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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

884828

888428

8816–32

16–––16

164––20

168––24

16 16 4 – 36

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

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 23 24

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