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 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