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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]
Such systems work similarly to normal wired intercom designs, with intercom stations using wires to connect to electrical outlets in rooms. This method of intercom connection is most useful in offices and homes served by a single electrical service. Products are available from a variety of manufacturers including Westinghouse and GE. [6] [7]
Each connection to a telephone set required six wires from the key system: [5] One pair (two wires) carried the talk circuit (tip and ring), one pair carried control information, known as A-Leads, for that line, designated A and A1, and the third pair carried current to a lamp for the specific line key position on the telephone set (L and LG).
For an example, a school is an environment that displays all the capabilities of an intercom telephone. Using an intercom telephone, administrators can make announcements over loudspeakers that are heard by the entire building, but they can also call a specific classroom 's intercom by dialing the room number of that classroom.
The "United" version of NX-2A replaced the intercabling connection blocks with wire wrap connections so that switches could be installed or expanded without having custom cable harnesses provided by North Electric. Switcher Family (NX-2A pre-installed in a trailer for rapid installation or portable/emergency use)
The pair of wires from the central office switch to a subscriber's home is called a subscriber loop. It carries a direct current (DC) voltage at a nominal voltage of −48V when the receiver is on-hook, supplied by a power conversion system in the central office. This power conversion system is backed up with a bank of batteries, resulting in ...
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