12 Cisco 3600 Series Memory Upgrade Configuration Note
Upgrading DRAM
DRAM Orientation
SIMMs are manufactured with a polarization notch to ensure proper orientation and alignment holes
to ensure proper positioning. Figure 6 shows the polarization notch and alignment holes on a SIMM
card. Cisco 3600 series DRAM SIMM cards are installed with the connector edge down, the
polarization notch near the front of the chassis, and the component side facing the right side of the
chassis.
Caution To avoid damaging ESD-sensitive components, observe all ESD precautions. To avoid
damaging the motherboard, avoid using excessive force when you remove or replace SIMMs.
Figure 6 Cisco 3600 Series DRAM SIMM
Removing DRAM SIMMs
Follow these steps to remove DRAM SIMMs:
Step 1 Find the DRAM SIMM sockets on the motherboard, as shown in Figure 4 or Figure 5.
Caution Handle SIMMs by the card edges only. SIMMs are ESD-sensitive components and can be
damaged by mishandling.
16 16 8 – 40
16 16 4 8 44
16 16 4 16 52
16 16 8 4 44
16 16 8 16 56
16 16 16 – 48
16 16 16 4 52
16 16 16 8 56
Table 3 Cisco 3640 32-Bit-Wide DRAM Configurations (Continued)
Bank 0
(SIMM 0)
(MB)
Bank 1
(SIMM 1)
(MB)
Bank 2
(SIMM 2)
(MB)
Bank 3
(SIMM 3)
(MB)
Total
Memory
(MB)
Alignment holes
Connector edge
Polarization notch
H2407
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