- Cisco 1800 Series Integrated Services Router Manual

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Cisco 1800 Series Routers (Modular) Hardware Installation Guide
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Chapter 2 Overview of Cisco 1800 Series Routers (Modular)
Hardware Features
• Boot/NVRAM—Serves two functions. It stores the ROM monitor, which allows you to boot an
operating system software image from flash memory. It also stores the system configuration file and
the virtual configuration register.
Table 2-3 lists the memory specifications for Cisco 1800 series routers.
Note SDRAM and the flash memory are user-upgradable, but the boot/NVRAM is permanently soldered to
the router’s motherboard and is not upgradable.
LED Indicators
Table 2-5 summarizes the LED indicators for the Cisco 1841 router that are located in the router bezel
or chassis, but not in the interface cards.
For descriptions of the LEDs in the interface cards, see Cisco Interface Card Installation Guide.
Ta b l e 2-3 Router Memory Specifications for the Cisco 1841 Router
Description Specification
SDRAM 128 MB, expandable to 384 MB; default is 128 MB
Flash memory 32, 64, or 128 MB; default is 32MB
Boot/NVRAM 2/4 MB flash memory
Ta b l e 2-4 Router Memory Specifications for the Cisco 1861 ISR
Description Specification
DRAM 512 MB
Flash memory 128 MB
Ta b l e 2-5 Summary of Cisco 1800 Series LED Indicators
LED Color Description Location:
SYS PWR Green Router has successfully booted and the software is functional.
This LED blinks while booting or in the ROM monitor.
Front
SYS ACT Green Blinking when any packets are transmitted or received on any
WAN or LAN, or when monitoring system activity.
Front
CF Green On when flash memory is busy. Do not remove the CompactFlash
memory card when this light is on.
Back
FDX (FE 0/0) Green On indicates full-duplex operation. Off indicates half-duplex
operation.
Back
100 (FE 0/0) Green On indicates a 100-Mbps link. Off indicates a 10-Mbps link. Back
Link (FE 0/0) Green On when the router is correctly connected to a local Ethernet
LAN through Ethernet port 0.
Back
FDX (FE 0/1) Green On indicates full-duplex operation. Off indicates half-duplex
operation.
Back