Unbounded media
- No physical connection is required.
- Space or air is the transmission medium for electromagnetic waves.
- Source and destination can be static or mobile.
- Broad spectrum from low to high bandwidth is available.
- Can be quickly implemented.
Wireless is:-
·
Wireless
networking - which is often just known as Wi-Fi - is a way of getting broadband
internet without wires.
·
Wi-Fi
allows you to connect several computers at once, anywhere in the house - or if
you have a laptop, to even use your computer in the garden. You don’t need to
install extra phone lines or cables.
·
Wi-Fi
creates a network in your home or office – a little zone where computers can
get broadband internet. It uses radio waves, just like TV or mobile phones. You
may sometimes hear this zone referred to as a WLAN (Wireless Local Area Network).
·
A device
called a wireless transmitter receives information from the internet via your
broadband connection. The transmitter converts the information into a radio
signal and sends it.
·
You could
think of the transmitter as a mini radio station, broadcasting signals sent
from the internet. The ‘audience’ for these transmissions is the computer (or
computers, as more than one can connect at the same time) which receives the
radio signal via something called a wireless adapter.
·
The whole
process, meanwhile, works in reverse, with the computer sending information to
the wireless transmitter. It then converts them and sends them via your
broadband connection.
MOBILE PHONE
A mobile phone (also known as a cellular phone, cell
phone and a hand phone) is a device that can make and receive telephone
calls over a radio link whilst moving around a wide geographic area. It does so
by connecting to a cellular network provided by a mobile phone operator,
allowing access to the public telephone network. By contrast, a cordless
telephone is used only within the short range of a single, private base
station.
In addition to telephony, modern mobile phones also support a wide
variety of other services such as text messaging, MMS, email, Internet access,
short-range wireless communications (infrared, Bluetooth), business applications,
gaming and photography. Mobile phones that offer these and more general
computing capabilities are referred to as smartphones.
The first hand-held mobile phone was demonstrated by Dr Martin Cooper of
Motorola in 1973, using a handset weighing around 1 kg. In 1983, the DynaTAC
8000x was the first to be commercially available. In the twenty years from 1990
to 2011, worldwide mobile phone subscriptions grew from 12.4 million to over
5.6 billion, penetrating the developing economies and reaching the bottom of
the economic pyramid.
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