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Removing and Inserting SDRAM Modules
The SDRAM installed on the Routing Engine provides storage for the routing and forwarding tables and for other Routing Engine processes. The design of the Routing Engine allows you to modify the SDRAM configuration by adding DIMM memory modules to or removing modules from the Routing Engine board. The Routing Engine contains from one to three 168-pin DIMMs.
To modify the SDRAM configuration, use the following procedures:
Removing a SDRAM Module
The SDRAM modules are located on the top of the Routing Engine. To remove a SDRAM module:
- Place an electrostatic bag or antistatic mat on a flat, stable surface.
- 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.
- Remove the Routing Engine as described in Removing an M7i Routing Engine.
- To release the SDRAM module, press the plastic ejectors on both sides of the module.
- Grasp the SDRAM module, being careful not to touch any electrical components on the module, and firmly pull it out of the slot on the Routing Engine.
- Place the SDRAM module on the antistatic mat or in the electrostatic bag.
- Push the plastic ejectors to close the empty SDRAM module slot.
Inserting a SDRAM Module
To insert a SDRAM module onto the Routing Engine (see Figure 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. Verify that the router is attached to a proper earth ground.
- Remove the SDRAM module from its electrostatic bag.
- To open the empty SDRAM slot, press the plastic ejectors on both sides.
- Grasp the SDRAM module by the edges, being careful not to touch any electrical components.
- Pressing firmly on both ends, push the module into the slot until the ejectors return completely to the closed position.
- Install the Routing Engine as described in Installing the Routing Engine in a M7i Router.
You can view the SDRAM configuration and verify it was installed correctly by issuing the show chassis routing-engine command, described in Maintaining the M7i Routing Engine.
Figure 1: Installing the SDRAM Module
