Cisco 7000 Series Hardware Installation And Maintenance Manual page 26

Physical Description
3. Required for downloading software images larger than 4MB (compressed). The Enterprise and the Enterprise and APPN images of
Cisco IOS Release 11.0 and later will require a Flash memory card.
Figure 1-9
NVRAM
Software
EPROMS
Flash memory
EPROMS
J2, Flash memory
write-protection
jumper
System Software or Boot ROMs
Eight EPROM components contain the default and bootstrap system software. The downloadable
system software and microcode feature, which the Cisco 7000 series supports for most upgrades,
allows you to remotely download, store, and boot from a new image.
EPROMs for Software Release 9.17(7), and later, also contain the latest microcode version in
compressed form for each interface processor. At system startup, an internal system utility scans for
compatibility problems between the installed interface processor types and the bundled microcode
images, then decompresses the images into running, random-access memory (RAM). The bundled
microcode images then function the same as images loaded from the microcode EPROMs.
It is unlikely that you will ever need to replace the default system software EPROMs. If replacement
is necessary in the future, refer to the section "RP and RSP7000 Configurations" in the chapter
"Maintenance" and to the replacement instructions that accompany the upgrade kit.
DRAM
Dynamic random-access memory (DRAM) stores routing tables, protocols, and network accounting
applications. The DRAM resides on four single in-line memory modules (SIMMs). The standard RP
configuration is 16 MB of DRAM, and an RP with 64 MB is available as an option or an upgrade.
Effective with Software Releases 9.17(8) and 9.21(3), the following options are available:
•
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Route Processor (RP)
Configuration
register
The RP in new systems is available with 16 MB of DRAM, which is the default, or with 64 MB
of DRAM (RP-64MB-OPT).
Flash memory Auxiliary port
card slot
CPU
DRAM
(SIMMs)
Console port