Telecommunication
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Telecommunication is exchange of information between two entities using machines.
Description
Communication technology uses channels to transmit information (as electrical signals), either over a physical medium (such as signal cables), or in the form of electromagnetic waves.
The word is often used in its plural form -- telecommunications -- because it involves many different technologies.
History
Early means of communicating over a distance include visual signals such as:
- Beacons
- Smoke signals
- Semaphore telegraphs
- Signal flags
- Optical heliographs
Other examples of pre-modern long-distance communication include audio messages such as:
- Coded drumbeats - see Talking drum
- Horns
- Whistles
Modern technologies for long-distance communication usually involve electrical and electromagnetic technologies, such as:
- Telegraph
- Telephone
- Teleprinter
- Computer networks
- Radio
- Microwave transmission
- Fiber optics
- Communications satellites
See also
- Bandwidth (computing)
- Checksum
- Communication
- Computer network
- Data transmission
- Electricity
- Entropy
- Error detection and correction
- Free-space optical communication
- Information theory
- Near field communication
- Radio
- Telecommunications network
- Wi-Fi
- Wireless
External Link s
- Telecommunication @ Wikipedia
