Chassis Ventilation; Real-Time Clock; Figure - Cisco 1841 - 3G Bundle Router Hardware Installation Manual

Chapter 2 Overview of Cisco 1800 Series Routers (Modular)
Table 2-5
LED
100 (FE 0/1)
Link (FE 0/1)
AIM

Figure 2-5

Figure 2-5
1
2
3
4

Chassis Ventilation

An internal three-speed 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.

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 a certification authority (CA) certificate. The
backup battery is a socketed lithium battery. This battery lasts the life of the router under the operating
environmental conditions specified for the router, and is not field replaceable.
OL-5876-03
Summary of Cisco 1800 Series LED Indicators (continued)
Color Description
Green On indicates a 100-Mbps link. Off indicates a 10-Mbps link.
Green On when the router is correctly connected to a local Ethernet
LAN through Ethernet port 1.
Green On indicates presence of an AIM in the internal AIM slot.
summarizes the LED indicators for the Cisco 1861 ISR that are located in the router bezel.
LEDs on the Front Panel of the Cisco 1861 Integrated Services Router
S Y S
P O E
V M
W L A N
4
3
2
1
SYS
POE
VM
WLAN
1
Solid green
Solid green
Solid green
Blinking green
Cisco 1800 Series Routers (Modular) Hardware Installation Guide
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