Allied Telesis AT-8126XL - Manual (Page 40)

Troubleshooting
3-6
Power LED is
OFF
If there is no power to the switch, it cannot function.
A Power LED that is OFF may indicate:
" A loose power cord.
" Power supply failure, malfunction, or loss of power to the
power supply.
" A power supply voltage below acceptable levels.
" A high switch temperature due to fan failure or ambient
temperature extreme.
Perform the following steps in sequence; you need not proceed to
the next step if the problem is resolved:
1. Secure the power cord to the power source and check the Power
LED to see if it is ON.
2. Ensure that the voltage is within the required levels in your region.
3. Logon to Omega and run Diagnostics if you can
( Administration>Diagnostics ) and record any failures.
4. Contact Allied Telesyn’s Technical Support and report the results
of the tests.
Fault LED is ON
This might indicate problems with the network management
software, such as:
" Unsuccessful software downloads.
" Power-on diagnostics has failed.
Perform the following steps in sequence; you need not proceed to
the next step if the problem is resolved:
1. Reset the switch either by:
— Pressing the Reset button on the front panel, or
— Selecting Administration>Reset and
restart the system from Omega, if you can.
2. Make sure the RS232 connection from the local terminal or PC to
the switch is secure; change the cable if necessary.
If you cannot access Omega Local because of a faulty RS232
connection, use Omega Remote via Telnet or manage the
switch using SNMP until the problem is fixed.