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telecommunication communication Communication is the

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									communication
Communication is the activity of conveying information. Communication has been derived from the
Latin word "communis", meaning to share. Communication requires a sender, a message, and an
intended recipient, although the receiver need not be present or aware of the sender's intent to
communicate at the time of communication; thus communication can occur across vast distances in
time and space.

Two types of communication related to our cource

1)Global communication

2)Telecommunication

Global communication
Communication of information all over the world.

Telecommiunication
Tele mean distance and communication mean transfer of information.

Its mean

Telecommunications is the transmission of signals over long distances.



History of telecommunication
The history of telecommunication began with the use of smoke signals and drums in Africa, the
Americas and parts of Asia. In the 1790s, the first fixed semaphore systems emerged in Europe; however
it was not until the 1830s that electrical telecommunication systems started to appear.



Early communication

Early telecommunications included smoke signals and drums. Talking drums were used by
natives in Africa, New Guinea and South America, and smoke signals in North America and
China. Contrary to what one might think, these systems were often used to do more than merely
announce the presence of a camp.[1][2]

In 1792, a French engineer, Claude Chappe built the first visual telegraphy (or semaphore)
system between Lille and Paris. This was followed by a line from Strasbourg to Paris. In 1794, a
Swedish engineer, Abraham Edelcrantz built a quite different system from Stockholm to
Drottningholm. As opposed to Chappe's system which involved pulleys rotating beams of wood,
Edelcrantz's system relied only upon shutters and was therefore faster.[3] However semaphore as
a communication system suffered from the need for skilled operators and expensive towers often
at intervals of only ten to thirty kilometres (six to nineteen miles). As a result, the last
commercial line was abandoned in 1880.[




Basic elements

A basic telecommunication system consists of three primary units that are always present in
some form:

      A transmitter that takes information and converts it to a signal.
      A transmission medium, also called the "physical channel" that carries the signal. An
       example of this is the "free space channel".
      A receiver that takes the signal from the channel and converts it back into usable
       information.

Analogue communication
A communication in which data is transferred in the form of waves.

Digital communication
A communication in which data is trasfered in the form of BITs(0 or 1).

								
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