1-9
Cisco 1900 Series Hardware Installation
OL-19084-02
Chapter 1 Overview of the Router
Hardware Features
• The ISM connector inside the Cisco 1941W chassis accommodates an optional factory installed
wireless LAN card. The WLAN card is permanently installed in the ISM connector.
• Cisco 1940 series ISRs feature an optional upgrade to the internal power supply providing in-line
power (802.3af-compliant Power-over-Ethernet (PoE) and Cisco standard inline power) to optional
integrated switch modules. The Cisco 1905, and Cisco 1921 have an external feed for PoE.(See
Figure 1-2.)
• There are no user-installable or replaceable modules on the Cisco 1905 or Cisco 1921 routers. The
chassis cover should never be removed.
Caution Power off the PoE before installing an EHWIC in the Cisco 1905 and Cisco 1921 ISRs.
Table 1-2 summarizes the optional modules:
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.
Ta b l e 1-2 Summary of Cisco 1940 Series Removable and Interchangeable Modules
External Modules (In chassis slots) Internal Modules
CompactFlash
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.
Enhanced High-Speed WAN
Interface Cards (EHWICs)
2
2. HWICs, WICs, and VWICs (data only) are supported.
Internal Service Module (ISM)
3
3. Non wireless models only.
2 2 1
To Next Page
Loading...
Need help?
General
