Troubleshooting; What To Check First; L/A Led On A Port Is Off - Allied Telesis x900-48FE Hardware Reference Manual

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What to check first

L/A LED on a
port is off

Troubleshooting

This section provides information on how to troubleshoot the x900 series
switch and SwitchBlade x908 to resolve the following basic problems:

L/A LED on a port is off

■
Power LED is off
■
Fault LED is on
■
Check power cord connections.
■
Check that the power supply voltage is stable.
■
Check that the correct data cables are used and that their connections are
■
secure.
Make sure that other network devices work properly.
■
Check that the latest software release is loaded. The Software Reference
■
describes how to obtain the latest software release.
• On switches running the AlliedWare operating system, use the show
install command.
• On switches running the AlliedWare Plus operating system, use the
show version command.
If the switch malfunctions, reboot it using one of the following methods:
■
• use a small diameter pin to operate the recessed Reset button on the
switch's front panel
• shut down and restart the switch at the main power source (AC models)
or use the Run/Standby switch on the PSU (DC models).
• On switches running the AlliedWare operating system, use the restart
reboot command.
• On switches running the AlliedWare Plus operating system, use the
reload command.
If the Link/Activity LED is off, it may indicate the following:
a loose data cable
■
the device at the other end of the connection does not work 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
Follow these suggestions to resolve the problem:
1. Make sure the data cable connections are secure.
2. Make sure the device at the other end of the connection is powered on and
works properly.
3. Check that the data cable is wired correctly.
4. If you can, log in and check the port status. How to log in is described in the
x900 Series Switch and SwitchBlade
x900 Series Switch and SwitchBlade
®
x908 Installation and Safety Guide.
®
x908
C613-03092-00 REV J