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Our electronic door entry and video door entry systems provide
security for the home, allowing the user a simple way of controlling
the access of outsiders to his or her property.
With ALCAD’s digital system, any configuration of electronic door
entry or video door entry system can easily be performed in medium-
and large-scale installations. Our microprocessor-based technology
places control of different points of entry in the entrance panels them-
selves, thus eliminating the need for additional control equipment,
such as selector-changers. This, along with the simplicity of the
wiring involved, the overall ease of installation and the numerous
configuration options, makes ALCAD’s digital system one of the most
user-friendly and technically advanced solutions for this type of ins-
tallation. (For further information, see “General features of the digi-
tal electronic door entry and video door entry system” on page 7.)
One of the main characteristics of the digital system is the con-
nection in parallel of the different elements of the installation by
means of a BUS-type connection. The BUS enables communication
between the different elements of the installation as well as the trans-
mission of the audio signal in both directions. Communication
between the elements is digital, so that each element of the installa-
tion can generate and interpret digital streams. The BUS-type con-
nection makes it possible to eliminate the separate call wire for each
dwelling since, in this system, the number of wires in the installation
does not depend on the number of houses or flats. In place of the call
wire, a specific identifying code is assigned to the telephones or
monitors of each dwelling. Assigning such a code to each device is
known as “programming” the various devices. (See “Identifying
devices in the house or flat” on page 6.)
The system consists primarily of the following elements:
Entrance panel
Usually installed at the point of entry to the building, this element
houses an audio unit and a series of pushbuttons (an entrance panel
with pushbuttons) or a numeric keypad (an entrance panel with key-
pad) and is used to call the telephone of monitor of each dwelling.
Thus, we speak of the digital system with pushbutton entrance
panel or of the digital system with keypad entrance panel, depen-
ding on which kind of entrance panel is used. Note, however, that
it is possible to carry our installations combining both types of
entrance panel.
In video door entry installations, the entrance panel also houses a
video unit, whose function is to capture the image of the person
making the call.
On the entrance panel with pushbuttons, each pushbutton corres-
ponds to a given dwelling; consequently, the number of dwellings
determines the number of pushbuttons. The method of calling a
house or flat is the same as that used in a conventional electronic
door entry or video door entry system, i.e. the caller presses the
pushbutton corresponding to the dwelling.
With the keypad entrance panel, on the other hand, to make a
DESCRIPTION
DOOR ENTRY AND VIDEO DOOR ENTRY
SYSTEMS. DIGITAL SYSTEM
1
call to a particular dwelling the visitor must use the numeric key-
pad of the entrance panel to key in the code which has been
assigned to the telephone or connection bracket of that dwelling
during the programming process.
A defining feature of the entrance panel with keypad is that it
is possible to use the panel itself to select the values of certain
operating parameters (e.g. type of call tone, number of times the
call tone is repeated, time allowed for answering a call, time
allowed for conversation, etc.), which can be adapted to the
specific needs of each installation. Likewise, with this type of
entrance panel it is possible to activate the electric lock directly
by using the keypad to key in a previously defined code. (See
“Configuration options of entrance panels with keypad” on
page 13.)
Elements for the distribution of the video signal (in
video door entry installations)
Tap-offs and splitters are used to distribute the video signal
from the video unit to the different dwellings. The tap-offs,
usually installed on each floor of the building, allow the video
signal to be branched to the different monitors of the installation.
The splitters are used when several up lines or columns of video
are required.
Telephone or monitor + connection bracket
Installed in the house or flat, the telephone and the monitor
are the elements allowing a call made from the entrance panel
to be received. They establish communication with the visitor
and, by means of the door-opening button, allow him access to
the property. The connections bracket is used to install and con-
nect the monitor in the dwelling.
Electric lock
The electric lock is an electro-mechanical device which, insta-
lled at the entry point or door being controlled, allows the door
to be opened when the door-opening button on the telephone or
monitor in the dwelling is pressed, or, in the case of entrance
panels with keypad, when one of the pre-set door-opening codes
is keyed in).
Power supply units
Like any other electronic system, digital door entry and video
door entry systems need an external power supply in order to
function. This is provided by the power supply units which
supply the required voltages from the mains. Power supply units
are usually located in the hall of the ground floor or in a com-
mon area of the building.
Note: For more information on the components or elements
to use in an installation of digital electronic door entry or video
door entry systems, see the section entitled “Components” on
page 40.
