General Information

Intercom - is an electronic intercom that allows two-way communication at a distance without direct contact and is designed to ensure the security of residential, office, work premises.

According to the number of subscribers intercoms are divided into two classes:

1) few-subscriber - installed at the entrance to the office, apartment;

2) Multi-subscriber - installed in apartment buildings, office centers. 

Multi-door intercoms are divided by the principle of operation:
 - to coordinate-matrix (analog),
 - digital.

By the type of signal provided to allocate:

1) video intercoms, 

2) audio intercoms, 

3) wireless video intercoms.

Video phone makes it possible to identify the visitor and to establish not only verbal, but also visual contact by transmitting a black and white or color pictures on the monitor screen.

With additional installation remotely controlled lock the video phone turns into a simple access control system, and when you connect the cameras - in the video surveillance complex. There are many manufacturers of video intercom and you need to choose the one that is suitable for you. It could be a budget model such as doorking intercom or something more modern such as BAS-IP

                                     Components of the intercom

Calling panel (outside panel)

 Mounted in front of the building. For outdoor installation a vandal-proof version is used. In addition to the camera panel also includes a microphone and speaker for voice communication, call buttons with lighting and reader electronic key or a smart card. To ensure the device works at night, infrared light is used. In audio-door camera and infra-red backlight is absent. Calling panel operates at temperatures from -40 ° C to +60 ° C and provides the ability to connect multiple video intercoms. Typically, a video doorphone uses multiple video panels. 

Switchboard

 Passes the call signal to the indoor station, which code was dialed on the outside panel, and after answering the caller provides audio or video communication between the visitor and subscriber. 

Subscriber device. 

With the subscriber device you can see the visitor and talk to him. Consists of a microphone, speaker, monitor for conversations, and answer and remote lock control buttons.
Monitor indoor station video device Allows you to watch the space in front of the place of installation call panel (camera), regardless of the presence of a call. Up to 4 cameras can be connected to one unit.