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Cisco 12404 Internet Router Installation and Configuration Guide
OL-11636-01
AppendixA Technical Specifications
Product Architecture
SDRAM
SDRAM—The SDRAM on the PRP stores routing tables, protocols, and network
accounting applications; it also runs the Cisco IOS software. The default PRP
configuration includes 512 MB of error checking and correction (ECC) SDRAM.
DIMM upgrades of 512 MB and 1 GB are available. You cannot mix memory
sizes. If two DIMMS are installed, they must be the same memory size. Supported
memory configurations are listed in Table A -8.
Caution Cisco strongly recommends that you use only Cisco-approved memory. To
prevent memory problems, SDRAM DIMMs must be +3.3VDC,
PC133-compliant devices. Do not attempt to install other devices in the DIMM
sockets.
.
SRAM
The SRAM provides secondary CPU cache memory. The standard PRP
configuration is 2 MB. The principle function of SRAM is to act as a staging area
for routing table update information to and from the line cards. SRAM is not able
to be upgraded or configured.
TableA-8 Supported PRP Route Memory Configurations
Total RouteMemory Cisco Product Number DIMM Modules
512 MB1
1. One 512-MB DIMM is the default shipping configuration.
— 1 512-MB DIMM
1 GB MEM-PRP-512=2
2. Upgrades PRP to 1 GB by adding a second 512-MB DIMM.
2 512-MB DIMMs
1 GB MEM-PRP-1G= 1 1-GB DIMM
1.5 GB3
3. This memory size is not supported.
——
2 GB NA 2 1-GB DIMMs