11
2 .4 Diagram of signal conversion
Signal
indicated
in dBm
Signal
with
button
test
Signal
indicator
•
Note: At a signal strength
below 12, a stable
connection to the unit
cannot be guaranteed.
•
The installation must not
be handed over before
the signal strength is 12
or more. In some cases
it might be necessary to
mount an external antenna.
•
If an external antenna is
mounted, this must be
positioned in a place where
it is not shielded, covered,
or moved. Nor must it be
mounted in closed metal
cabinets.
• Only use dual-band GSM
antennas.
•
Always complete the
installation by sending an
SMS (
=signal#
) to control
the signal strength when
all doors and cabinets are
closed.
-113
0
0
-111
1
0
-109
2
0
-107
3
0
-105
4
0
-103
5
0
-101
6
0
-99
7
0
-97
8
0
-95
9
1
-93
10
1
-91
11
1
-89
12
2
GSM minimum
-87
13
2
-85
14
2
-83
15
3
-81
16
3
-79
17
3
-77
18
4
-75
19
4
-73
20
4
-71
21
5
-69
22
5
-67
23
5
-65
24
5
-63
25
5
-61
26
5
-59
27
5
-57
28
5
-55
29
5
-53
30
5
-51
31
5
