10(48)
Date
Rev
Documentnumber
Prepared
Doc respons/Approved
Checked
Reference
1999-07-15
A
1531-BDV BS 101 05 Uen
INSTALLATION INSTRUCTION
Subject responsible
6.2
Connection of CM-Boards
Connect the correct type of call metering board, according to the figure below, on BTU-A board ROF 157 5110/_ or
ROF 157 5127/_ and in the same fashion on the BTU-C board ROF 157 5111/_. The BTU-C cannot be equipped
with a CM50 board as the flat ribbon cable cannot be connected and CM12/16 (ROA 219 5135/1).
The following boards are available CM50 ROA 219 5064/1, with flat ribbon cable and CM12/16 ROA 219 5135/1 or
ROA 219 5062/1 without cable.
6.3
System Power Consumption
The power demand of the system comprises the sum of the current demands of all extensions, base stations etc.
This total current has to be delivered by the power supply. Choose the one delivering the rated current with a suitable
margin for add-on equipment depending on the installation site.
6.3.1
Base Station Power Demand
To minimise the power dissipation on the serial communication wires, EPP should be used extensively. Up to 4 BS
can be connected to the IC-CU2.
The total 48 VDC current load of the BS on the power supply has to be calculated as follows:
CM-
board
Line 0 - 1
Line 2 - 3
Line 4 - 5
Note: When installing a CM50-board connect the
cable before mounting the CM50-board. The
BTU-A board must also be connected to
earth.
Assuming 4 Base Stations are already
984 mA
Total load on power supply:
1424 mA
440 mA
This total load for the exchange can be
supplied by the power supply as it is less
than 2.1A.
Power demand taken from Power Calcu-
lations below, for telephones:
Cable
100m
200m
300m
400m
500m
600m
700m
800m
1,1km
1,2km
1,3km
1,4km
1,5km
1,6km
length
0m
STD
EPP
104
110
114
104
106
110
112
115
119
121
125
129
121
129
104
108
110
114
118
104
106
108
109
110
112
114
117
118
STD
EPP
0,5 mm
∅
0,6 mm
∅
connected they consume a current of:
900m
1,0km
152
160
171
183
133
139
146
204
127
129
131
135
121
123
125
137
Line length to Base Station:
Resistance of loop:
Cable diameter (
φ
):
200m
0.18
Ω/
m
0,6 mm
Calculation example:
This table states the current demand in mA for a Base Sta-
tion depending on the cable length and cable diameter.
STD
EPP
77
83
87
104
106
110
112
115
119
121
125
129
94
103
104
108
110
114
118
104
106
108
109
110
112
114
117
118
STD
EPP
0,5 mm
∅
0,6 mm
∅
152
160
171
183
133
139
146
204
127
129
131
135
121
123
125
137
