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# Installing Line and I/O Modules

This section describes the procedures for installing line and I/O modules.

| Note: Install the I/O 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.

## Installing a Line Module or an I/O Module

To install a module:

1. Ground yourself by using an antistatic wrist strap or other device and connect it to the ESD grounding jack on the chassis.
2. Choose the slot where you want to insert the module.

   | Note: Line modules are in the front of the system and I/O modules are in the back of the system.

   Table 5: Module Slot Assignments

   Router | Module Slot
   --- | ---
   ERX-1440 router | Install modules other than the OC48 modules in slots 0–5 and slots 8–13 Install the OC48 line module in slots 2–3 and slots 4–5 Install the corresponding I/O module only in the lower of the two slots (either slot 2 or slot 4) that the line module spans
   ERX-1410 router | Install modules in slots 0–5 and slots 8–13
   ERX-7xx models | Install modules in slots 2–6
   ERX-310 router | Install modules in slots 1–2

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 module 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 20.
6. Guide the module into the chassis by placing it between the guides of the selected slot and pushing the module until it stops.

   The module stops sliding when the ejectors make contact with the front of the chassis.

   | Caution: If you meet strong resistance when attempting to seat the module using the ejectors, remove it from the chassis and confirm that the slot is designed to hold the module. Then verify, if applicable, that the module matches its corresponding module (I/O module or line module). Also, be sure that you have aligned the top and bottom edges in the correct matching tracks.

7. Insert the module into the midplane by simultaneously depressing both ejectors (as shown in Figure 20) and exerting forward pressure on the module.
8. Tighten the module's captive screws using a No. 2 Phillips screwdriver. Alternately turn each screw several times before tightening them completely to allow the module to sit correctly.

   | Caution: Do not overtighten the screws.

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