WIRELESS COMMUNICATION.pdf (Size: 64.54 KB / Downloads: 408)
Whether it’s because you have made a call using a mobile phone, received a message
on your pager, checked your email from a PDA, we have all come across a wireless
data or voice network!
If a user, application or company wishes to make data portable,
mobile and accessible then wireless networking is the answer. A wireless
networking system would rid of the downtime you would normally have in a wired
network due to cable problems. It would also save time and money due to the fact
that you would spare the expense of installing a lot of cables. Also, if a client
computer needs to relocate to another part of the office then all you need to do is
move the machine with the wireless network card.
Wireless networking can prove to be very
useful in public places – libraries, guest houses, hotels, cafeterias, and schools are all
places where one might find wireless access to the Internet. From a financial point of
view, this is beneficial to both the provider and the client. The provider would offer
the service for a charge – probably on a pay per use system, and the client would be
able to take advantage of this service in a convenient location; away from the office or
What is a network?
A network is a set of devices connected by media links. A node
can be a computer, printer, or any other device capable of sending and receiving data
generated by other nodes on the network. The links connecting the devices are often
called communication channels.
Types of networks
A) Token ring networks
B) Ethernet networks
C) Wireless networks
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What is a wireless network?
A network protocol that enables online content to be viewed via wireless devices
Such as cellphones, laptops and handhelds are called a wireless network.
Bluetooth is a simple type of wireless networking
that allows the formation of a small network with up to eight devices being connected
at once. Such devices would include PDAs, Laptops, Mobile Phones and Personal
Computers. However, Bluetooth may also be found in keyboards, mice, headsets and
mobile phone hands-free kits, amongst others. It was originally invented by Ericsson
in 1994. In 1998 the Bluetooth SIG (Special Interest Group) was formed by a small
number of major companies – Ericsson, Nokia, Intel and Toshiba – to help each other
develop and promote the technology. Bluetooth falls under personal area
networking since it is has a very short range – 30 to 300 feet. This sort of range adds
to the security of such a technology in that if someone wanted to sniff your
connection they would not only need special equipment but they would have to be
fairly close to you. The main features of Bluetooth are that unlike Infra Red, the
signal is not affected by walls it uses radio technology, it is not very expensive, and
has little power consumption.