Replacing an MCS on an M40e or M160 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 6. 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 on the M40e and M160 Routers.

Removing an MCS from an M40e or M160 Router

To remove an MCS from an M40e or M160 router, follow this procedure:

1. Place an electrostatic bag or antistatic mat on a flat, stable surface to receive the MCS.
2. Attach an ESD strap to your bare wrist and connect the strap to one of the ESD points on the chassis.
3. Remove the rear component cover by loosening the thumbscrews at the corners of the cover and pulling it straight off of 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 or M160 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. The command shuts down the Routing Engine cleanly, so its state information is preserved:
   user@host> request system halt

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

6. Flip the ends of the extractor clips outward, as shown in Figure 17.
7. Grasp the extractor clips and slide the unit 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 prepared in Step Step 1.

   Figure 17: Removing an MCS from an M40e or M160 Router

   

Installing an MCS in an M40e or M160 Router

To install an MCS in an M40e or M160 router, follow this procedure:

1. Attach an ESD 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 (see Figure 18).
4. Press the extractor clips on the left and right sides 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 Protocols, Class of Service, and System Basics Command Reference.

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

   Figure 18: Installing an MCS in an M40e or M160 Router