Farfisa PROJECT Series - VIDEO SIGNAL DISTRIBUTION WITH TWISTED PAIR

171
(MT12 - Gb2004)
INSTALLATION INSTRUCTIONS
I
NTERCOMS *
VIDEO INTERCOMS *
TELECOMMUNICATION
VIDEO SIGNAL DISTRIBUTION WITH TWISTED PAIR
For the connection of the video signal you can choose from:
- connection with junction box
- serial connection (input and output)
- connection with floor distributor
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 75Ω 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.
CONNECTION WITH FLOOR DISTRIBUTOR
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 user 1 or more video
distributors art. DV2D or DV4D.
Terminals X and Y of the last distributor must be terminated with the 75Ω
resistances supplied with the article. It is not necessary to terminate the
unused outputs.
Example of connection on 8 risers
XYHF 33
XYHF 44
FHYX
FHYX
FHY X 22
FHY X 11
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 75Ω
resistances supplied with the article. It is not necessary to terminate the
unused outputs.
twisted
pair
If the distance between the camera and the last video intercom in the
system is lower than 200m, the connection can be made with 2x0.35mm²
wires (Ø=0,6mm; AWG22) instead of the coaxial cable. For distances
from 100m to 200m a twisted pair must be used.
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 75Ω resistances must be inserted between X and F
and between Y and F in the last video intercom.