Telecommunication is communication at a distance by technological means that, significantly through electrical signals or magnetic force waves. Because of the numerous totally different technologies concerned, the word is commonly employed in a form, as telecommunications. Early telecommunication technologies enclosed visual signals, like beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs. Different samples of pre-modern telecommunications embody audio messages like coded drumbeats, lung-blown horns, and loud whistles. Electrical and magnetic force telecommunication technologies embody telegraph, telephone, and telex machine, networks, radio, microwave transmission, fibre optics, communications satellites and therefore the net. A revolution in wireless telecommunications began within the decennium with pioneering developments in radio communications by Tesla and Guglielmo Marconi. Marconi won the Nobel Prize in Physics in 1909 for his efforts. Different extremely notable pioneering inventors and developers within the field of electrical and electronic telecommunications embody Charles Sir Charles Wheatstone and discoverer (telegraph), Alexander Graham Bell (telephone), male monarch Armstrong, and Lee discoverer (radio), additionally as John Logie Baird and Philo Farnsworth (television). A communications network could be a assortment of transmitters, receivers, and communications channels that send messages to 1 another. Some digital communications networks contain one or additional routers that job along to transmit data to the proper user. AN analog communications network consists of 1 or additional switches that establish an affiliation between 2 or additional users. For each varieties of network, repeaters could also be necessary to amplify or recreate the signal once it is being transmitted over long distances. This is often to combat attenuation which will render the signal indistinguishable from the noise. Another advantage of digital systems over analog is that their output is simpler to store in memory.i.e. 2 voltage states (high and low) square measure easier to store than a continual vary of states.