30
AT-9800 Series Switch
C613-03059-00 REV F
5.
If the port is enabled, make sure the transmission speed matches that of the
connected device (auto-negotiating, full or half-duplex).
Important
If the port is disabled, someone has used the software to
manually disable it. You should find out why the port was disabled before
enabling it.
Power LED is off
This can indicate:
■
a loose power cord
■
a power supply failure
Perform the following steps in sequence:
1.
Check that the power cord connections are secure.
2.
Check that all switches and circuit protection devices are in the ON position.
3.
Ensure that the supply voltage is within the operational range: 100–240 VAC
and 50–60 Hz for AC models, or 40–60 VDC for DC models.
Fault LED is on
This can indicate:
■
there is a problem with the switch or PSU
■
the switch or management software is malfunctioning
■
a hardware fault is preventing switch startup
Perform the following steps in sequence:
1.
Check
“Switch LEDs” on page 7
for descriptions and explanations of LED
flashing sequences.
2.
Reset the switch by pressing the recessed RESET button on the front panel.
3.
If you were attempting to download software or manage the switch via the
RS-232 terminal port, check that connections between the terminal port and
local terminal or PC are secure.
If you cannot access the switch’s software because of a faulty RS-232
terminal port connection, you can still manage the switch via Telnet or
SNMP until the problem is fixed.
4.
Download the latest software release. See the
AT-9800 Series AlliedWare™
Operating System Software Reference
for more information on how to obtain
the latest software release.
