Allied Telesis AT-8550SP - Manual (Page 80)

Chapter 3: Troubleshooting
80
Check the FAULT LED. During normal operations, the LED remains off,
except for periods when the management software is saving a change to
its configuration. If it remains on for an extended period, do the following:
ˆ Try resetting the switch by disconnecting and reconnecting the AC
power cord. If the switch is a DC model, reset the unit by powering off
and the powering on the DC circuit.
ˆ If the FAULT LED remains ON, try downloading a new version of the
switch’s management software through the RS-232 terminal port on
the front panel of the switch. For instructions, refer to the switch’s
software management guide.
ˆ If the LED remains on even after you have tried the above
suggestions, the switch may be having a hardware problem. Contact
your Allied Telesis representative for assistance.
Cannot Establish a Local Management Session
If you are unable to establish a local management session with the switch
through the RS-232 terminal port on the front panel, do the following:
ˆ Check to be sure that the RS-232 cable is securely connected to the
RS-232 terminal port on the switch and to the RS-232 port on the
terminal or personal computer.
ˆ Check to be sure that you are using a straight-through RS-232 cable.
Do not use a cross-over cable.
ˆ Check to be sure that the operating parameters on the terminal or the
terminal emulation program, if you are using a personal computer,
have been set correctly. The default settings for “Planning the
Installation” on page 52the RS-232 terminal port can be found in. See
“Planning the Installation” on page 52.