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5-11
Cisco 3600 Series Hardware Installation Guide
OL-2056-02
Chapter 5 Installing Memory in the Router
Replacing DRAM and SDRAM
DRAM SIMM Orientation
SIMMs have a polarization notch to ensure proper orientation and alignment holes to ensure proper
positioning. Figure 5-7 shows the polarization notch and alignment holes on a SIMM. DRAM SIMMs
are installed with the connector edge down and the polarization notch near the front 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 SIMMs.
Figure 5-7 DRAM SIMM
16 MB 16 MB 8 MB-Dual 8 MB-Dual 48 MB
16 MB 16 MB 16 MB 16 MB 64 MB
32 MB-Dual
3
32 MB-Dual Not installed Not installed 64 MB
32 MB-Dual 32 MB-Dual 4 MB 4 MB 72 MB
32 MB-Dual 32 MB-Dual 8 MB 8 MB 80 MB
32 MB-Dual 32 MB-Dual 8 MB-Dual 8 MB-Dual 80 MB
32 MB-Dual 32 MB-Dual 16 MB 16 MB 96 MB
32 MB-Dual 32 MB-Dual 32 MB-Dual 32 MB-Dual 128 MB
1. 8 MB = single-bank SIMM, 8 MB in size.
2. 8 MB-Dual = dual-bank SIMM, 8 MB in size.
3. 32 MB-Dual = dual-bank SIMM, 32 MB in size.
Table 5-3 64-Bit DRAM Configuration for Cisco 3640 Routers (continued)
Bank 0
(SIMM 0)
Bank 1
(SIMM 1)
Bank 2
(SIMM 2)
Bank 3
(SIMM 3)
Total
Memory
Alignment holes
Connector edge
Polarization notch
H2407