Cabletron Systems 520 - Manual (Page 78)

Problem Solving
A-8
Network OK
LED does not
stay on after the
functional code
begins
execution. The network interface
self-test has failed. Refer to the SmartSwitch
Router 500 Series System
Software Guide to determine
the network interface status
and to display any logged
network interface events.
Network
Activity LED is
off. There is low network
activity or no network
activity. Ensure that there is network
activity. If the Network
Activity LED still fails to turn
on, then turn the unit off
momentarily by removing it
from the power supply. Check
that the Network Activity LED
blinks momentarily during the
LED powerup self test.
If the router is
connected to a known
active segment and the
Network Activity LED
is off, then the router is
defective. Replace the router.
Serial Port 1 or
Serial Port 2 OK
LED does not
stay on after the
functional code
begins
execution. Serial Port 1 or 2
interface self-test has
failed. Refer to the SmartSwitch
Router 500 Series System
Software Guide to determine
the serial port interface status
and to display any logged serial
port interface events.
Continued on next page ...
Table A-3. LED States
Symptom Probable Cause Corrective Action