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Cisco 3700 Series Routers Hardware Installation Guide
OL-2180-08
Chapter 1 Overview of Cisco 3700 Series Routers
Memory
For information on installing DRAM, SDRAM, NVRAM, and CompactFlash memory, see:
• Upgrading System Memory in Cisco 3700 Series Routers
• Installing Field-Replaceable Units in Cisco 3745 Routers
For information on installing CompactFlash memory cards, see:
• Installing and Formatting Cisco 2691, Cisco 3631, and Cisco 3700 CompactFlash Memory Cards
Memory
Cisco 3700 series routers support the following types of memory:
• SDRAM—Stores the running configuration and routing tables and is used for packet buffering by
the network interfaces. Cisco IOS software executes from SDRAM memory.
• NVRAM—Stores the system configuration file and virtual configuration register. For more
information, see Appendix C, “Configuration Register.” CompactFlash memory—Stores the
operating system software image. You can increase CompactFlash memory by adding Cisco 3700
CompactFlash memory cards. See the Installing and Formatting Cisco 3631 and Cisco 3700
CompactFlash Memory Cards document.
• EPROM-based memory—Stores the ROM monitor, which allows you to boot an operating system
software image from internal or external CompactFlash memory.
Table 1-1 and Table 1-2 list processor and memory specifications for Cisco 3700 series routers.
Table 1-1 Cisco 3725 Router Processor and Memory Specifications
Description Specification
Processor 240-MHz PMC-Sierra RM7061A RISC processor
SDRAM 128–256 MB
NVRAM 56 KB
CompactFlash 32, 64, or 128 MB
Boot ROM 512 KB
Table 1-2 Cisco 3745 Router Processor and Memory Specifications
Description Specification
Processor 350-MHz PMC-Sierra RM7000A RISC processor
SDRAM 128–256 MB
NVRAM 152 KB
CompactFlash 32, 64, or 128 MB
Boot ROM 704 KB
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