TEMA TELECOMUNICAZIONI SRL
Doorphone AA-514
MAS-AA514-REV03EN
Page 28 of 56
8.3.4. Connection of the base system AA-514C with camera
In the system AA-514C is housed a camera
equipped with a video cable terminated with
a female RCA connector.
At this connector is already possible to
connect a monitor that has a video input.
This could be useful for making a test before
the installation and normally the video signal
is not carried out on long distances using this
type of connection.
Rather than providing a shielded cable
between the doorphone and the operator
monitor is more practical to use the "balun"
interfaces (balancer-unbalancer) and bring
the signal using a twisted telephone pair.
Typically, it is possible to use one of the pairs
of an UTP cat.5 cable.
Supplied with the system is present an
accessory that plugs into the RCA video
connector on the system AA-514C and
transforms it in an output screw terminals for
connecting the telephone pair described
above. This accessory is suitably protected
against accidental contacts being electrically
insulated from its metal parts with the use of
a special protective thermoformed cover.
Immediately near the operator monitor must
be connected on the same pair another
"balun" (also supplied with the unit) who will
present the video signal to the monitor on a
male BNC connector which can further be
linked to other adapters (BNC to RCA etc.)
according to the type of monitor input to be
connected.
Using supplied baluns the maximum cable
length between AA-514C and the monitor is
around 300 meters.
Connect wires of the pair to the baluns, in the
same way, respecting the same polarity.
Video
Video out connector of the built-in camera.
Female RCA connector.
Adapter
Supplied accessory kit for connecting the
video signal on twisted pair cable, normal
telephone twisted-pair.
Cable Out
Terminals for the connection of twisted pair to
transport the video signal.
Make the connection of the twisted pair and
insert the adapter into the connector of the
camera, put it all back in the plastic back so
that it does not create too much bulk to the
board, allowing the correct closure of the
front of the system.
AA-514C
Video out
UTP
pair/cable
300 meters
maximum Local
adapter
.
.
Remote
adapter