Telecommunications

Telecommunication is the assisted transmission of signals over a distance for the purpose of communication. In earlier times, this may have involved the use of smoke signals, drums, semaphore, flags, or heliograph. In modern times, telecommunication typically involves the use of electronic transmitters such as the telephone, television, radio or computer. Early inventors in the field of telecommunication include Antonio Meucci, Alexander Graham Bell, Guglielmo Marconi and John Logie Baird. Telecommunication is an important part of the world economy and the telecommunication industry's revenue has been placed at just under 3 percent of the gross world product.
Contents
1 Key concepts
1.1 Basic elements
1.1.1 Analogue or digital
1.1.2 Networks
1.1.3 Channels
1.1.4 Modulation
2 Society and telecommunication
3 History
3.1 Early telecommunications
3.2 Telegraph and telephone
3.3 Radio and television
3.4 Computer networks and the Internet
4 Modern operation
4.1 Telephone
4.2 Radio and television
4.3 The Internet
4.4 Local area networks
5 Telecommunications by region