Led indicators, Ventilation, Real-time clock and battery – Cisco 3800 Series User Manual

Page 26: Technical specifications

LED Indicators

Overview of Cisco 3800 Series Routers

OL-5966-01

LED Indicators

LEDs can help you monitor your router’s performance and operation by providing power, activity, and
status information. For an explanation of LED activity during power-up, see the

“Verifying LED

Indications” section on page 34

of “

Powering Up Cisco 3800 Series Routers

.” To use LEDs for

troubleshooting, see

Table 1

in “

Troubleshooting Cisco 3800 Series Routers

.”

For descriptions of LEDs on network modules or interface cards, see the

Cisco Network Modules

Hardware Installation Guide

and the

Cisco Interface Cards Installation Guide

Ventilation

Three internal multispeed fans cool the routers, controlled by a temperature sensor. At ambient
temperatures below 40 degrees C, they operate at low speed to conserve power and reduce noise. At
40 degrees C or above they operate at high speed. The power supply has its own integrated fan.

Note

On the Cisco 3825 router, when the router is installed with a Inline Power (ILP) power supply, the
internal multispeed fans will operate at high speed only. To verify the fan speed, use the show
environment command.

Real-Time Clock and Battery

An internal real-time clock (RTC) with battery backup allows the routers to check the validity of the
certification authority (CA) certificate. The RTC is accurate under the operating environmental
conditions specified for the router.

The clock and battery are permanently installed. Under the specified operating environmental
conditions, the battery lasts the life of the router and does not need to be replaced.

Technical Specifications

Table 2

and

Table 3

list Cisco 3800 series system specifications.

Table 2

Cisco 3825 Router Specifications

Specification

Value

Dimensions (H x W x D)

3.5 x 17.1 x 14.7 in. (8.9 x 43.4 x 37.3 cm)
2 rack unit height

Weight (minimum)

23 lb (10.5 kg)