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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. 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. 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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