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Cisco 2900 Series and 3900 Series Hardware Installation Guide
OL-18712-02
Chapter 1 Overview of the Routers
Hardware Features
Module and Router Power Consumption
Cisco 2900 series and Cisco 3900 series ISRs have energy efficiency features that reduce power
consumption. Some of the energy efficiency features are controlled by the hardware, whereas other
energy efficiency features are controlled by the software.
Hardware Features
•
High-efficiency AC power supplies.
Software Features
•
See the Configuring Power Efficiency Management module in the Cisco 3900 Series, 2900 Series,
and 1900 Series Integrated Services Routers Software Configuration Guide at Cisco.com. Learn
how to configure and manage power going to modules and peripherals.
Fans, Ventilation, and Airflow
The Cisco 2911 and Cisco 3900 series ISRs have optional fan filters that are easy to replace. The filters
may be used to meet Network Equipment Building Systems (NEBS) requirements, or to operate in dusty
environments. When a filter becomes dirty, discard it and replace it with a new one. See the
“Replacing
a Fan Tray or Air Filter” section on page 5-45.
Fan speeds are controlled by the fan speed controller circuitry. To minimize noise, the fans operate at
one of several predetermined speeds and are dependent on the input ambient air temperature.
•
Figure 1-19 shows Cisco 2901 airflow.
•
Figure 1-20 shows Cisco 2911 airflow.
•
Figure 1-21 shows Cisco 2921 and 2951 airflow.
•
Figure 1-22 shows the Cisco 3900 series standard (non NEBS) airflow configuration. For NEBS, the
airflow is reversed.
•
Figure 1-23 shows the Cisco 3900 series standard NEBS airflow configuration.
5. Uses Cisco Redundant Power System 2300 as 100% power boost. Internal power supply does not supply any boost. In this configuration there is no POE
redundancy.
Ta b l e 1-10 Cisco 2900 series and Cisco 3900 series POE Power Ratings
Router Model
Power Supply 2901 2911 2921 2951 3925 3925E 3945 3945E
Internal POE 130 W 200 W 280 W 370 W 520 W 520 W 520 W 520 W
Internal POE
Boost
— — — — 1040 W 1040 W 1040 W 1040 W
External POE
Boost
— 750 W 750 W 750 W — — — —
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