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  2. 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]

  3. 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 ...

  4. 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.

  5. Communications system - Wikipedia

    en.wikipedia.org/wiki/Communications_system

    An optical communication system is any form of communications system that uses light as the transmission medium. Equipment consists of a transmitter, which encodes a message into an optical signal, a communication channel, which carries the signal to its destination, and a receiver, which reproduces the message from the received optical signal.

  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. S.H. Couch - Wikipedia

    en.wikipedia.org/wiki/S.H._Couch

    Couch F5GX non-coded fire alarm pull station and F294 10" bell.. The firm S. H. Couch, often known as simply Couch, was a Quincy, Massachusetts, manufacturing company founded circa 1901 in Boston [1] [2] [3] after the dissolution of Whitman & Couch, a partnership, and a second entity known as Couch & Seeley. [4]

  8. 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]

  9. Video door-phone - Wikipedia

    en.wikipedia.org/wiki/Video_door-phone

    A video door-phone (also known as a video door entry or video intercom) is a stand-alone intercom system used to manage calls made at the entrance to a building (residential complex, detached family home, workplace, etc.) with access controlled by audiovisual communication between the inside and outside. The main feature of video door entry is ...

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