Allied Telesis SwitchBladex8112 Installation Manual page 231

Section II: Installing the Chassis
SwitchBlade x8112 Chassis Switch and AT-SBx81CFC960 Card Installation Guide
 The control card may not be able to detect the DC power supply
because it is not running the most recent version of the
management software. For instructions on how to verify the
software version on the control card, refer to "Using Local
Management to Verify the Chassis" on page 224 and "AlliedWare
Plus Software Releases for the Hardware Components" on
page 86.

The problem may be with one of the two power supply interfaces
(opto-couplers) on the rear panel of the chassis. For
troubleshooting suggestions, refer to "Power Supply Interfaces
(Opto-couplers)" on page 242.
Caution
The power supply interfaces are not hot swappable and should only
be serviced by an authorized service technician.
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