Upgrading the Cisco 2821 and Cisco 2851 Fan Unit

Removing the Router Cover

To access the Cisco 2821 or Cisco 2851 fan unit, you must first remove the bezel and then remove the router cover. The bezel is the front plastic panel on the chassis, which has the Cisco logo, LEDs, ports, and input power connection.

To remove the bezel and router cover, complete the steps that follow. You will need a number 2 Phillips screwdriver.

If your router uses AC or DC power, observe the following warning:

Warning Do not touch the power supply when the power cord is connected. For systems with a power switch, line voltages are present within the power supply even when the power switch is off and the power cord is connected. For systems without a power switch, line voltages are present within the power supply when the power cord is connected. Statement 4

If your router uses DC power, observe the following warning:

Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit. Statement 1003

Step 1 Power down the router and disconnect the power cord from the front of the router.

Warning Before opening the unit, disconnect the telephone-network cables to avoid contact with telephone-network voltages. Statement 1041

Step 2 Disconnect all network interface cables from the back panel of the router.

Step 3 Place the router on a flat surface.

Step 4 Remove the bezel from the front of the router. Follow these steps.

Caution Before removing the bezel, make sure that the flash memory card ejector button is flush with the bezel. If the button projects from the bezel, removing the bezel can damage it.

Installing and Upgrading Fans in the Cisco 2821 and Cisco 2851 Series Routers

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Cisco Systems 2851 Series, 2821 Series manual Removing the Router Cover

2851 Series, 2821 Series specifications

Cisco Systems has long been a leader in networking technology, and the 2821 and 2851 Series routers exemplify the company’s commitment to delivering robust, versatile, and scalable networking solutions. Designed for small to medium-sized businesses and enterprise branch offices, these series are ideal for organizations looking to enhance their network functionality while maintaining cost-effectiveness.

The Cisco 2821 Series is designed for flexibility and performance. It supports a variety of advanced security features, including IPsec VPN, firewall capabilities, and intrusion prevention. Its modular design allows for the addition of various interface cards, which makes it highly customizable based on the specific needs of the organization. The 2821 router can handle up to 24,000 sessions, making it suitable for multiple simultaneous connections without compromising performance.

Another significant characteristic of the 2821 Series is its support for voice over IP (VoIP) technologies. It can integrate voice and data on the same network, reducing costs and simplifying management. Furthermore, it supports Cisco's Unified Communications, allowing organizations to introduce advanced telephony features seamlessly.

Upgrading to the Cisco 2851 Series provides even greater performance and capabilities. The 2851 offers increased throughput and improved scalability, supporting a more extensive range of applications. It also includes enhanced support for integrated security features, enabling organizations to further protect their data and network assets.

Both series utilize Cisco's IOS Software, which enables a variety of services, from quality of service (QoS) to network management tools. These routers are designed to handle multiple applications simultaneously, making them ideal for today’s network environments that demand high availability and performance.

The 2821 and 2851 Series routers also feature redundant power supplies and fan modules, ensuring maximum uptime and reliability. Their robust build quality and durability make them suitable for various environments, from office spaces to industrial settings.

In summary, Cisco's 2821 and 2851 Series are built to provide robust networking solutions for businesses of all sizes. With features focused on modularity, security, and integrated voice capabilities, these routers are adept at meeting the diverse needs of contemporary organizations while setting the foundation for future growth and scalability.