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Wireless Networks

Notes many wireless technologies which are helpful in developing wireless personal area network.
Personal area networks (PAN) are developed either using cables or wireless technologies.
Wireless PAN (Personal Area Network) is connected to the wired PAN (Personal Area Network)
system either using firewire or USB.
PANs (Personal Area Network)s are dependent on the Bluetooth or infrared technologies for the
transmission of wireless signals. Blue tooth wireless PAN (Personal Area Network) is referred
to as piconets. Piconets are ad hoc networks. In this piconets network number of devices are
connected by using Bluetooth technology. One key master device is further attached to seven
or more than dynamic slave seven devices. Master device has a control and option to activate
these devices at any time. Piconets work over a range of 200metres and transmit data of about
2100 kbit/ sec. the main focus point of wireless PAN (Personal Area Network) is to facilitate
individual workspace. The Bluetooth technology used in wireless PAN (Personal Area Network)
connection is based on IEEE 802.15 standard.

Wireless Personal Area Network (WPAN) can perform really efficient operations if we connect
them with specialized devices. For examples it can help surgeons to seek guidance from other
surgeons or team members during a surgical operation. Wireless Personal Area Network
(WPAN) is based on plug –in technology. When wireless equipments come into contact with
each other within the range of few kilometers, give an illusion if they are connected with a cable.
Rapid development and improvement in this technology is needed in this area. This further
development would help develop a seamless network between office and home devices. This
development would help scientists, archeologists and people associated to other departments to
transfer their findings to any database around them.

The wearable and portable computer devices communicate with each other. These devices while
communicating transfer digital signals and information, these signals are transferred using the
electrical conductivity coming out of human body. This linkup information exchange can take
place even between two people who are carrying digital assistance devices while they are shaking
hands. In this process of hand shake, an electric field is generated around people, and they emit
Pico amps. These emissions complete the circuit and hence an exchange of information takes
place. This information exchange includes the transfer of personal data such as email address,
phone numbers etc.

Did u know? The purpose of PDAs is to make the use of electric field around human beings.
Mobile phones (smart phones only), palmtops and even pagers serve this purpose. Wireless
digital devices work twenty four hours a day and seven days a week. This enables you to
stay in communication circle always. PAN (Personal Area Network) network has enabled
the transfer of data within the small geographical areas with the help of many small and
portable carrying devices.

7.5.1 Benefits of Wireless LAN

The advantages of WLAN are listed below:

z z People can access the network from where they want; they are no longer limited by the
length of the cable
z z Some cities have started to offer Wireless LANs. This means that people can access the
internet even outside their normal work environment, for example when they ride the
train home.
z z Setting up a wireless LAN can be done with one box (called Access point). This box can
handle a varying number of connections at the same time. Wired networks require cables
to be laid. This can be difficult for certain places.

z z Access points can serve a varying number of computers.

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