Telecommunication
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 included visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs.
Other examples of pre-modern long-distance communication included audio messages such as coded drumbeats, lung-blown horns, and loud 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
- Computer network
- Electricity
- Entropy
- Free-space optical communication
- Information theory
- Radio
- Wi-Fi
- Wireless
External Link s
- Telecommunication @ Wikipedia
