Installation guide

6
Upgrading System Memory in Cisco 2600 Series Routers
78-5125-04 B0
Upgrading DRAM
Memory Capacities
Cisco 2600 series routers use two types of dynamic memory:
• 5V EDO DRAM DIMMs (Cisco 2610, Cisco 2611, Cisco 2612, Cisco 2613, Cisco 2620, and
Cisco 2621 routers)
• 3.3V SDRAM DIMMs (Cisco 26xxXM, Cisco 2650, Cisco 2651, and Cisco 2691 routers)
Caution EDO DRAM and SDRAM DIMMs are not interchangeable. Although it is mechanically possible to
install an incorrect DRAM DIMM into a router, the router will not boot.
DRAM memory capacities are shown in Table 1:
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 configuration guides and command
references, located at:
Cisco Product Documentation > Cisco IOS Software > Cisco IOS Software Release you are using >
Configuration Guides and Command References
Table 1 Cisco 2600 Series DRAM Memory Table
Router DRAM Capacity DRAM Type
Cisco 2610 32- to 64-MB EDO DRAM 5V
100-pin DIMM
Cisco 2611
Cisco 2612
Cisco 2613
Cisco 2620
Cisco 2621
Cisco 2650 32-to 128-MB SDRAM 3.3V
100-pin DIMM
Cisco 2651
Cisco 2610XM
Cisco 2611XM
Cisco 2620XM
Cisco 2621XM
Cisco 2650XM
Cisco 2651XM
Cisco 2691 64- to 256-MB SDRAM 3.3V
168-pin DIMM