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Cisco 3600 Series Hardware Installation Guide
OL-2056-02
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 5-6 lists possible Flash memory SIMM configurations and the resulting total Flash memory.
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