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Chapter 9: Troubleshooting
212
Power Supply Interfaces (Opto-couplers)
The two power supply interfaces in the lower right corner of the rear panel
are used by the active master control card to obtain status information
from the power supplies. The interfaces are shown in Figure 32 on page
66.
Each power supply interface supports two power units. The top interface
supports the power supplies in slots A and C. The bottom interface
supports the supplies in slots B and D.
An interface is operating normally when its Power LED is solid green. The
LED of an interface is off if the two corresponding power supply slots are
empty or the power supplies are not powered on. For example, the LED
for the bottom interface will be off if power supply slots B and D are empty
or if the power supplies are off.
The network operations of the chassis are not affected If one or both of the
interfaces fail. However. the active master control card changes the PSU
LED to flashing amber to signal the loss of communications to the power
supplies.
Note
The power supply interfaces are not hot swappable and can only be
serviced by an authorized service technician.
If the Power LED on a power supply interface is off, do the following:
1. Check that there are power supplies in the corresponding slots in the
front panel and that the power supplies are powered on. (The Power
LED on an interface is off when the slots are empty or the power
supplies are not powered on.)
2. Inspect the LEDs on the power supplies to check for a fault condition,
If there is a fault condition, go to “AT-SBxPWRSYS1 and AT-
SBxPWRPOE1 AC Power Supplies” on page 198 for troubleshooting
suggestions. If the LEDs indicate the power supplies are operating
normally, go to step 3.
3. Check the PSU LED on the active master control card. If the LED is
solid green, the power supplies and interfaces are operating normally.
No corrective steps are required. If the PSU LED is solid amber but the
LEDs on the power supplies indicate normal operations, there may be
a problem with a power supply interface. Contact your Allied Telesis
sales representative for assistance.