# Installing a Line Module or an IOA

This section describes the procedures for installing line modules and IOAs.

| Note: Install the IOA module before you install the corresponding line module; otherwise, the diagnostics fail and the line module's status is listed as inactive when you issue the show version command. If this occurs, remove and reinsert the line module. The router supports hot-swapping of line modules and IOAs. Hot-swapping enables you to add or remove a line module without powering down the system. IOAs that support hot-swapping enable you to add or remove an IOA without rebooting the line module. See Table 4 for a list of hot-swappable IOAs.

To install a line module or IOA:

1. Ground yourself by using an antistatic wrist strap or other device and connect it to one of the ESD grounding jacks.
2. Choose the slot where you want to insert the line module or IOA.

   | Note: Line modules are in the front of the system and IOAs are in the back of the system. See Table 4 for IOA slot locations and combinations.

3. With a No. 2 Phillips screwdriver, loosen the screws that secure the blank filler panel covering the empty chassis slot, if present, and remove the filler panel.
4. Remove the line module or IOA from its antistatic bag, being careful not to touch module components, pins, leads, or solder connections.
5. Verify that the ejectors are in the open position, as shown in Figure 19.
6. Guide the line module or IOA into the chassis by placing it between the guides of the selected slot and pushing the module until it stops.

   The module or IOA stops sliding when the ejectors make contact with the chassis.

   | Caution: If you meet strong resistance when attempting to seat the line module or IOA using the ejectors, remove it from the chassis and confirm that the slot is designed to hold the component. Also, be sure that you have aligned the top and bottom edges in the correct matching tracks.

7. Insert the line module or IOA into the midplane by simultaneously depressing both ejectors (as shown in Figure 19) and exerting forward pressure on the module.
8. Tighten the module's captive screws using a No. 2 Phillips screwdriver.

   | Note: Tighten the captive screws completely before installing an adjacent module so that proper EMI gasket compression occurs. Failure to do this can make it difficult to install adjacent modules.

   | Caution: Do not overtighten the screws.