Cisco Systems 1900 Series Manual De Usuario

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 

.

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.

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:

Dispose of used batteries according to the manufacturer’s instructions. Statement 1015

The chassis of the router is constructed with a Kensington

TM

 security slot on the back panel. It can be 

secured to a desktop or other surface by using Kensington

TM

 lockdown equipment.

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.

EN (RJ-45 
console port)

Green

The RJ-45 console port is active.

Rear panel, 
next to the 
console 
port

EN (USB serial 
console port)

Green

The USB console port is active.

Rear panel, 
next to the 
USB 
console 
port

1.

SSID = Service Set Identifier

2.

eUSB = embedded USB