Datasheet

Upgrading System Memory, Internal Flash Memory, and Boot ROM in Cisco 2600 Series Routers

OL-5474-01

Upgrading DRAM

Procedure for Cisco 261x, Cisco 262x, Cisco 265x, and Cisco 26xxXM

Most Cisco 2600 series routers contain two 100-pin dual in-line memory module (DIMM) sockets (or

banks) for DRAM. (See Figure 5.) Each socket can be filled with a 100-pin DRAM DIMM (EDO or

SDRAM DIMMs, depending on router model). You can use the memory-size iomem software command

to configure DRAM as a mixture of shared memory, which is used for data transmitted or received by

network modules and WAN interface cards, and primary or main memory, which is reserved for the CPU.

For further information about this command, refer to the Cisco IOS Release 12.3 configuration guides

and command references, located at the following URL:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/index.htm

Caution It is critical that the correct voltage DRAM modules be installed in Cisco 2600 series routers. Using

the incorrect memory causes the system to malfunction and may cause damage to the system board

or memory card. For memory voltage requirements, see Table 1.

To identify a 3.3-V 100-pin SDRAM DIMM, look for the part number label on the front of the card. (See

Figure 4.) Table 2 and Table 3 show the part numbers for the DIMMs.

Figure 4 Cisco 2600 Series 3.3- and 5-V 100-Pin DRAM DIMM

Table 2 3.3-V SDRAM Part Numbers

Memory Size 3.3-V SDRAM

32 MB 15-4108-xx

64 MB 15-4508-xx

128 MB 15-8693-xx

Table 3 5-V EDO DRAM Part Numbers

Memory Size 5-V EDO DRAM

8 MB 15-2854-xx

16 MB 15-2853-xx

32 MB 15-2851-xx

72185

15-4108-01

Part number