For several decades, a device such as an intercom has been protecting many tenants. This is a very convenient device, as it reduces the access of unwanted persons to the house. This reduces the number of apartment thefts and damage in the interior of the house (stairwells, basements, and so on). Codes for intercoms allow programming calls to internal numbers of apartments. It is very convenient, and thus you can protect yourself from unwanted situations.
Doorphone device
This device, as a rule, is a system that includes several nodes:
- Call bar. This device is anti-vandal and is mounted in front of the entrance. The panel is equipped with a numeric keypad (where you can dial codes for intercoms), a backlight, a smart card or key reader, as well as a hidden camera.
- Subscriber device. It serves to ensure negotiations between the landlord and the guest. With an external camera, this device is equipped with a screen on which you can see the identity of the visitor.
- Switch. This device is installed only in apartment buildings. It serves as a connection during negotiations, sends a signal to the apartment and so on.
- Constipation device. This node allows you to control the lock on the front door using the intercom. In this case, a signal is sent to the electric lock from the internal device.
Types of intercoms
There are several types of this device:
- Multi- and low-subscriber intercoms. The first option is devices that provide protection for multi-storey residential buildings, the second type is used, as a rule, in private suburban buildings.
- Digital devices. A feature of these devices is that for each subscriber there is a certain dialer number. Also, the installation is simple and resistant to hacking. In this case, codes for intercoms are dialed for dialing.
- Analog (coordinate matrix) intercoms. This type of device is the most common, although it has several disadvantages. So, when installing a system of this type requires more costs; Also, in case of failure of the device of one subscriber, other apartment owners may also fail.
- Audio and video on-door speakerphones.
Useful Tips
For users of these devices, the following information may be useful.
- If the keys for intercoms are lost, you can order a duplicate in special organizations.
- When choosing protection devices, one can be guided by such moments: installing radio intercoms will be less costly if you do not need to make a hole in the wall. Digital devices also record on a video camera in chronological order (like an answering machine), which allows you to view visits at different times.
- As you know, codes for intercoms are not sufficient protection, and this feature is often turned off. Instead, they began to use special keys, which can be issued in various versions (key rings, plastic cards or keys in the form of tablets).
- Previously released models may skip universal codes for intercoms. Since this has become the cause of abuse, this feature is also disabled by the installers. In later releases there is no such possibility of “free” access.
On-door speakerphones are by far the best way to protect against unwanted visitors from entering the house. Moreover, these devices are modified over time: the functions become more complex, new control capabilities appear, and the level of prevention of break-ins and cases of vandalism increases.