• Do Not Power on until all installation have been completed.• If Expansion Chassis are installed, turn the power on/off in the order ofExpansion 2 Chassis, Expansion 1 Chassis and then Main Chassis.• For your safety, smooth the cut edges after removing the plastic knockout.1. Turn off the system power.2. Cut and remove the Plastic Knockouts as required for each Expansion interface board.CutCutPlasticKnockoutFigure 2-58 Plastic Knockouts3. Insert a Expansion Interface Board in the guide rail of chassis and push it securely into positionand tighten the two screws of the board.Expansion Interface BoardScrewsFigure 2-59 Mounting the Expansion Interface Board3.3.3 Mounting the 3COIDB/2BRIDB/1PRIDB BoardFor your safety, smooth the cut edges after removing the plastic knockout.1. Turn off the system power.ISSUE 1.0 SL2100Hardware Manual 2-43