Supported Cisco Radio Antennas (Wireless Models Only); Chassis Ventilation; Real-Time Clock - Cisco CISCO1841 - 1841 Integrated Services Router Hardware Installation Manual

Hardware Features
The wireless operations can be configured by using the Cisco Router and Security Device Manager
(SDM) web-based application, or by using the Cisco IOS command-line interface (CLI). See the
Cisco Router and Security Device Manager (SDM) Quick Start Guide or the
Wireless Configuration Guide

Supported Cisco Radio Antennas (Wireless Models Only)

Table 1-4
wireless routers.
Table 1-4 Cisco Antennas Supported on the Cisco 1800 Series Fixed-Configuration Wireless Routers
Cisco Part Number Antenna Type
AIR-ANTM2050D-R Omnidirectional
AIR-ANTM4050V-R Omnidirectional
AIR-ANTM5560P-R Patch

Chassis Ventilation

Cisco 1800 series fixed-configuration routers have an internal multispeed fan that provides chassis
cooling, controlled by an onboard temperature sensor. The internal fan operates at a continuously
variable speed to minimize fan noise while providing sufficient chassis cooling.

Real-Time Clock

An internal real-time clock with battery backup provides the system software with time of day on system
power up. This allows the system to verify the validity of the certification authority (CA) certificate and
to timestamp syslog messages. Cisco 1800 series fixed-configuration routers have a socketed lithium
battery. This battery lasts the life of the router under the operating environmental conditions specified
for the router; the battery is not field-replaceable.
If the lithium battery in a Cisco 1800 series fixed-configuration router fails, the router must be returned
Note
to Cisco for repair.
Cisco 1800 Series Integrated Services Routers (Fixed) Hardware Installation Guide
1-6
for more information.
lists the Cisco antennas that are supported on the Cisco 1800 series fixed-configuration
Maximum Gain
2.0 dBi gain for 2.4GHz
5.0 dBi for 5GHz
4.0 dBi gain for 2.4GHz
5.0 dBi for 5GHz
5.5 dBi gain for 2.4GHz
6.0 dBi for 5GHz
Cisco Access Router
Description
This is the default antenna. Swivel-mount dipole
antenna operating in the 2.4- to 2.5-GHz band.
This antenna is designed for use with Cisco
wireless products utilizing an RP-TNC connector.
For more information, see the
Swivel-Mount Dipole Antenna
Ceiling-mount antenna operating in the 2.4- to
2.5-GHz band. This antenna has a clip that allows
it to be mounted to a drop-ceiling cross member.
For more information, see the
Diversity Omnidirectional Ceiling-Mount
Antenna document.
Wall-mount antenna operating in the 2.4- to
2.5-GHz band. For more information, see the
Cisco Multiband Wall-Mount, Corner-Mount, or
Mast-Mount Antenna document.
Chapter 1 Overview
Cisco Multiband
document.
Cisco Multiband
OL-6425-03