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Telecommunication is the term for communicating over important distances and groups the technologies that allow this, like radio waves satellites or optical fiber.
Smoke signals and letters were ways of communicating, but then came the telephone. Ever since, the fast-paced evolution has had communication methods changing; becoming more instantaneous and covering greater distances, to the point of communicating with orbital stations through satellites. We now have internet access nearly worldwide.
Modern ways of telecommunicating: The television
Modern Telecommunication groups several different devices and technologies. Television, through satellite communication, is one of the most known: it is used to broadcast media. However, the most-used methods are the telephone and the internet. The telephone network changed as well. From the GSM to the 3G networks, the amount and type of data transferred has increased. The internet is used to communicate in various ways: e-mail, VOIP or even television, are some examples.
How does telecommunication work?
This concept requires some basic components to work. A transmitter; it takes the source information and transforms it into a signal. There is also the receiver who will convert back the signal into information for the user. For the information to flow between the two, a distribution channel is needed.
The evolution: Analog to digital?
There are two types of signal used to channel the data in telecommunication. The analog signal changes as it adapts to the information it carries. One of the disadvantages of this method is that it also takes in undesirable environment noise. This can be clearly seen with radios, for example. The digital type of transmission encodes the information, like in the famous binary method, and sends it over the channel. It will be decoded for the user when received. Digital communication presents the advantage of not being subject to noises.
Lien source:
http://en.wikipedia.org/wiki/Telecommunication
http://www.wisegeek.com/what-is-telecommunications.htm
