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An intercom is an electronic communications system within a home/office or a building. Intercoms are generally composed of fixed microphone/speaker units which connect to a central control panel. A small home intercom might connect a few rooms in a house. Larger systems might connect all of the rooms in a school or hospital to a central office.
- Master Station - These are units that can control the system, i.e., initiate a call with any of the stations.
- Sub-stations - Units that are capable of only initating a call with a Master Station but not capable of initiating calls with any other stations (sometimes called slave units).
- Door Stations - Like sub-stations, these units are only capable of initiating a call to a Master Station. They are typically weather-proof.
- Power Supply - Used to feed power to all units.
An intercom may be connected to a door buzzer
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