Allied Telesis AT-SBx81CFC960 - Manual (Page 195)

SwitchBlade x8112 Chassis Switch and AT-SBx81CFC960 Card Installation Guide
Section II: Installing the Chassis 195
Figure 137. 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 138 on page 196.
Allied Telesis recommends tightening the screw to 30 to 40 inch-lbs.