Cisco 2821 Series

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Cisco Systems, Inc., 170 West Tasman Drive, San Jose, CA 95134-1706 USA

Installing and Upgrading Fans in the Cisco 2821

and Cisco 2851 Series Routers

This document describes how to install or upgrade fans inside your Cisco 2821 and Cisco 2851 series

routers.

This document is intended for the fan installer who is familiar with electronic circuitry and wiring

practices and has experience as an electronic or electromechanical technician.

Note Use this document in conjunction with the following documents:

• Cisco 2800 Series Hardware Installation guide:

http://www.cisco.com/en/US/docs/routers/access/2800/hardware/installation/guide/hw.html

• Cisco 2800 Series and Cisco 3800 Series Integrated Services Routers Regulatory Compliance and

Safety Information document:

http://www.cisco.com/en/US/docs/routers/access/2800/hardware/rcsi/2838rcsi.html

If you have questions or need help, see the “Obtaining Documentation, Obtaining Support, and Security

Guidelines” section on page 20.

This document contains the following sections:

• Safety Warnings and Guidelines, page 2

• Items in the Fan Replacement Kit, page 10

• Required Tools and Equipment, page 10

• Location of the Cisco 2821 and Cisco 2851 Router Fans, page 11

• Upgrading the Cisco 2821 and Cisco 2851 Fan Unit, page 11

• Obtaining Documentation, Obtaining Support, and Security Guidelines, page 20.

Need help?

Do you have a question about the Cisco 2821 Series and is the answer not in the manual?

Cisco 2821 Series Specifications

General

Form Factor	Rack-mountable
Power Supply	AC 120/230 V (50/60 Hz)
Product Type	Router
Data Link Protocol	Ethernet, Fast Ethernet, Gigabit Ethernet
Operating System	Cisco IOS
Expansion Slots	4 x HWIC
Memory	256 MB (max 1 GB)
Network/Transport Protocol	L2TP, IPSec, PPPoE
Remote Management Protocol	SNMP, Telnet, HTTP, SSH
Encryption Algorithm	DES, 3DES, AES
Features	VPN support, Firewall protection, VLAN support, QoS
Flash Memory	64 MB (installed) / 128 MB (max)