Memory - Cisco WS-C1924-A - Catalyst 1900 24 Ports 10MB Switch Hardware Installation Manual

Chapter 1 Overview of the Router
Table 1-2
External Modules (In chassis slots)
CompactFlash
2
1. Only Advanced Capability CompactFlash (CF) purchased from Cisco operate in Cisco 1900 series
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:
•
•
•
Table 1-3
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
DRAM Type—Unregistered DIMM
(UDIMM)
DIMM sizes—512 MB, 1 GB, 2
GB
DIMM expansion slots—1
Default onboard memory—512
MB non ECC
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
OL-19084-02
Summary of Cisco 1940 Series Removable and Interchangeable Modules
1
Enhanced High-Speed WAN
Interface Cards (EHWICs)
2
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.
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.
summarizes the memory options for Cisco 1900 series routers. The default memory numbers
Internal Modules
Internal Service Module (ISM)
2
1
1905
Type—DDR2
DIMM expansion slots—0
Default onboard
1
memory—256 MB non ECC
Maximum memory—512 MB
Boot or NVRAM—Internal 16 MB
flash memory.
Cisco IOS Software Activation Configuration Guide
Hardware Features
3
1921
Type—DDR2
DIMM expansion slots—0
Default onboard
memory—512 MB non ECC
2
Maximum memory—512 MB
Boot or NVRAM—Internal 16 MB
flash memory.
for details.
Cisco 1900 Series Hardware Installation
1-9