Cisco 12404 Installation And Configuration Manual page 261

Appendix A Technical Specifications
DRAM
Caution
OL-11636-01
The Cisco IOS software images that run the Cisco 12404 router reside in Flash
memory, which is located on the GRP 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 GRP. 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 GRP 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
The EDO DRAM on the GRP stores routing tables, protocols, and network
accounting applications; it also runs the Cisco IOS software. The default GRP
DRAM configuration is 64 megabytes of EDO DRAM, which you can increase up
to 256 MB through DRAM upgrades. The Cisco IOS software runs from within
GRP DRAM. Table A-5
To prevent memory problems, DRAM DIMMs must be 3.3-volt, 60-nanosecond
devices. Do not attempt to install other devices in the DIMM sockets.
Table A-5 DRAM Configurations
Total DRAM Product Numbers
1
64 MB MEM-GRP/LC-64(=)
128 MB MEM-GRP/LC-64(=)
128 MB MEM-GRP/LC-128(=)
256 MB MEM-GRP/LC-256(=)
1. 64 MB of DRAM is the default DRAM configuration for the GRP.
Cisco 12404 Internet Router Installation and Configuration Guide
Figure A-2.
lists the DRAM configurations and upgrades.
DRAM Sockets
U39 (bank 1)
U39 (bank 1) and
U42 (bank 2)
U39 (bank 1)
U39 (bank 1) and
U42 (bank 2)
Product Architecture
Number of DIMMs
One (1) 64-MB
DIMM
Two (2) 64-MB
DIMMs
One (1) 128-MB
DIMM
Two (2) 128-MB
DIMMs
A-9