58 CHAPTER 7: SWITCH FABRIC M ANAGEMENT MODULES AND I NTERFACE M ODULESESD Safety InformationElectrostatic discharge (ESD) can damage components of the module. ESD, whichoccurs when the module is improperly handled, can cause complete orintermittent failures.CAUTION: To prevent ESD-related damage: Always wear an ESD wrist strap (not provided) when you handle a module,ensuring that the strap makes good skin contact and is properly grounded. Keep the module in its antistatic bag until you are ready to install it.Handling Precautions When you handle the module, follow these precautions: Always handle the module by the front panel only. Do not touch the components, pins, leads, or solder connections. Before you push the module into the chassis, make sure that the moduleejector handles are open. Do not twist or otherwise force the module into the chassis when you insert it.Use the upper and lower module guides to slowly and carefully slide themodule into the chassis. Keep the module in its antistatic bag until you are ready to install it.Installation Prerequisites Before you install a module, make the following preparations: Verify that the chassis is properly installed in a rack, on a table, or on a shelf,according to the instructions in Chapter 4. Have a flat-blade torque screwdriver available to secure the module to thechassis after you install it. Read the Switch 4005 Release Notes for potential important information aboutinstalling and upgrading modules in an existing chassis or a new chassis.Release notes are not included with the product packaging. You mustdownload a copy of the release notes from the 3Com Web site. Begin byclicking the “Downloads” link on this page:http://support.3com.com/index.htmSlot Restrictions Install a Switch Fabric Management Module (SFMM) in a slot that is labeled M1or M2. Install Fast Ethernet or Gigabit Ethernet Interface Modules in slots that arelabeled 1 through 12. For proper airflow and cooling in the chassis, ensure that blank faceplates coverany empty module slots.