Cisco Systems 3600 Memory Types, Memory Installation Documentation, Memory Specifications

Chapter 1 Overview of Cisco 3600 Series Routers

Memory

Memory

This section describes the various types of memory that may be present in a Cisco 3600 series router.

Memory Types

Cisco 3600 series routers support the following types of memory:

•DRAM or SDRAM—Stores the running configuration and routing tables, and is used for packet buffering by the router’s network interfaces. The Cisco IOS software executes from DRAM.

•Nonvolatile random-access memory (NVRAM)—Stores the system configuration file and the virtual configuration register. (For more information, see Appendix C, “Configuration Register.”)

•Flash memory—Stores the operating system software image. You can also add Flash memory on PCMCIA cards and compact Flash cards, depending on the router.

•EPROM-based memory—Stores the ROM monitor, which allows you to boot an operating system software image from Flash memory or PCMCIA memory.

Memory Installation Documentation

For information about installing DRAM, SDRAM, NVRAM, and Flash memory SIMMs, refer to the following hardware configuration note:

•Upgrading System Memory in Cisco 3600 Series Routers

For information about installing Flash memory PCMCIA cards, refer to the following hardware configuration note:

•Installing and Configuring Flash Memory Cards in Cisco 3600 Series Routers

For information about installing compact Flash memory cards, refer to the following hardware configuration note:

•Installing and Formatting Cisco 2691, Cisco 3631 and Cisco 3700 Compact Flash Memory Cards

Memory Specifications

Table 1-1through Table 1-4list processor and memory specifications for the routers.

Table 1-1 Cisco 3620 Router Processor and Memory Specifications

		Description	Specification
		Processor	80-MHz IDT1 R4700 RISC
		DRAM (main plus shared)	4 to 64 MB
		NVRAM	32 KB
		Flash memory (SIMM)	4 to 32 MB
		Flash memory (PCMCIA)	2 to 40 MB
		Boot ROM	512 KB
		1. IDT = Integrated Device Technology.
	Cisco 3600 Series Routers Hardware Installation Guide
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