Cisco Systems OL-2056-02 manual Dram Simm Orientation

Chapter 5 Installing Memory in the Router

Replacing DRAM and SDRAM

Table 5-3 64-Bit DRAM Configuration for Cisco 3640 Routers (continued)

Bank 0	Bank 1	Bank 2	Bank 3	Total
(SIMM 0)	(SIMM 1)	(SIMM 2)	(SIMM 3)	Memory
16 MB	16 MB	8 MB-Dual	8 MB-Dual	48 MB
16 MB	16 MB	16 MB	16 MB	64 MB
32 MB-Dual3	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.

DRAM SIMM Orientation

SIMMs have a polarization notch to ensure proper orientation and alignment holes to ensure proper positioning. Figure 5-7shows 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

Alignment holes

H2407

Connector edge Polarization notch

Cisco 3600 Series Hardware Installation Guide

OL-2056-02 5-11