Installing a DRAM Module

The J4350 and J6350 Services Routers support 256-MB and 512-MB DRAM modules. Use only DRAM modules purchased from Juniper Networks specifically for your model.

Note: If you are installing a second DRAM module, install it in a socket in one of the opposite pair of sockets from the first DRAM module. This configuration might provide better performance than installing two DRAM modules in adjacent sockets.

To install a DRAM module onto the Routing Engine:

1. Take the following steps if you have not already done so:
   1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to the ESD point on the chassis, or to an outside ESD point if the router is disconnected from earth ground. For more information about ESD, see the Getting Started Guide for your router.
   2. Press and release the power button to power off the router. Wait for the POWER LED to turn off.
   3. Unplug the power cord or cable from the power source receptacle.
   4. Remove the screws from the sides and top of the chassis that secure the cover to the chassis.
   5. Slide the cover off the chassis.
2. Remove the DRAM module from its electrostatic bag.
3. To open the empty DRAM socket, press the plastic ejectors on both sides (see Figure 53).
4. Grasp the DRAM module by the edges, being careful not to touch any electrical components.
5. Pressing firmly on both ends, push the module into the socket until the ejectors click into the closed position (see Figure 53).
6. Slide the cover onto the chassis.
7. Replace and tighten the screws on the sides and top of the chassis that secure the cover to the chassis.
8. Replace the power cord or cable.
9. Press and release the power button to power on the router. Verify that the POWER LED lights steadily after you press the power button.
10. To view the DRAM configuration and verify that it was installed correctly, issue the show chassis routing-engine command, described in the JUNOS System Basics and Services Command Reference. This command shows the total memory installed.