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General information on the conduit in TCS video systems
6-wire operation
The 6-wire operation is the standard operation mode. Video operation
which is used with two separated earth connections (b and M).
The conduit is determined by the structural conditions and is limited only
by its length.
Observe when selecting the cable length: the loop resistance of a-b
and M-P must not exceed max. 8 Ω (table 1).
When the loop resistance exceeds > 8 Ω: plan multiple wiring of the
strands (double twisted lines).
optional strand or star formed wiring
Do not use more than 20 video indoor stations per strand. For systems
with more video indoor stations use video distributors (FVY1200,
FVY1400).
Up to 64 front-door stations (16 of them video front-door stations) and
an almost unlimited number of indoor stations can be connected polari-
ty-free (a/b) within one system (polarity-free only in 6-wire operation).
Thus, a suitable power supply and control unit is to be used.
Table 1: Loop resistances
cable length
a-b/ M-P in m
10
20
30
40
50
60
70
80
90
100
cable diameter
0.6 mm
loop resistance in Ω
1.28
2.55
3.83
5.10
6.38
7.65
0.8 mm
0.71
1.43
2.14
2.86
3.57
4.29
5.00
5.71
6.43
7.14
23
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