An intercom system allows complete paging and communication between phones and intercom stations within a building or group of buildings .

Larger systems might connect all of the rooms in a school or hospital to a central office. Intercoms in larger buildings often function as public address systems, capable of broadcasting announcements.

Intercoms are generally composed of:

• Master Station - These are units that can control the system, i.e., initiate a call.
• Sub-stations - Units not capable of initiating calls sometimes called slave units.
• Door Stations - Like sub-stations, these units are not capable of initiating a call. They are typically weather-proof.
• Power Supply - Used to feed power to all units.

The system also features industrial intercom speaker zones, clock and program, dial-in activation, system supervision options, emergency tone distribution and signaling output circuits. The intercom devices are available as rugged industrial stations or handsets, or as an attractive two-piece telephone that is ideal for any commercial or institutional environment.

Benefits to Intercom Systems:

• Communication between individuals remains private
• Simple and fast communication between locations
• Easy installation
• Inexpensive solution (compared to paging systems}