October 26, 2017

Intercom

 

An intercom system is a two-way communication electronic device that contains circuitry for the purpose of transmitting and receiving audio and/or video transmissions.

With the advent of cellular communication, digital telephone systems, and other communication devices, the use of intercoms has declined. However, there are still lots of applications where these devices still work better than anything else. There are a very wide variety of systems available as defined below:

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 In applications where wires cannot be run, a wireless system is used.

There are a broad spectrum of two-way wireless communication devices

that include such devices as handheld radios, outdoor wireless callboxes,

as well as traditional desktop devices.

The range these units will transmit varies widely based on the wireless technology used.

 

 

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 When you can run wires between locations,

 a wired system can give you a little more privacy and eliminate

possible interference from neighboring systems.

There are different wire types such as 2-wire shielded or Cat-5/6

 that can be used with these systems.

 If you are considering a video system, a wired unit may be the best solution.

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 These typically have a unit that has a camera,speaker,

and a push button that goes at an entrance door, and an internal monitor unit

 that can communicate with the entrance unit.

 Some systems can have multiple video monitors internally.

Given the difficulty of sending video over the airwaves at very much

 distance without interference, most available units are wired.

 

 

 

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This type of system has a door unit at an entrance door

and then each apartment or flat has either one

or multiple units that can speak to the door and possibly see the visitor,

or the door unit rings a landline or cellular telephone number.

A visitor simply  presses the correct button for the apartment

 they want to speak to, and the tenant can speak back and then

press a button to unlock the door.

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While these are technically not intercoms, there are two-way radios

that communicate  with base station intercoms.

So you can have  the flexibility of a mobile radio that communicates

 over long distances mixed with the capability  a fixed intercom gives you.