Determination of intercom configuration. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Determination of intercom configuration. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Security and safety. Audio and video surveillance

Supply intercoms The consumer is carried out, as a rule, in the form of separate blocks, from which it is possible to build intercom systems of various configurations, and the use of microprocessor technology and modern technologies gives intercoms wide functionality.

It is very difficult to understand all this diversity and offer an acceptable option to the customer (in most cases, unfamiliar with this technique).

Acquaintance with a specific intercom model is recommended to start by finding out the following details:

- the maximum number of subscribers that the intercom can serve (it must be greater than or equal to the actual number of subscribers served);

- the required number of subscriber units (at the request of the subscriber, several units can be installed);

- type of apartment owner identification device. It can be the following miracles of technology: a code, an ordinary key, an optical or magnetic card, an electronic key Touch memory;

- the maximum number of codes, which should exceed the maximum number of subscribers served.

Most Common Configurations individual и access intercoms.

two-wire individual video intercom is one of the easiest. The intercom consists of external and internal blocks. An additional device designed to create maximum convenience is an audio tube installed in another room, with which you can talk with a visitor without going to the monitor.

Expanded individual video intercoms built on the basis of four-wire modules have found wide application in multi-room apartments and small offices.

The design of such an intercom provides for the presence of one external unit (camera), two internal units (monitors) and an additional audio tube. The indoor units and the audio tube are installed in different rooms. The electric lock is controlled from each of these devices. For apartments and offices with two entrances, extended individual intercoms with two external and one internal blocks are used. The intercom is also built on the basis of four-wire modules. One external block is installed for each input. At the same time, the indoor unit, turning on a call from any of the doors, can control the electric locks on all doors.

To create increased reliability when equipping facilities with intercom systems, the principle of two-level protection is often used (this mainly applies to video intercoms). The first level forms an access intercom that limits the entrance to the entrance, the second - individual or group intercoms installed on the doors of apartments and closed halls.

Configuration as single level entrance audio intercom, and a two-level access video intercom can be selected individually for each case. For example, the first level forms an access audio intercom, and the second - individual or group audio intercoms (or video intercoms).

Author: Korshevr N.G.

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