Cisco Systems NPE-225, NPE-175 manual Removing Sdram DIMMs

Chapter 9 Removing and Installing the NPE or NSE

Removing and Replacing the NPE or NSE

Caution When inserting SIMMs, use firm but not excessive pressure. If you damage a socket, you must return the network processing engine or network services engine to the factory for repair.

Step 6 Gently push the SIMM into the socket until the spring latches snap over the ends of the SIMM. If necessary, rock the SIMM gently back and forth to seat it properly.

Step 7 Repeat Step 2 through Step 6 for the remaining SIMMs.

Step 8 When all SIMMs are installed, check all alignment holes (two on each SIMM) and ensure that the spring latch is visible. If it is not, the SIMM is not seated properly. If any SIMM appears misaligned, carefully remove it and reseat it in the socket. Push the SIMM firmly back into the socket until the spring latches snap into place.

This completes the SIMM replacement procedure. Proceed to the “Installing the NPE or NSE” section on page 9-21.

Removing SDRAM DIMMs

The procedures in this section are required only if you have an NPE-175, NPE-225, NPE-300, or NSE-1 and need to upgrade or replace the SDRAM DIMMs. On the NPE-175, NPE-225, and NSE-1, the SDRAM DIMMs are located in socket U15. The two user-configurable SDRAM DIMMs on the NPE-300 are located in sockets U45 and U44.

Note The NPE-300 contains two banks of SDRAM. Both SDRAM banks are used for all packet memory requirements; however, bank 0 is used exclusively for packet memory and is set at a fixed configuration in the factory.

Bank 1 contains two user-configurable SDRAM slots, DIMM slot 2 and DIMM slot 3 (see Chapter 3, “NPE-300 and NPE-400 Overview,” the “Components” section on page 3-2). Both slots in bank 1 can be populated by DIMMs of different sizes; however, the size of the DIMM in slot 2 must be greater than or equal to the size of the DIMM in slot 3, and the size of the DIMM in slot 3 can be zero.

Note Use only SDRAM DIMMs supplied by Cisco.

Use the following procedure to remove the existing DIMMs:

Step 1 Turn off the system power and remove the network processing engine or network services engine from the system. (Follow the steps in the “Removing the NPE or NSE” section on page 9-9.)

Step 2 Place the network processing engine or network services engine on an antistatic mat or pad and ensure that you are wearing an antistatic device, such as a wrist strap.

Step 3 Locate the DIMM and position the network processing engine or network services engine so that you are facing the DIMM you want to remove.

Step 4 Open the DIMM socket latches on the DIMM to release the DIMM from the socket. (See Figure 9-9.) The DIMM is under tension in the socket; therefore, the DIMM might be released from the socket with some force.

Network Processing Engine and Network Services Engine Installation and Configuration

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