![]() Other examples of pre-modern long-distance communication included audio messages, such as coded drumbeats, lung-blown horns, and loud whistles. ![]() Telecommunication is often used in its plural form. Such transmission paths are often divided into communication channels, which afford the advantages of multiplexing multiple concurrent communication sessions. The transmission media in telecommunication have evolved through numerous stages of technology, from beacons and other visual signals (such as smoke signals, semaphore telegraphs, signal flags, and optical heliographs), to electrical cable and electromagnetic radiation, including light. It has its origin in the desire of humans for communication over a distance greater than that feasible with the human voice, but with a similar scale of expediency thus, slow systems (such as postal mail) are excluded from the field. Telecommunication is the transmission of information by various types of technologies over wire, radio, optical, or other electromagnetic systems. ![]() ![]() Visualization from the Opte Project of the various routes through a portion of the Internet ![]()
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