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  2. Two-way communication - Wikipedia

    en.wikipedia.org/wiki/Two-way_communication

    When information is exchanged between superior and subordinate, it is known as vertical two-way communication. On the other hand, when communication takes place between persons holding the same rank or position, it is called horizontal two-way communication. Two-way communication is represented in the following diagrams: [3]

  3. Telecommunications - Wikipedia

    en.wikipedia.org/wiki/Telecommunications

    These sites allow users to communicate with each other as well as post photographs, events and profiles for others to see. The profiles can list a person's age, interests, sexual preference and relationship status. In this way, these sites can play important role in everything from organising social engagements to courtship. [56]

  4. Trunked radio system - Wikipedia

    en.wikipedia.org/wiki/Trunked_radio_system

    A trunked radio system is a two-way radio system that uses a control channel to automatically assign frequency channels to groups of user radios. In a traditional half-duplex land mobile radio system a group of users (a talkgroup) with mobile and portable two-way radios communicate over a single shared radio channel, with one user at a time ...

  5. Two-way radio - Wikipedia

    en.wikipedia.org/wiki/Two-way_radio

    Naval air traffic controller communicates with aircraft over a two-way radio headset A variety of portable handheld two-way radios for private use. A two-way radio is a radio transceiver (a radio that can both transmit and receive radio waves), which is used for bidirectional person-to-person voice communication with other users with similar radios, [1] in contrast to a broadcast receiver ...

  6. Radio - Wikipedia

    en.wikipedia.org/wiki/Radio

    The word radio is derived from the Latin word radius, meaning "spoke of a wheel, beam of light, ray".It was first applied to communications in 1881 when, at the suggestion of French scientist Ernest Mercadier [], Alexander Graham Bell adopted radiophone (meaning "radiated sound") as an alternate name for his photophone optical transmission system.

  7. Communication - Wikipedia

    en.wikipedia.org/wiki/Communication

    The word communication has its root in the Latin verb communicare, which means ' to share ' or ' to make common '. [1] Communication is usually understood as the transmission of information: [2] a message is conveyed from a sender to a receiver using some medium, such as sound, written signs, bodily movements, or electricity. [3]

  8. Walkie-talkie - Wikipedia

    en.wikipedia.org/wiki/Walkie-talkie

    A walkie-talkie, more formally known as a handheld transceiver, HT, or handheld radio, is a hand-held, portable, two-way radio transceiver.Its development during the Second World War has been variously credited to Donald Hings, radio engineer Alfred J. Gross, Henryk Magnuski and engineering teams at Motorola.

  9. Videotelephony - Wikipedia

    en.wikipedia.org/wiki/Videotelephony

    Videotelephony (also known as videoconferencing or video calling) is the use of audio and video for simultaneous two-way communication. [1] Today, videotelephony is widespread. There are many terms to refer to videotelephony. Videophones are standalone devices for video calling (compare Telephone).