Cisco Systems 1900 Series Memory, External Modules In chassis slots Internal Modules, Dram, Udimm

Chapter 1 Overview of the Router

Hardware Features

Table 1-2 Summary of Cisco 1940 Series Removable and Interchangeable Modules

External Modules (In chassis slots)		Internal Modules
CompactFlash 1	Enhanced High-Speed WAN	Internal Service Module (ISM)3
	Interface Cards (EHWICs)2
2	2	1

1.Only Advanced Capability CompactFlash (CF) purchased from Cisco operate in Cisco 1900 series ISRs. Legacy CF will not operate in these routers. When legacy CF is inserted, the following error message appears:

WARNING: Unsupported compact flash detected. Use of this card during normal operation can impact and severely degrade performance of the system. Please use supported compact flash cards only.

2.HWICs, WICs, and VWICs (data only) are supported.

3.Non wireless models only.

Memory

Cisco 1900 series routers contain the following types of memory:

•DRAM—Stores the running configuration and routing tables and is used for packet buffering by the network interfaces. Cisco IOS software executes from DRAM memory.

•Boot/NVRAM—Internal flash memory. Stores the bootstrap program (ROM monitor), the configuration register, and the startup configuration.

•Flash memory—External flash memory (1940 series only). Stores the operating system software image.

Table 1-3summarizes the memory options for Cisco 1900 series routers. The default memory numbers for RAM represent the minimum usable memory. You can install additional RAM in multiples of the default amount, up to the maximum amount on the Cisco 1940 series ISRs. The Cisco 1905 and Cisco 1921 have factory installed, fixed memory modules and no expansion slots.

Table 1-3	Router Memory Specifications
DRAM	1940 Series	1905	1921
DRAM	Type—Unregistered DIMM	Type—DDR2	Type—DDR2
	(UDIMM)	DIMM expansion slots—0	DIMM expansion slots—0
	DIMM sizes—512 MB, 1 GB, 2	Default onboard	Default onboard
	GB
		memory—2561MB non ECC	memory—512 MB non ECC
	DIMM expansion slots—1	Maximum memory—512 MB2	Maximum memory—512 MB
	Default onboard memory—512	Boot or NVRAM—Internal 16 MB	Boot or NVRAM—Internal 16 MB
	MB non ECC
		flash memory.	flash memory.
	Maximum memory—2.5 GB
	Boot or NVRAM—Internal
	16-MB flash memory.

1.256 MB cannot support net boot or warm upgrade functions. Net boot and warm upgrade require 512 MB of memory.

2.512 MB activation requires memory licensing feature. See the Cisco IOS Software Activation Configuration Guide for details.

Cisco 1900 Series Hardware Installation

OL-19084-02 1-9