Cisco 3631 Instalační příručka stáhnout pdf (Strana 20)

Upgrading System Memory in Cisco 3600 Series Routers

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Replacing DRAM and SDRAM

SIMMs are manufactured with a polarization notch to ensure proper orientation and alignment holes to

ensure proper positioning. Figure 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 7 DRAM SIMM

Removing DRAM SIMMs

Follow these steps to remove DRAM SIMMs:

Step 1 Attach an ESD-preventive wrist strap and ensure that it makes good contact with your skin. Connect the

equipment end of the wrist strap to the metal back plate of the chassis, avoiding contact with the

connectors.

Step 2 On the mainboard, locate the DRAM SIMM sockets. (See Figure 5 or Figure 6.)

Caution Handle the SIMM by the nonconnector edges only; do not press on the center. Handle carefully. SIMMs

are ESD-sensitive components and can be damaged by mishandling.

Step 3 Remove one SIMM at a time, beginning with the SIMM in bank 3. To lift the SIMM out of its socket,

pull the locking spring clips on both sides outward and tilt the SIMM toward the right side of the

chassis until it is free of the clips. (See Figure 8.)

Alignment holes

Connector edge

Polarization notch

H2407

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Cisco 3631 Instalační příručka Strana 20