WirelesS
Wireless telecommunications
is the transfer of information between two or more points that are not
physically connected. Distances can be short, such as a few metres for
television remote control, or as far as thousands or even millions of
kilometres for deep-space radio communications. It encompasses various types of
fixed, mobile, and portable two-way radios,
cellular telephones, personal digital
assistants (PDAs), and wireless networking. Other examples of wireless technology include GPS units, Garage door openers
or garage doors, wireless computer mice, keyboards and Headset (audio), headphones, radio receivers, satellite television,
broadcast television
and cordless telephones.
Wireless
networks
Wireless networking
(i.e. the various types of unlicensed 2.4 GHz WiFi devices) is used to
meet many needs. Perhaps the most common use is to connect laptop users who
travel from location to location. Another common use is for mobile networks
that connect via satellite. A wireless transmission method is a logical choice
to network a LAN segment that must frequently change locations. The following
situations justify the use of wireless technology:
- To span a distance beyond the capabilities of typical cabling,
- To provide a backup communications link in case of normal network failure,
- To link portable or temporary workstations,
- To overcome situations where normal cabling is difficult or financially impractical, or
- To remotely connect mobile users or networks.
http://en.wikipedia.org/wiki/Wireless
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