US Robotics USR2410 Manual de usuario descargar pdf (Pagina 26)

commonly found in consumer hardware, easy to acquire, and operates on unregulated frequency

bands. Its large range of communication channels made it easy to use and expandable.

This project implements an infrastructure wireless mesh network. This was implemented so that

clients could connect to the network without requiring them to have special software or route

packets. Not requiring client to have special software improves overall accessibly to the network.

As well, the client’s system resources are not diminished and network stability will not be

degraded by clients entering and exiting the network.

The 802.11a standard was well suited for the mesh side of the network where as 802.11b\g was

suited for the client side. This combination of an infrastructures network for the mesh and having

the clients on separate frequency bands provided for optimal future expandability and prevented

any interference between the two interfaces.

3.2.1

Mesh Communication

The mesh communication system was the link between each router, implemented through the

802.11a standard. This communication standard had to meet many design specifications. It must

have the highest data rate available for consumer level wireless communication. This layer must

suffer minimal interference from other devices, as it is the backbone to the network. The 5GHz

operating frequency of 802.11a is best suited for this since it is protected from interference

common at the 2.4 GHz range. For example, the existing university network is an 802.11g

network and interference with this system had to be avoided.

The mesh communication system used an arbitrary channel of 30, chosen simply because it was

in the middle of the available channels. The D-link AG-530 card met all these design

requirements for wireless 802.11a communication. It was also know to be compatible with the

Linux operating system, since it used an Atheros chipset. The compatibility and driver will be

discussed in Chapter 4.

3.2.2

Client Communication

The client communication required a commonly used standard to allow ease of connections for

nearly all clients at a high data rate. This could be done wirelessly though the 802.11b or 802.11g

standards, since they are both commonly used for clients accessing a wireless network. Choosing

one of the above standards would also guarantee that clients would not interfere with the mesh

communication. In the network created, 802.11b was used for wireless communication between

clients and mesh routers. Although this protocol did not allow the same data rate as 802.11g, it

was well supported under the Linux operating system. A card was available for use and

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US Robotics USR2410 Manual de usuario Pagina 26