self-test failed Router passed self-
test
N/A
Network
OK
Ethernet port is
not connected to a
properly
terminated and
operational LAN
Ethernet port is
connected to a
properly terminated
and operational LAN
N/A
Network
Activity
No network
activity
Heavy traffic on
network
Flashes more
rapidly and
appears brighter
as network traffic
increases
Serial
Line 1
OK
Self-test failure Normal operation Self-test mode
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