Filter
Top Products
2
Bosch Security Systems | 04-2003 | 3922 988 43318 en
Digital Congress Network | Installation and Operating Manual | Chapter 10 - Installation Techniques
en | 10-9
Calculating the PCF of a System with respect to cable length
10.4.3 Graph reference examples
FIG 10-12 in combination with the PCF graph (FIG 10-10) gives examples of how to calculate the
PCF value of a single trunk-outlet. Using these examples, the total PCF value of all three trunk-outlets
of a CCU can be calculated.
TS = Trunk-splitter DA1 = Dual Audio Interface units
TT = Table-top discussion units MPC = Multi-purpose Connection units
CON = Concentus units
NOTE: (1 m = 39.37 in)
FIG 10-12 PCF Calculation examples for a single trunk-line
1
50 x 2 m = 100 m
TS
TT
50
TT
59
TT
49
TT
341
TS
TT TT
140DAI DAI
40 x 2 m = 80 m
130MPC
CON
CON CON
CON
MPC
1DAI 22DAI
30 x 2 m = 60 m
34 x 2 m = 68 m
100 m
Ext. cable
TS
22 x 2 m =44 m
100 m
100 m
Ext. cable
Ext. cable
17MPC1MPC
TS
17 x 2 m = 34 m
PCF CALCULATION
BLOCK DIAGRAMS
GRAPH REFERENCE
TT = 59 x 1 PCF = 59 PCF
TS = 1 x 1 PCF = 1 PCF
TOTAL = 60 PCF
DAI = 40 x 1.5 PCF = 60 PCF
TOTAL = 60 PCF
TT = 34 x 1 PCF = 34 PCF
TS = 1 x 1 PCF = 1 PCF
TOTAL = 35 PCF
+ Ext. cable = 60 PCF
DAI = 22 x 1.5 PCF = 33 PCF
TS = 1 x 1 PCF = 1 PCF
TOTAL = 34 PCF
+ Ext. cable = 60 PCF
MPC = 17 x 2 PCF = 34 PCF
TS = 1 x 1 PCF = 1 PCF
TOTAL = 35 PCF =
+ Ext. cable = 60 PCF
MPCU = 30 x 2 PCF = 60 PCF
TOTAL = 60 PCF
Y axis X axis (max.)
PCF Ext. Cable (m)
60 0
60 0
60 0
1
24
24 x 2 m = 48 m
CON = 24 x 2.5 PCF = 60 PCF
TOTAL = 60 PCF
60 0
35 100
35 100
35 100
Tap-off
Tap-off
Tap-off
Tap-off
100 m
Ext. cable
13
1
TS
13 x 2 m = 26 m
CON =13 x 2.5 PCF = 32.5 PCF
TS = 1 x 1 PCF = 1 PCF
TOTAL = 33.5 PCF =
+ Ext. cable = 60 PCF
35 100
Tap-off
9 x 2 m = 18 m