<- Virtual Exhibitions in Informatics

Telecommunication

The word telecommunication was adapted from the French word télécommunication. It is a compound of the Greek prefix tele- (τηλε-), meaning 'far off', and communication, meaning 'exchange of information'. Telecommunication is the transmission of signals over a distance for the purpose of communication. Nowadays, telecommunication is widespread and devices that assist the process such as the television, radio and telephone are common in many parts of the world. There is also a vast array of networks that connect these devices, including computer networks, public telephone networks, radio networks and television networks.

Elements needed for the telecommunication:

  • transmitter that takes information and converts it to a signal for tranmission (sender)
  • transmission medium over which the signal is transmitted (e.g. air, wire)
  • receiver that receives and converts the signal back into usable information (receiver e.g. radio)

Telecommunication over a phone line is called point-to-point communication because it is between one transmitter and one reciever, telecommunication through radio broadcasts is called broadcast communication because it is between one powerful transmitter and numerous receivers. A collection of transmitters, receivers or transceivers that communicate with each other is known as a network. The transmitted signals can be analogue or digital. In an analogue signal, the signal is varied continuously with respect to the information. In a digital signal, the information is encoded as a set of discrete values. The shaping of a signal to convey information is known as modulation. Modulation is a key concept in telecommunications and is frequently used to impose the information of one signal on another.



Further information and links:

The FHTE Web History of Telecommunications
History of telecommunication
History of telecommunication
Telecommunication
History of Telecommunications Towers