Specifications

Hardware Reference 29
C613-03059-00 REV F
Troubleshooting
This section provides information on how to detect and resolve problems with
AT-9800 Series switches and their expansion options.
Other sources of useful troubleshooting information are:
■ www.alliedtelesis.com/support/software.
■ The AT-9800 Series AlliedWare™ Operating System Software Reference.
Check these first
1. Check the power cord connections.
2. Check that the power supply voltage is stable.
3. Check that the correct data cables are being used and that their connections
are secure.
4. Check that any GBICs are correctly installed and that they are compatible
with the switch. See “Gigabit Interface Converters (GBICs)” on page 10 for
more information.
5. Make sure that other network devices are working properly.
6. Use the show install command to check that the latest software release is
loaded. See the AT-9800 Series AlliedWare™ Operating System Software
Reference for more information about obtaining the latest software release.
7. If the switch is malfunctioning, reboot it by pressing the recessed RESET
button or entering the command restart reboot. Alternatively, shut down
and restart the switch using its power switch (AC models) or as appropriate
(DC models).
Common problems and how to solve them
Link/Activity LED on
any port is off
This can indicate:
■ a loose data cable
■ the device at the other end of the connection is not working properly or is
turned off
■ the data cable is not wired correctly
■ the network administrator has manually disabled the port through the
software
■ the port’s selected transmission mode does not match that of the attached
device
Perform the following steps in sequence:
1. Make sure the data cable connections are secure.
2. Make sure the device at the other end of the connection is switched on and
working properly.
3. Check that the data cable is wired correctly.
4. If you can, log in and check the port status. See “To log In” on page 23 for
more information on how to log in.