25H/SP/DDA/2W - TECHNICAL MANUAL
EN-UK - V.1.2 - 04/01/16
26
VIDEX
25H/SP/DDA/2W
(1 way “2 wire” DDA audio intercom kit)
CABLE REQUIREMENTS
The 25H/SP/DDA/2W audio kit follows the same cable requirements for the VX2200
(audio)
system. The
following tables below show the minimum number of cable cores required for this audio kit.
Table B
Connection
Min.
Cores
50m
100m
200m
300m
Art.3171
2
3 pair CW1308
or CAT5e
4 pair CW1308
or CAT5e
4 pair CW1308 or
4 core 0.5mm² YY 4 core 0.75mm² YY
(*
2
Please Note: It is perfectly acceptable to use an equivalent cable type if a CW1308, CAT5e or a YY cable is
not being used providing it meets the same cable characteristics as those described above and those shown
in table B).
The Art.521 power supply should be located as close to the door panel as possible, typically between 20 to
30m
(max.)
. The location of the power supply can also serve as a central point for the Art.3171 audiophone
connections. Any electric door lock and push-to-exit connections can be cabled directly back to the intercom
door panel. If fitting a break glass unit then it should only be wired with a fail safe lock and in series with the
lock. The maximum acceptable resistance for all of these connections = 3Ω
(ohms)
or less for best possible
performance. Table A below shows the recommended cable type to use
*
1
.
Power Supply, Lock Release, Push to Exit and Break Glass Connections
Table A
Connection
20m
30m
(max.)
Art.521 Power Supply
2 core YY @ 0.5mm²
2 core YY @ 0.75mm²
Lock Release
2 core YY @ 0.5mm²
2 core YY @ 0.75mm²
Push to Exit
2 core YY @ 0.5mm²
2 core YY @ 0.75mm²
Break Glass
2 core YY @ 0.5mm²
2 core YY @ 0.75mm²
(*
1
Please Note: It is perfectly acceptable to use an equivalent cable type if a 2 core YY cable is not being used
providing it meets the same cable characteristics as those described above and those shown in table A).
Art.3171 Audiophone Connections
The Art.3171 audiophone requires a 2 core databus connection
(L and -)
with a maximum acceptable
resistance of 7.5Ω
(ohms)
or less. For the databus connections a twisted pair cable should be used. Doubling
up on these connections to increase the CSA
(cross sectional area)
of the connection and reduce the
overall resistance is acceptable, however it should be noted that wherever possible no more than 2 cores
per connection should be used as this can cause an increase in capacitance of the cable. The maximum
acceptable resistance for all of these connections = 7.5Ω
(ohms)
or less for best possible performance. Table
B below shows the recommended cable type to use
*
2
and the cable distance shown is the overall cable run
between the intercom door panel via the central point, where the power supply
(Art.521)
is located, up to
and including where the Art.3171 audiophone is located. If more than one intercom door panel is used on
the system
(multiple entrance system)
then an additional core for the BSY
(busy)
connection will be required,
but will only need to be connected between the central point and the intercom door panels being used.
IMPORTANT NOTE:
Please be aware that when selecting a cable for this audio kit the following
should NOT
be used: Copper Coated Steel
(CCS)
and Copper Clad Aluminium
(CCA)
. While these types of cable may offer
a low cost solution they will have a higher resistance than pure copper cable and can affect the overall
performance of the system therefore Videx
DO NOT
recommend these types of cable.
