Allied Telesis AT-SBx31CFC960 - Manual (Page 195)

SwitchBlade x3106 Chassis Switch and AT-SBx31CFC960 Card Installation Guide
195
Figure 141. Removing the Terminal Screws
6. With a #3 Phillips-head screwdriver, connect the positive (+) power
lead wire to the positive terminal on the power supply, with one of the
terminal screws removed in the previous step. The positive terminal is
on the left. Refer to Figure 142 on page 196.
Allied Telesis recommends tightening the screw to 30 to 40 inch-lbs.