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What (who) is telecommunication$82021$ - definition
TELEPHONE SERVICE FEATURE
Redial (Telecommunication); Redial (telecommunication)
Chongqing Communication Institute
UNIVERSITY IN CHONGQING, CHINA
Chongqing Telecommunication Institute
Chongqing Communication Institute (), also known as Chongqing Telecommunication Institute, is a college located in Geleshan, Shapingba District in the Chinese municipality of Chongqing. Founded in 1950, the college is best known for its contribution to the field of information technology.
Optical communication
![Chappe's]] [[semaphore tower]]s (18th century).](https://commons.wikimedia.org/wiki/Special:FilePath/OptischerTelegraf.jpg?width=200 "Chappe's]] [[semaphore tower]]s (18th century).")
![An [[air traffic controller]] holding a signal light gun that can be used to direct aircraft experiencing a radio failure (2007).](https://commons.wikimedia.org/wiki/Special:FilePath/TC with light gun.JPG?width=200 "An [[air traffic controller]] holding a signal light gun that can be used to direct aircraft experiencing a radio failure (2007).")
COMMUNICATION AT A DISTANCE USING LIGHT TO CARRY INFORMATION
Optical communications; Optical telecommunications; Optical telecommunication; Optical data communication
Optical communication, also known as optical telecommunication, is communication at a distance using light to carry information. It can be performed visually or by using electronic devices.
Telecommunication control unit
DEVICE ATTACHED TO A COMPUTER MULTIPLEXER CHANNEL WHICH SUPPORTS MULTIPLE TERMINALS
Telecommunication Control Unit
A telecommunication control unit (TCU), line control unit, or terminal control unit (although terminal control unit may also refer to a terminal cluster controller) is a Front-end processor for mainframes and some minicomputers which supports attachment of one or more telecommunication lines. TCUs free processors from handling the data coming in and out of RS-232 ports.
Wikipedia
Automatic redial
In telecommunication, an automatic redial is a service feature that allows the user to dial, by depressing a single key or a few keys, the most recent telephone number dialed at that instrument.
Note: Automatic redial is often associated with the telephone instrument, but may be provided by a PBX, or by the central office. Synonym last number redial. Contrast with automatic calling unit.
Often one must subscribe to a caller ID for use of this function on a landline.
