Cisco Systems OL-2056-02 manual Replacing Flash Memory SIMMs, Installing Sdram DIMMs

Chapter 5 Installing Memory in the Router

Replacing Flash Memory SIMMs

Installing SDRAM DIMMs

Perform this procedure to install SDRAM DIMMs:

Step 1 Attach an ESD-preventive wrist strap and ensure that it makes good contact with your skin. Connect the equipment end of the wrist strap to the metal back plate of the chassis, avoiding contact with the connectors.

Step 2 On the mainboard, locate the SDRAM DIMM sockets shown in Figure 5-11.

Caution Handle DIMMs by the non-connector edges only. DIMMs are ESD-sensitive components and can be damaged by mishandling.

Step 3 Hold the DIMM with the polarization notch on the right, near the rear of the chassis, and with the connector edge at the bottom.

Step 4 Beginning with socket 0, insert the DIMM perpendicular to the socket. Push firmly into place (see Figure 5-13), using the minimum amount of force required. When the DIMM is properly seated, the socket guide posts fit through the alignment holes, and the locking spring clips click into place.

Step 5 Ensure that each DIMM is straight (perpendicular to the socket). (See Figure 5-13.)

Caution It is normal to feel some resistance when installing a DIMM, but do not use excessive force on the DIMM, and do not touch the surface components.

Step 6 Repeat Step 3 through Step 5 for each DIMM.

When you finish replacing DIMMs, and have installed all internal components, proceed to the “Replacing the Cisco 3660 Mainboard Tray” section on page 5-33 .

Replacing Flash Memory SIMMs

This section describes how to upgrade the Flash memory SIMMs. The system code (Cisco IOS software) is stored in the Flash memory SIMMs. You might need to replace or add Flash memory SIMMs to upgrade to a new Cisco IOS software feature set.

The router contains one or two 80-pin Flash memory SIMMs. You can upgrade Flash memory by replacing the existing 4-MB SIMM with an 8- or 16-MB SIMM, or by adding a SIMM to the second Flash memory socket. You can install from 4 to 32 MB of Flash memory. The size of the SIMMs in the two Flash memory sockets need not be the same.

Note Flash memory SIMMs are not interchangeable with DRAM SIMMs (used in Cisco 3620 and Cisco 3640 routers) or SDRAM DIMMs (used in Cisco 3631 and Cisco 3660 routers).

Each Flash memory SIMM socket corresponds to one bank of memory. Fill banks starting with 0, and empty banks starting with 1. Bank 0 must always be filled first and emptied last.

Table 5-6lists possible Flash memory SIMM configurations and the resulting total Flash memory.

Cisco 3600 Series Hardware Installation Guide

OL-2056-02 5-19