Cisco WS-C1912-A Hardware Installation Guide - Page 28

Hardware Features Chapter 1 Overview of the Router Table 1-4 Summary of Cisco 1900 Series LED Indicators (continued) LED EN (RJ-45 console port) Color Green Description The RJ-45 console port is active. EN (USB serial Green The USB console port is active. console port) 1. SSID = Service Set Identifier 2. eUSB = embedded USB Location Rear panel, next to the console port Rear panel, next to the USB console port Chassis Ventilation An internal fan provides chassis cooling. An onboard temperature sensor controls the fan speed. The fan is always on when power is applied to the router. Under most conditions, the fan operates at the slowest speed to conserve power and reduce fan noise. It operates at the higher speeds when necessary under conditions of higher ambient temperature. See the "Chassis Airflow Diagram" section on page 4-3. 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. The Cisco 1900 series router has a lithium battery. This battery lasts the life of the router under the operating environmental conditions specified for the router, and is not field-replaceable. Note If the lithium battery in a Cisco 1900 ISR should fail, the router must be returned to Cisco for repair. Although the battery is not intended to be field-replaceable, the following warning must be heeded: Warning Dispose of used batteries according to the manufacturer's instructions. Statement 1015 Chassis Security The chassis of the router is constructed with a KensingtonTM security slot on the back panel. It can be secured to a desktop or other surface by using KensingtonTM lockdown equipment. Wireless LAN Connectivity The embedded Wi-Fi CERTIFIED™, 802.11a/b/g/n-compliant wireless access point is preinstalled in the router as an optional feature. The Cisco 1900 series routers support both autonomous and unified features and network configurations. 1-12 Cisco 1900 Series Hardware Installation OL-19084-02