22APPENDIX A: AIRCONNECT OVERVIEW

The radio interface conforms to IEEE 802.11 HR specifications. The interface operates at 11 Mbps using direct-sequence radio technology. The AP supports multiple-cell operations with fast, transparent roaming between cells. With the direct-sequence system, each cell operates independently. Each cell provides a

11 Mbps bandwidth. Adding cells to the network provides increased coverage area and total system capacity. The AP supports wireless clients operating in Power Save Polling (PSP) mode or Continuously Aware Mode (CAM) without user intervention.

The DB-9,9-pin,RS-232 serial port provides a User Interface (UI) or a Point to Point

Protocol (PPP) connection. The UI provides basic management tools for the AP. The

PPPprovides a link between APs using a serial connection. The serial link supports short haul (direct serial) or long haul (telephone line) connections. The AP is a Data Terminal Equipment (DTE) device with male pin connectors for the RS-232 port.

Connecting the AP to a PC requires a null-modem cable; connecting the AP to a modem requires a straight-through cable.

Bridging Support The AP PPP interface, accessible from the serial port at the rear of the AP, provides two types of bridging operations: Internet Protocol (IP) bridging between an AP and a computer, and between two APs (with one AP connected to a LAN). To establish an Internet Protocol bridge with an AP, ensure that the computer includes the appropriate Telnet software with PPP and TCP/IP protocols. Using Telnet, a remote computer can connect to any AP on an Ethernet network, as long as data transfers through IP packets.

A PPP link provides the option of using a direct serial link or modem to extend wired Ethernet topologies. Once in PPP mode, the AP automatically attempts to communicate with the other device using the Data-Link Bridging (DLB) protocol. An AP using DLB communicates on the MAC level, and receives and transmits Ethernet frames.

If the other device does not support DLB, the AP attempts to communicate using

Internet Protocol Control Protocol (IPCP). An AP using IPCP communicates on the

IP level, and receives and transmits IP packets.

The PPP implementation in the AP uses the Link Control Protocol (LCP) and

Network Control Protocol (NCP) as described in:

■RFC 1171: the Point-to-Point Protocol, July 1990

■RFC 1220: PPP Extensions for Bridging, April 1991

■RFC 1332: The PPP Internet Protocol Control Protocol, May 1992

■RFC 1661: The Point-to-Point Protocol, July 1994

(RFCs are Requests For Comments used in Internet Communities.)

The AP database dynamically tracks wireless clients and APs on the PPP interface.

Packets forward to the PPP link after the AP determines their destination.

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3Com 09-1765-001 manual Network Control Protocol NCP as described
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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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