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Telephony ( / təˈlɛfəni / tə-LEF-ə-nee) is the field of technology involving the development, application, and deployment of telecommunication services for the purpose of electronic transmission of voice, fax, or data, between distant parties. The history of telephony is intimately linked to the invention and development of the telephone .
Call waiting - a system that notifies a caller of another incoming telephone call by sounding a sound in the earpiece. Called party - (or callee or B-party) Caller. Calling party. Conference call (multi-party call) COCOT.
A cordless telephone or portable telephone has a portable telephone handset that connects by radio to a base station connected to the public telephone network. The operational range is limited, usually to the same building or within some short distance from the base station. A cordless telephone differs functionally from a mobile telephone in ...
The Telephones Portal. A rotary dial telephone, c. 1940s. A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be easily heard directly. A telephone converts sound, typically and most efficiently the human voice, into electronic signals that are transmitted via cables ...
Portal frame is a construction technique where vertical supports are connected to horizontal beams or trusses via fixed joints with designed-in moment -resisting capacity. [1] The result is wide spans and open floors. Portal frame structures can be constructed using a variety of materials and methods.
In March 1972, Atalla filed U.S. patent 3,938,091 for his PIN verification system, which included an encoded card reader and described a system that utilized encryption techniques to assure telephone link security while entering personal ID information that was transmitted to a remote location for verification.
Thermally activated delayed fluorescence. Thermally activated delayed fluorescence (TADF) is a process through which a molecular species in a non-emitting excited state can incorporate surrounding thermal energy to change states and only then undergo light emission. The TADF process usually involves an excited molecular species in a triplet ...
The Telecommunication Portal. Telecommunication, often used in its plural form, is the transmission of information with an immediacy comparable to face-to-face communication. As such, slow communications technologies like postal mail and pneumatic tubes are excluded from the definition. Many transmission media have been used for ...
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