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Given this growth, telecommunications play an increasingly important role in the world economy and the global telecommunications industry was about a $4.7 trillion sector in 2012. [ 39 ] [ 40 ] The service revenue of the global telecommunications industry was estimated to be $1.5 trillion in 2010, corresponding to 2.4% of the world's gross ...
Telecommunication – the transmission of signals over a distance for the purpose of communication. In modern times, this process almost always involves the use of electromagnetic waves by transmitters and receivers, but in earlier years it also involved the use of drums and visual signals such as smoke , fire , beacons , semaphore lines and ...
A telecommunications network is a group of nodes interconnected by telecommunications links that are used to exchange messages between the nodes. The links may use a variety of technologies based on the methodologies of circuit switching , message switching , or packet switching , to pass messages and signals.
Telecommunications company; ITU-T; Landline; List of mobile network operators. List of mobile network operators of the Americas; List of mobile network operators in Asia and Oceania
Telecommunications Services United States 60,286.87 01/26/2000 Shareholders Other Financials Canada Nortel Networks Corp Telecommunications Equipment Canada 59,973.57 06/14/1999 Qwest Commun Intl Inc Telecommunications Services United States US WEST Inc Other Telecom United States 56,307.03 06/24/1998 AT&T Corp Telecommunications Services
The history of telecommunication began with the use of smoke signals and drums in Africa, Asia, and the Americas. 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. This article details the history of telecommunication and the ...
Communication system An electronic communications system using electronic signals. A communications system or communication system is a collection of individual telecommunications networks systems, relay stations, tributary stations, and terminal equipment usually capable of interconnection and interoperation to form an integrated whole.
A cellular network or mobile network is a telecommunications network where the link to and from end nodes is wireless and the network is distributed over land areas called cells, each served by at least one fixed-location transceiver (such as a base station).