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Wireless telegraphy or radiotelegraphy is the transmission of text messages by radio waves, analogous to electrical telegraphy using cables. [1] [2] Before about 1910, the term wireless telegraphy was also used for other experimental technologies for transmitting telegraph signals without wires.
The disabled trains were able to maintain communications via their Edison induction wireless telegraph systems, [75] perhaps the first successful use of wireless telegraphy to send distress calls. Edison would also help to patent a ship-to-shore communication system based on electrostatic induction.
Unique to telecom engineering is the use of air-core cable which requires an extensive network of air handling equipment such as compressors, manifolds, regulators and hundreds of miles of air pipe per system that connects to pressurized splice cases all designed to pressurize this special form of copper cable to keep moisture out and provide a ...
1830s: Beginning of attempts to develop "wireless telegraphy", systems using some form of ground, water, air or other media for conduction to eliminate the need for conducting wires. 1858: First trans-Atlantic telegraph cable; 1876: Telephone. See: Invention of the telephone, History of the telephone, Timeline of the telephone
December 1894: In Italy, Guglielmo Marconi conducts experiments in pursuit of building a wireless telegraph system based on Herzian waves (radio), demonstrated a radio transmitter and receiver to his mother, a set-up that made a bell ring on the other side of the room by pushing a telegraphic button on a bench.
The following outline is provided as an overview of and topical guide to telecommunication: . Telecommunication – the transmission of signals over a distance for the purpose of communication.
VLC can be possibly used in a wide range of applications including wireless local area networks, wireless personal area networks and vehicular networks, among others. [17] On the other hand, terrestrial point-to-point OWC systems, also known as the free space optical (FSO) systems, [18] operate at the near IR frequencies (750–1600 nm).
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