FARFISA INTERCOMS ECHOS, Техническое руководство

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51
(MT11 - Gb2012)
1+1
INTERCOMS *
4+1
VIDEOINTERCOMS
CONNECTION WITH FLOOR DISTRIBUTORS
The video wires of each video intercom are insulated from the riser.
Connections are made on the DV2D or DV4D floor video signal distribu-
tor box.
Technical data
Power supply
15÷21Vdc
Operating current 60mA
Max. input video signal 2Vpp
Insertion loss 0.8dB
Bandwidth >5MHz
Connection of the video signal with distribution on several risers
In video systems with different risers you must use 1 or more video
distributors art. DV2D or DV4D.
Terminals X and Y of the last distributor must be terminated with the 75
Ω
resistances supplied with the article. It is not necessary to terminate the
unused outputs.
Example of connection on 8 risers
X Y H F
3 3
X Y H F 4 4
F H Y X
F H Y X
F H Y X
2 2
F H Y X 1 1
3
"
4
/
1
83
25
4 "
16
/
13
122
1
2 "
16
/
11
68
"
DV2D-DV4D
. FLOOR VIDEO SIGNAL DISTRIBUTORS.
They allow for the distribution of the video signal taken from the riser on
2 or 4 outputs. They can be installed on the wall on a wall box, with
expansion plugs or it can be placed in the junction box.
Connection of the video signal on a single riser
Terminals X and Y of the last distributor must be terminated with the 75
Ω
resistances supplied with the article. It is not necessary to terminate the
unused outputs.
INSTALLATION INSTRUCTIONS
VIDEO SIGNAL DISTRIBUTION WITH TWISTED PAIR
If the distance between the camera and the last video intercom in the
system is lower than 200m (660ft), the connection can be made with
2x0.35mm² wires (Ø=0.6mm; AWG22) instead of the coaxial cable.
For distances from 100m (330ft) to 200m (660ft) a twisted pair must
be used.
For the connection of the video signal you can choose from:
- connection with junction box
- serial connection (input and output)
- connection with floor distributors
CONNECTION WITH JUNCTION BOX
All wires are distributed in the floor junction box.
Due to the signal loss introduced by each connection, the maximum
number of video intercoms that can be connected in serial mode is 20.
Two 75
Ω
resistances must be inserted between X and F and between
Y and F in the last video intercom. The maximum distance between the
video intercoms and the connector block is 2.5 metres.
X
X
Y Y
SERIAL CONNECTION
Connections are made on the video intercom brackets, and not in the
junction box. Due to the signal loss introduced by each connection, the
maximum number of video intercoms that can be connected in serial
mode is 20. Two 75
Ω
resistances must be inserted between X and F
and between Y and F in the last video intercom.