5.
6
(MT13 - En 2015)
2302
. Twisted pair cable specified for the digital installation with DUO
systems.
Technical characteristics of cable
Number of conductors:
2
Colour of conductors:
red/black
Cross-section:
2x1mm²
Material:
tinned copper
Twisting pitch:
40mm
Nominal impedance:
100
Ω
2302E
. Cable for outdoor use with the same characteristics as item
2302.
Conductors
For connection of equipment throughout the Duo digital system a non-
polarised two conductor cable is used preferably with twisted wires.
The wires must be sized according to the distance to the various
apparatus and the number of modules to be applied.
It is also important to comply with the recommended maximum distances
between the various apparatus as indicated in the table of wire sizes.
The use of inadequate wire sizes and a lack of compliance with the
distance between the various apparatus could compromise the
performance and affect the proper operation of the system.
Table 5.3.
Maximum permitted distances of the videointercom systems (measures in meters)
Section
Type of cable
Distance between:
Farfisa
NOT twisted
Twisted
CAT5
art.2302
AWG18
AWG22
AWG24
(2x1mm²
(2x0.75mm²
(2x0.32mm²
(2x0.2mm²
art.2220S and external door station
A
50
35
10
5
art.PRS210 and 2273
B (*)
150
100
150
150
external door station and art.DV2420, 2231
C (*)
150
150
150
150
farthest external door stations and internal stations
D
50
35
5
5
art.2221S-2221ML and DV2420
E
30
20
20
20
art.DV2421-DV2424 and internal station connected to it
E1+E2+..En
300
200
300
300
adding all the E sections
F (*)
150
130
50
35
art.DV2420, 2231, DM2444 and farthest internal station
(*)
These distances can be increased by applying one or more video amplifiers correctly (examples from page
5.11 to 5.13)
Table 5.2.
Maximum permitted distances of the intercom sys-
tems (measures in meters)
A = Distance between power supply 2220S and door station.
C = Distance between farthest external door stations and internal
stations.
Section
Type of cable
Farfisa
NOT twisted
Twisted
CAT5
art.2302
AWG18
AWG22
AWG24
2x1mm²
2x0.75mm²
2x0.32mm²
2x0.2mm²
A
50 m.
50 m.
35 m.
10 m.
C
1000 m.
700 m.
300 m.
200 m.
B
F
C
E1
En
A
DL
DV...
DV...
D
VC
CT
AP
PE
VC
AL
Schematic for distance calculation
Video intercom system to 1 external station and 1 riser
AL = Power supply 2221S
or 2221ML
AP = Power supply 2220S
CT = Intercom
DL = Distributor DV2420
DV = Video distributor
PE = Door station
VC = Videointercom
INSTALLATION NOTES
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