• Supported Platforms
• MX240 Routers

• Related Topics
• MX240 Modular Port Concentrator (MPC) Description
• Maintaining MX240 MPCs
• Installing an MX240 MPC
• Removing an MX240 MIC
• MX240 MPC Serial Number Label
• Preventing Electrostatic Discharge Damage to an MX240 Router

Removing an MX240 MPC

When you remove an MPC, the router continues to function, although the MIC interfaces installed on the MPC being removed no longer function.

An MPC installs horizontally in the front of the router. The MPCs are hot-insertable and hot-removable. A fully configured MPC can weigh up to 18.35 lb (8.3 kg). Be prepared to accept its full weight.

To remove an MPC (see Figure 1):

1. Have ready a replacement MPC or DPC blank panel and an antistatic mat for the MPC. Also have ready rubber safety caps for each MIC using an optical interface on the MPC that you are removing.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
3. Label the cables connected to each MIC on the MPC so that you can later reconnect the cables to the correct MICs.
4. Use one of the following methods to take the MPC offline:
   • Press and hold the corresponding online button on the craft interface. The green OK/FAIL LED next to the button begins to blink. Hold the button down until the LED goes off.
   • Issue the following CLI command:
     
     

     user@host>request chassis fpc slot slot-number offline

     For more information about the command, see the Junos System Basics and Services Command Reference.

5. Disconnect the cables from the MICs installed in the MPC.

   Warning: Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cable connected to a transceiver emit laser light that can damage your eyes.

   Caution: Do not leave a fiber-optic transceiver uncovered except when inserting or removing cable. The safety cap keeps the port clean and prevents accidental exposure to laser light.

   Caution: Avoid bending fiber-optic cable beyond its minimum bend radius. An arc smaller than a few inches in diameter can damage the cable and cause problems that are difficult to diagnose.

6. If a MIC uses fiber-optic cable, immediately cover each transceiver and the end of each cable with a rubber safety cap.
7. Simultaneously turn both the ejector handles counterclockwise to unseat the MPC.
8. Grasp the handles and slide the MPC straight out of the card cage halfway.
9. Place one hand around the front of the MPC (the MIC housing) and the other hand under it to support it. Slide the MPC completely out of the chassis, and place it on the antistatic mat or in the electrostatic bag.

   Caution: The weight of the MPC is concentrated in the back end. Be prepared to accept the full weight—up to 18.35 lb (8.3 kg)—as you slide the MPC out of the chassis. When the MPC is out of the chassis, do not hold it by the ejector handles, bus bars, or edge connectors. They cannot support its weight. Do not stack MPCs on top of one another after removal. Place each one individually in an electrostatic bag or on its own antistatic mat on a flat, stable surface.

10. If necessary, remove each installed MIC from the MPC.
11. After you remove each MIC, immediately place it on an antistatic mat or in an electrostatic bag.
12. If you are not reinstalling an MPC into the emptied line card slots within a short time, install a blank DPC panel over each slot to maintain proper airflow in the card cage.

    Caution: After removing an MPC from the chassis, wait at least 30 seconds before reinserting it or inserting an MPC into a different slot.