26APPENDIX A: AIRCONNECT OVERVIEW

■The ratio of good-transmitted packets to attempted-transmitted packets falls below a threshold.

■The wireless client detects an imbalance in the number of wireless clients associated with available APs and roams to a less loaded AP.

A wireless client selects the best available AP and adjusts itself to the AP direct-sequence channel to begin association. Once associated, the AP begins forwarding any frames it receives addressed to the wireless client. Each frame contains fields for the current direct-sequence channel. The wireless client uses these fields to resynchronize to the AP.

Mobile IP The Internet Protocol identifies the wireless client point of attachment to a network through its IP address. The AP routes packets according to the location information contained in the IP header. If the wireless client roams across routers to another subnet, the following situations occur:

■The wireless client changes its point of attachment without changing its IP address, causing forthcoming packets to become undeliverable.

■The wireless client changes its IP address when it moves to a new network, causing it to lose connection.

Mobile IP enables a wireless client to communicate with other hosts using only its home IP address after changing its point-of-attachment to the internet/intranet.

Mobile IP is like giving an individual a local post office forwarding address when leaving home for an extended period. When mail arrives for the individual home address, it is forwarded by the local post office to the current care-of-address.

Using this method, only the local post office requires notification of the individual current address. While this example represents the general concept of Mobile IP operation and functionality, it does not represent the implementation of Mobile IP used.

A tunnel is the path taken by the original packet encapsulated within the payload portion of a second packet to some destination on the network.

A Home Agent is an AP acting as a router on the wireless client home network. The home agent intercepts packets sent to the wireless client home address and tunnels the message to the wireless client at its current location. This happens as long as the wireless client keeps its home agent informed of its current location on some foreign link.

A Foreign Agent is an AP acting as a router at the wireless client location on a foreign link. The foreign agent serves as the default router for packets sent out by the wireless client connected on the same foreign link.

A care-of-address is the IP address used by the wireless client visiting a foreign link. This address changes each time the wireless client moves to another foreign link. It can also be viewed as an exit point of a tunnel between the wireless client home agent and the wireless client itself.

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3Com 09-1765-001 manual Appendix a Airconnect Overview
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09-1765-001 specifications

The 3Com 09-1765-001 is a versatile and robust networking device designed to enhance various aspects of enterprise network environments. Known for its reliability and performance, this product stands out in the competitive field of networking hardware, making it a preferred choice for businesses aiming to optimize their network infrastructure.

One of the main features of the 3Com 09-1765-001 is its support for advanced network management protocols. This device is equipped with SNMP (Simple Network Management Protocol), which facilitates efficient monitoring and management of network devices. With SNMP, network administrators can keep track of bandwidth usage, device health, and performance metrics, enabling proactive maintenance and troubleshooting.

Additionally, the 3Com 09-1765-001 boasts impressive speed and connectivity options. It features multiple Ethernet ports that support various speeds, typically ranging from 10/100 Mbps, and is designed to provide fast data transfer rates necessary for modern applications. This ensures seamless communication between devices within the network, catering to the increasing demand for speed in data handling, especially in enterprises with heavy usage.

Security is another critical characteristic of the 3Com 09-1765-001. It incorporates essential security features designed to protect sensitive data and ensure safe network access. These features include support for VLANs (Virtual Local Area Networks), access control lists, and port security measures that help to segment network traffic and restrict unauthorized access.

The device is also designed with flexibility in mind, allowing for easy integration into existing network infrastructures. It can function as a standalone device or be easily integrated with other 3Com products, creating a comprehensive networking solution tailored to specific business needs.

In terms of physical characteristics, the 3Com 09-1765-001 is typically housed in a durable chassis designed to endure the rigors of a busy server room or data center. Its compact design also allows for easy rack mounting, optimizing space usage while ensuring efficient operation.

Overall, the 3Com 09-1765-001 represents a combination of advanced features, reliable technology, and user-friendly design, making it an excellent choice for organizations looking to enhance their network capabilities. With its emphasis on speed, security, and manageability, this device is well-suited for the complexities of modern enterprise networking.
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