Installation guide

24
Upgrading System Memory in Cisco 3600 Series Routers
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Replacing DRAM and SDRAM
DIMMs are manufactured with polarization notches to ensure proper orientation, and alignment holes to
ensure proper positioning. Figure 12 and Figure 13 show the polarization notches and alignment holes
on a DIMM. SDRAM DIMMs are installed with the connector edge down and the polarization notches
as follows:
• Cisco 3631: Toward the left side of the chassis
• Cisco 3660: Toward the rear of the chassis
Caution To avoid damaging ESD-sensitive components, observe all ESD precautions. To avoid damaging the
underlying mainboard, do not use excessive force when you remove or replace DIMMs.
Figure 12 SDRAM DIMM Orientation in the Cisco 3631 Router
Figure 13 SDRAM DIMM Orientation in the Cisco 3660 Router
Removing SDRAM DIMMs
Follow these steps to remove SDRAM DIMMs:
Polarization notches
Connector edge
68543
Alignment holes
Polarization notches
Connector edge
17338
Alignment holes