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Media and communications

Telecommunications satelliteTelecommunications is the sending and receiving of information using electricity, radio waves or light. The information can be data, sound or TV pictures. Data can represent text, sounds, images or video. Forms of telecommunications include the internet and other computer networks, phones, two-way radio and TV and radio broadcasting. Phone calls, text messages, emails and computer data—and often radio and TV signals as well—travel through a vast communications network.



A satellite communication dish in Bavaria, Germany. This type is called a Cassegrain antenna. The radio waves pass through a hole...Read More >>A satellite communication dish in Bavaria, Germany. This type is called a Cassegrain antenna. The radio waves pass through a hole in the centre of the dish and are focused on a small dish fixed in front of the main one. The waves are reflected back toward the main dish, which sends them as an outgoing beam directed towards a telecommunications satellite.

Networks

All the different forms of telecommunications are turned into signals that can travel through the network. A network may be made up of telephone lines, cables, and radio and satellite links. Signal always travel between two points on the network (such as two mobile phones) and are directed through it by electronic switches. This is called a switched network. Radio and television networks, where signals are sent to many receivers from one transmitter, are known as broadcast networks.
A diagram of a telecommunications network, showing links between a cellular telephone network (for mobiles), landline telephones,...Read More >>A diagram of a telecommunications network, showing links between a cellular telephone network (for mobiles), landline telephones, computers, internet service providers, exchanges and a telecommunications satellite.
Wiring at a telephone exchange

Exchanges

The word telecommunication comes from the Greek word tele, meaning "at a distance", and the Latin communicare, meaning "to share".

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