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After reading this chapter, you should be able to Understand the components of a wireless network Discover general wireless network architectural elements Understand how information flows through a wireless network Wireless networks utilize components similar to wired networks; however, wireless networks must convert information signals into a form suitable for transmission through the air medium.
Even though wireless networks directly contribute only to a portion of the overall network infrastructure, attention to all network functions is necessary to counter impairments resulting from the wireless medium.
This chapter discusses concepts common to all types of wireless networks, with emphasis on components and information signals.
Wireless Network System Components A wireless network consists of several components that support communications using radio or light waves propagating through an air medium. Some of these elements overlap with those of wired networks, but special consideration is necessary for all of these components when deploying a wireless network.
Figure illustrates these primary components. One of the most common types of user is a person.
For example, a business traveler accessing the Internet from a public wireless Becoming a network and computer system at an airport is a user.
In some cases, however, the user might not be human. A robot, for example, might receive instructions over a wireless network from a central computer that controls a manu-facturing process. Because the wireless network exists to serve the user, the user is the component that receives the benefits of a wireless network.
As a result, users are an important part of the wireless network.
The user initiates and terminates use of a wireless network, making the term end-user appropriate. Typically, a user operates a computer device, which often performs a variety of application-specific functions in addition to offering an interface to the wireless network.
Users of wireless networks tend to be mobile, constantly moving throughout a facility, campus, or city. Mobility is one of the most prominent benefits of deploying a wireless network. For example, a person walking through a convention center while sending and receiving e-mail from a PDA is exercising mobility.
The PDA in this case must have continual or frequent connections to a wireless network infrastructure.
Some users might require only portability; whereby, they stay at a particular location while using the wireless network for a specific period of time. An example of this type of usage is someone operating a laptop wirelessly from a conference room.
The user will turn on the laptop after sitting down in the conference room and shut off the laptop before leaving. As a result, the wireless network doesn't need to support continual movement. Other users might actually be stationary, which means that they operate from one place for an indefinite period of time.
An example of this type of user is someone working from a wireless computer in an office. The biggest difference between a stationary and portable user is that the stationary user will not require any form of roaming functions.
Roaming functions are difficult to implement in some situations. Computer Devices Many types of computer devices, sometimes referred to as clients, operate on a wireless network.
Some computer devices might be specifically designed for users, whereas some computer devices are end systems. In generally, any computer device might communicate with any other computer device on the same wireless network. Figure illustrates an assortment of computer devices for wireless networks.
Figure Computer Devices for Wireless Networks Satisfy Different Applications To support mobile applications, computer devices are often small, making them practical for people to carry with them at all times.
These devices generally have small screens, limited keyboards, and small batteries. The devices are mobile, but they can support only certain applications.
With portable and stationary applications, however, the computer devices are much larger. These devices generally have larger displays and keyboards, making them more suitable to use when browsing the Internet and other applications requiring relatively high performance.While focusing on network security monitoring, Bro provides a comprehensive platform for more general network traffic analysis as well.
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When these computers are joined in a network, people can share files and peripherals such as modems, printers, tape backup drives, or CD-ROM drives. MyAdvantech is a personalized portal for Advantech customers. By becoming an Advantech member, you can receive latest product news, webinar invitations and special eStore offers.
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