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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]
Door phone plates consist of a matrix of buttons. each of them drive a buzzer located in a unit inside each apartment building. Each apartment building contains a button that can activate the electric strike. There are several installation systems, the most traditional being a system known as 4 + 1, named for the types of wiring that it ...
Current detecting system [96] 21 June 1960: US 3253272 A: Coded alarm station [97] 09 Aug 1961: US 3164697 A: Rotary armature miniature relay [98] 23 Jan 1963: US 3230296 A: Contact terminal assembly with different geometric configured contacts on either side of a plate [99] 04 Mar 1963: US 3226520 A: Illuminated push button switch assembly ...
The most commonly used telephone sets for the 1A2 systems were modifications of the Bell System standard 500-series telephones for rotary dial systems, and the 2500-series Touch-Tone desk sets. For key system operation these sets were equipped with a set of push-buttons ( keys ) and additional internal contact springs to control the additional ...
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
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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