Traditional intercoms and public address systems are composed entirely of analogue electronics components but many new features and interfacing options can be accomplished with new intercom systems based on digital connections. Video signals can be carried as well as voice. Digital intercom stations can be connected using Cat 5 cable and can even use existing computer networks as a means of interfacing distant parties.

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Many apartment buildings, privet houses and office buildings now use audio / video systems to identify visitors trying to gain access to a locked building, and can be interfaced with the building’s access control system.




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