Datasheet

10
Upgrading System Memory, Internal Flash Memory, and Boot ROM in Cisco 2600 Series Routers
OL-5474-01
Upgrading DRAM
SDRAM DIMM Orientation
DIMMs are manufactured with polarization notches to ensure proper orientation, and alignment holes to
ensure proper positioning. Figure 8 shows the polarization notches and alignment holes on a DIMM.
Caution To avoid damaging ESD-sensitive components, observe all ESD precautions. To avoid damaging the
system board, do not use excessive force when you remove or replace DIMMs.
Figure 8 168-Pin SDRAM DIMM
Removing SDRAM DIMMS
To remove SDRAM DIMMs:
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.
Step 2 On the system board, locate the SDRAM DIMM sockets shown in Figure 7.
Caution Handle DIMMs by the edges only. DIMMs are ESD-sensitive components and can be damaged by
mishandling.
Table 4 SDRAM Configurations for Cisco 2691 Routers
DIMM 0 DIMM 1 Total
64 MB DIMM — 64 MB
128 MB DIMM — 128 MB
64 MB DIMM 64 MB DIMM 128 MB
— 128 MB DIMM 128 MB
64 MB DIMM 128 MB DIMM 192 MB
128 MB DIMM 64 MB DIMM 192 MB
128 MB DIMM 128 MB DIMM 256 MB
Polarization notches
Connector edge
17338
Alignment holes