Replacing an MCS in an M40e Router

The router can have an MCS in each of the slots labeled MCS0 and MCS1 at the rear of the chassis, as shown in Figure 1. Each MCS weighs approximately 2.5 lb (1 kg).

The MCSs are hot-pluggable. For a description of the effect of removing an MCS, see Host Module Components in M40e Routers.

To remove an MCS from an M40e router:

1. Place an electrostatic bag or antistatic mat on a flat, stable surface.
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. Verify that the router is attached to a proper earth ground.
3. Remove the rear component cover by loosening the thumbscrew at each corner of the cover and pulling it straight off the chassis.
4. If two host modules are installed, check whether the MCS you are removing belongs to the master host module. If so, switch mastership to the standby host module. For instructions, see Switching Host Module Mastership on an M40e Router.
5. On the console or other management device connected to the Routing Engine that is paired with the MCS you are removing, enter CLI operational mode and issue the following command:

   user@host> request system halt

   The command shuts down the Routing Engine cleanly, so its state information is preserved.

   Wait to continue until a message appears on the console confirming that the operating system has halted.

6. Push the end of each extractor clip (located at each end of the MCS) outward.
7. Grasp the extractor clips and slide the MCS about halfway out of the chassis.
8. Place one hand under the MCS to support it, slide it completely out of the chassis, and place it on the antistatic mat or in the electrostatic bag.

Figure 5: Removing an MCS from an M40e Router

To install an MCS in an M40e router:

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis.
2. Place one hand under the MCS to support it and grasp one of the extractor clips on the faceplate with the other hand.
3. Align the rear of the MCS with the guides inside the chassis and slide it in completely.
4. Press the extractor clip at each end of the MCS inward.
5. Verify that the green LED labeled OK on the MCS faceplate is lit. Also check the host module LEDs on the craft interface to verify that the green LED labeled ONLINE is lit for the host module to which the MCS belongs.

   You can also issue the following CLI command to verify correct Routing Engine functioning:

   user@host> show chassis environment mcs

   For further information, see the JUNOS System Basics and Services Command Reference.

6. Reinstall the rear component cover and tighten the thumbscrews at the corners to secure it to the chassis.

   Figure 6: Installing an MCS in an M40e Router