Cisco C1861-SRST-B/K9 Hardware Installation Guide - Page 22
Supported Cisco Radio Antennas (Wireless Models Only), Chassis Ventilation, Real-Time Clock - f my life
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Hardware Features Chapter 1 Overview 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 Cisco Access Router Wireless Configuration Guide for more information. Supported Cisco Radio Antennas (Wireless Models Only) Table 1-4 lists the Cisco antennas that are supported on the Cisco 1800 series fixed-configuration 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 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 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 Cisco Multiband Swivel-Mount Dipole Antenna document. 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 Cisco Multiband 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. 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. Note If the lithium battery in a Cisco 1800 series fixed-configuration router fails, the router must be returned to Cisco for repair. Cisco 1800 Series Integrated Services Routers (Fixed) Hardware Installation Guide 1-6 OL-6425-03