LED Indicators, Ventilation | Cisco Systems OL-5965-01 instruction

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)

Overview of Cisco 3800 Series Routers

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OL-5965-01 specifications

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Cisco Systems OL-5965-01 warranty LED Indicators, Ventilation, Real-Time Clock and Battery

Models: OL-5965-01