Bosch DCN Next Generation Installation And Operation Manual page 73

Conference System
Length of the longest extension cable sequence
Do as follows:
1.
For example, an extension cable of 20 m is connected directly to a DCN socket of the central
control unit. To the extension cable, a trunk splitter is connected. To each tap-off socket of
the trunk splitter, an extension cable is connected. One extension cable has a length of 10 m,
the other extension cable has a length of 40 m. The length of the longest extension cable
sequence is, in this example: 20 + 40 = 60 m.
Figure 4.4 Power correction graph
Graph
The power correction graph corrects the power level to compensate for the extension cables.
Do as follows:
1.
2.
3.
4.
The intersection of both values gives the necessary power from the socket. In this example it
is 53 W.
Bosch Security Systems B.V.
Add together the lengths of all extension cables in the longest sequence.
85
80
75 81
70
76 84
65
70 78
72 80
60 65
66 73
55 60
50 66
54 60
45
49 54 60
40 43 48 53
35 38 42 46
30 32 36 40
25 27 30 33
20 21 24 26
15 16 18 20
10
11 12 13
5
6 6 6
0 20 40 60
DCN-CCU2, DCN-CCUB2, DCN-EPS
Find the total power consumption (as explained in the previous chapter 'Total power
consumption') on the vertical axis (Y) of the power correction graph. For example, 40 W.
Find the length of the longest extension cable sequence on the horizontal axis (X) of the
power correction graph. For example, 60 m.
The intersection of both values gives the necessary power from the socket. In this
example it is 53 W.
The maximum power from a DCN socket of the central control unit or the extension
power supply, is 85 W. The necessary power from the socket should not exceed this. This
example with only 53 W is therefore within the system limits.
Installation and Operation manual
82
75 85
83
67 77
73
60 68 80
64
52 70
60
45 51 55 60
37 42 46 50
30 34 36 40
22 25 27 30
15 17 18 20
7 8 9 10
80 100 120 140
Planning | en
76 84
65 72 80
66 75
54 60
60
43 48 53
32 36 40 45
21 24 26 30
11 12 13 15
160 180 200 220 240 250
X: Extension cable (m)
DCN-NG_IOM_V4.1 | V1.3 | 2012.07
73
85
68 73
51 55
34 36
17 18