4-2Installing modulesIMPORTANT:Before installing a module in the chassis, make sure the connectors on the module are not broken orblocked.Unless otherwise stated, MPUs, service modules, and fabric modules are collectively referred to as"modules" in this document. The modules are hot swappable.For the modules available for the switch, see "FRUs and compatibility matrixes" in H3C S12500G-AFSwitch Series Hardware Information and Specifications.Installing MPUsCAUTION:• If you are not to install an MPU in an MPU slot, keep the filler panel in the slot.• When you install an MPU, avoid damaging the connectors on the MPU.• To prevent a filler panel from being drawn into the chassis when fan speed is high, use bothhands to grasp the filler panel by its two sides during filler panel installation and removal on anoperating switch.IMPORTANT:Captive screws are required to install an MPU or service module on the switch. As a best practice,fasten a captive screw to a torque of 5.5 kgf-cm (0.54 Nm).You can install one MPU, or two MPUs for redundancy on the switch. If you are to install one MPU,install it in either of the MPU slots.Installing an MPU for the S12516G-AF and S12508G-AFFor the S12516G-AF and S12508G-AF, the MPU ejector levers and the ejector lever pillow blocks onthe MPU slots are pink marked. The MPU installation procedure is the same for the S12516G-AFand S12508G-AF.To install an MPU for the S12516G-AF and S12508G-AF:1. As shown by callouts 1 and 2 in Figure4-2, remove the filler panel from the target MPU slot.Keep the removed filler panel secure for future use.2. As shown by callout 3 in Figure4-2, pull the ejector levers of the MPU outward.3. As shown by callout 4 in Figure4-2, orient the MPU with lettering on it upright. Hold the MPU bythe front panel with one hand and support the bottom with the other. Push the MPU steadily intothe slot along the guide rails.Keep the MPU parallel to the slot to avoid touching other components in the chassis.4. Push the MPU until the brakes on its ejector levers touch the slot edges tightly.5. As shown by callout 4 in Figure4-2, continue to push the MPU by its middle part on the frontpanel until you cannot move it.6. As shown by callout 5 in Figure4-2, push the ejector levers inward until they come in closecontact with the front panel.7. As shown by callout 6 in Figure4-2, fasten the captive screws on the MPU.