Power; Led Indicators; Ventilation; Real-Time Clock And Battery - Cisco 3800 Series Quick Start Manual

LED Indicators

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
Indications" section on page 34
troubleshooting, see
For descriptions of LEDs on network modules or interface cards, see the
Hardware 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.
On the Cisco 3825 router, when the router is installed with a Inline Power (ILP) power supply, the
Note
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
Table 2
Specification
Dimensions (H x W x D)
Weight (minimum)
Overview of Cisco 3800 Series Routers
12
of
Table 1 in "Troubleshooting Cisco 3800 Series
and the
and Table 3 list Cisco 3800 series system specifications.
Cisco 3825 Router Specifications
"Powering Up Cisco 3800 Series
Cisco Interface Cards Installation
Value
3.5 x 17.1 x 14.7 in. (8.9 x 43.4 x 37.3 cm)
2 rack unit height
23 lb (10.5 kg)
"Verifying LED
Routers." To use LEDs for
Routers."
Cisco Network Modules
Guide.
OL-5966-01