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Appendix A Technical Specifications
Product Architecture
A-14
Cisco 12404 Internet Router Installation and Configuration Guide
OL-11636-01
The Cisco IOS software images that run the Cisco 12404 router reside in Flash
memory, which is located on the PRP in the form of a single in-line memory
module (SIMM), and on up to two (PCMCIA) cards (called Flash memory cards)
that insert in the two PCMCIA slots on the front of the PRP. Storing the Cisco IOS
images in Flash memory enables you to download and boot from upgraded Cisco
IOS images remotely or from software images resident in PRP Flash memory.
The Cisco 12404 router supports system software downloads for most Cisco IOS
software upgrades, which enables you to remotely download, store, and boot from
a new Cisco IOS image. See Figure A-3.
Table A-7 PRP Memory Components
Type Size Quantity Description
SDRAM
1
1. Default SDROM configuration is 512 MB. Bank 1 (U15) must be populated first. You can use one or both banks to configure
SDRAM combinations of 512 MB, 1 GB, or 2 GV. 1.5-GB configurations are not supported.
512MB, 1GB,
or 2 GB
1 or 2 512-MB or 1-GB DIMMs (based on SDRAM required)
for main Cisco IOS software functions.
SRAM
2
2. SRAM is not user configurable or field replaceable.
2 MB (fixed) Secondary CPU cache memory functions.
NVRAM
3
3. NVRAM is not user configurable or field replaceable.
2 MB (fixed) 1 Nonvolatile random-access memory (NVRAM) for the
system configuration file.
Flash Memory 64 MB SIMM
4
4. Flash memory SIMM is not user configurable or field replaceable.
1 Contains Cisco IOS software images and other
user-defined files on the PRP.
Flash Memory
(card)
20 MB
5
5. ATA Flash disks, and Type I and Type II linear Flash memory cards are supported.
Up to 2 Contains Cisco IOS software images and other
user-defined files on up to two PCMCIA-based Flash
memory cards.
Flash boot
ROM
512 KB 1 Flash EPROM for the ROM monitor program boot
image.