Allied Telesis AT-SBx31CFC960 - Manual (Page 237)

SwitchBlade x3112 Chassis Switch and AT-SBx31CFC960 Card Installation Guide
237
supply interfaces (opto-couplers) on the rear panel of the chassis. For
troubleshooting suggestions, refer to “Power Supply Interfaces (Opto-
couplers)” on page 252.
Caution
The power supply interfaces are not hot swappable and should only
be serviced by an authorized service technician.