Cisco 4221 ISR User Manual

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Hardware Installation Guide for the Cisco 4000 Series Integrated Services Router
OL-32185-02
Chapter 1 Overview of Cisco 4000 Series ISRs
Hardware Features of Cisco 4000 Series ISRs
Fans, Ventilation, and Airflow
Chassis Ventilation
Router and chassis temperature is regulated with internal fans. An onboard temperature sensor controls
the fan speed. The fans are always on when the router is powered on. Under most conditions, the fans
operate at the slowest speed to conserve power and reduce fan noise. When necessary, the fans operate
at the higher speeds under conditions of higher ambient temperature. To replace Cisco 4451 ISR,
Cisco 4431 ISR, and Cisco ISR4351 fan trays, see the “Replace a Fan Tray” section on page 6-53.
Figure 1-26 shows Cisco 4451 ISR airflow, Figure 1-27 shows Cisco 4431 ISR airflow, Figure 1-28
shows Cisco 4321 ISR airflow, and Figure 1-29 shows Cisco 4221 ISR airflow.
Figure 1-26 Cisco 4451 ISR Airflow
Figure 1-27 Cisco 4431 ISR Airflow
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Cisco 4221 ISR Specifications

General

Form Factor	Rack-mountable
WAN Ports	2
LAN Ports	2
RAM	4 GB
Flash Memory	4 GB
Product Type	Router
Total Number of Ports	4
Number of Network (RJ-45) Ports	4
Number of Total Expansion Slots	3
Expansion Slot Type	NIM, ISC
Number of NIM Slots	2
Number of ISC Slots	1
Manageable	Yes
Power Supply	Internal
Redundant Power Supply	No
Authentication Method	RADIUS, TACACS+
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.3ab
Operating Temperature	32°F to 104°F (0°C to 40°C)
Height	1.75 in
Encryption Algorithm	AES, 3DES
Dimensions (W x D x H)	1.75 x 13.5 x 1.73 inches
Operating Humidity	5 to 95% (noncondensing)