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  2. Clear-Com - Wikipedia

    en.wikipedia.org/wiki/Clear-Com

    The product line of Clear-Com has expanded beyond party-line wired units to include multi-channel intercoms and wireless technology. Clear-Com patented a multi-channel wired digital intercom system in 2009, used in the HelixNet product line. The company's FreeSpeak wireless intercom was nominated in 2020 for a TEC Award. [7]

  3. Intercom - Wikipedia

    en.wikipedia.org/wiki/Intercom

    1980s MirTone intercom system. An intercom, also called an intercommunication device, intercommunicator, or interphone, is a stand-alone voice communications system for use within a building, small collection of buildings or portably within a small coverage area, which functions independently of the public telephone network. [1]

  4. Setcom Corporation - Wikipedia

    en.wikipedia.org/wiki/Setcom_Corporation

    In 1994, the System 1300 intercom was designed for Aircraft Rescue and Firefighting vehicles (ARFF) that had the first ever split audio function available on the market. The System 1300 intercom went on to become the industry standard for U.S. airports to have on their trucks because of the practicality and safety factors. In 2000, the System ...

  5. Communications-based train control - Wikipedia

    en.wikipedia.org/wiki/Communications-based_train...

    The CBTC systems integrate a digital networked radio system by means of antennas or leaky feeder cable for the bi-directional communication between the track equipment and the trains. The 2,4 GHz band is commonly used in these systems (same as WiFi ), though other alternative frequencies such as 900 MHz ( US ), 5.8 GHz or other licensed bands ...

  6. Wireless intercom - Wikipedia

    en.wikipedia.org/wiki/Wireless_intercom

    There are many types of wireless intercom systems on the market. Most wireless intercom systems communicate by radio waves using one of the frequencies allotted by various government agencies. Some wireless intercom systems communicate using the 802.11 standard. [1] There are also systems that advertise themselves as wireless, but communicate ...

  7. List of telephone switches - Wikipedia

    en.wikipedia.org/wiki/List_of_telephone_switches

    HS 31 (new developed register system, introduced in 1931, based on a new flat type relay and a 100-point two-motion selector, suitable for small and large exchanges) HS 52 (new developed register system, introduced in 1953, based on a new 120-point selector, which was in fact a 4 x 30-point uniselector with 2 x 4 brushes offset by 180°, no ...

  8. Interruptible foldback - Wikipedia

    en.wikipedia.org/wiki/Interruptible_foldback

    Interruptible foldback (IFB), also known as interrupted foldback, interruptible feedback, or interrupt for broadcast, is a monitoring and cueing system used in television, filmmaking, video production, and radio broadcast for one-way communication from the director or assistant director to on-air talent or a remote location.

  9. Intercom telephone - Wikipedia

    en.wikipedia.org/wiki/Intercom_telephone

    An intercom telephone is a special kind of telephone that controls an intercom system. Intercom telephones can be found in residential, commercial, and educational settings. [1] For an example, a school is an environment that displays all the capabilities of an intercom