Glossary - LEGRAND D45 SYSTEM Installation Manual

glossary

ENTRANCE PANEL
Term used to indicate the device
outside the building, from which the
internal unit can be called.
INTERNAL UNIT
individual video/audio or audio only
device for the identification of the
individual making the call from the
entrance panel. normally, in addition
to communicating with the entrance
panel, the internal unit also gives
the possibility of performing other
actions, such as the release of the
door lock, intercom calls, automatic
switching on, etc.
BACKBONE
it provides the connection between
entrance panel and distributes the
signal to.
RISER
it is the set of vertical wiring
connecting the internal units with
the power supply.
FLOOR SHUNT
Hub for the connection of video/
audio and audio only internal units,
apartment interfaces, and additional
power supplies.
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OUTSIDE THE DOOR
Set of audio and video devices that
give the possibility of making a call
to the internal unit/s and to identify
the individual making the call. it
is normally installed to make calls
from areas inside the building (hall,
secondary entrances, etc.).
AUTO-SWITCHING ON
Functions providing audio and video
communication between internal
unit and entrance panel, or internal
unit and outside the door unit,
without a call being received.
INTERCOM
Function that provides audio
communication between two
internal units.
MASTER
it is the video internal unit that turns
on when a call is received.
SLAVE
it is the video internal unit connected
in parallel to the master video
internal unit, and which rings but
does not turn on when a call is
received (it only turns on when the
call is answered).
IN / OUT
Connection of the devices where two
clamps act as node between the in
twisted pair and the ouT twisted pair.
CAT 5E AND CAT 6 CABLE
data transmission cables made up of
four pairs arranged inside a sheath
according to a specific layout, which
is necessary to reduce attenuation
and crosstalk problems. This layout
consists of twisting the pairs of
conductors individually. These
pairs are identified using standard
colours. each of the pairs has a
different pitch, and is in turn twisted
differently inside the outer sheath.
The conductor size permitted by
the standards is between 22 and 26
aWg: 24 aWg is the most commonly
used in all cases and corresponds to a
diameter of 0.5 mm.
The acronym aWg (american Wire
gauge) corresponds to the unit of
measurement used by the american
standards to measure the cross-
sections of cables.
as it is a ratio, the smallest cross-
sections correspond to the largest aWg
sizes. The appropriateness of using
cables with different types of sheath
must be assessed according to the area
in which the wiring system is installed.
The most commonly used cable
sheath is PVC or LSZH (Low
SmokeZero Halogen).
D45 SyStEm GUIDE 5