At-8412 And At-8414 Line Cards; Troubleshooting The Power Supplies - Allied Telesis AT-8400 Series Reference Manual

AT-8412 and
AT-8414 Line
Cards

Troubleshooting the Power Supplies

The AT-8412 and AT-8414 line cards contain a D/C LED. Under normal
operating conditions, the D/C LED is off when the port is operating in
half-duplex mode. If this LED is off and there is a communication
problem between the end nodes, it may be that the two sides are
working in half-duplex mode and data collisions are not occurring.
Check that the end nodes are operating in the same duplex mode.
This section covers troubleshooting information for both the AT-PWR10
and AT-PWR11 Power Supplies.
If you have lost power to the AT-PWR10 or AT-PWR11 Power Supplies,
check the LEDs on the power supplies and then use the following
guidelines for both AC or DC chassis.
If both the POWER and FAULT LEDs are off, do the following:
❑ Check that the power supply is firmly seated in its slot in the
chassis.
❑ Check that the two screws on the power supply are securely
fastened. If they are loose, use a Phillips screwdriver to tighten
them.
❑ If you cannot insert a power supply completely into the chassis,
check that you are inserting the appropriate power supply for
your type of chassis. The AC chassis are keyed to only accept the
AT-PWR10 power supply while the DC chassis are keyed to only
accept the AT-PWR11 power supply. Only the power supply that
matches the power requirements of the chassis will seat fully into
the power supply slot.
❑ Check that the management card is fully seated in the chassis. The
management card affects the LEDs on the power supplies. The
management card needs to be fully seated before the POWER LED
on the power supply can turn steady green.
AT-8400 Chassis Installation Guide
93