Installing and putting a SINAUT modem into operation
5.5 MD2 dedicated line modem
Station control system
System Manual, 07/2009, C79000-G8976-C178-07
217
Attenuation values of the MD2 modem
Table 5- 19 Attenuation values dependent on the transmission speed and wire diameter
Attenuation per km (dB) at wire diam. (mm)
Transmission
speed (bps)
0.6
0.8
0.9
1.2
1.4
Attenuation
per LTOP
(dB)
Insertion
loss per
tapping point
(dB)
Line terminated with Z = 600 ohms
1200
1.5
1.15
0.9
0.65
0.55
0.2
0.4
2400
1.85
1.4
1.1
0.75
0.6
0.2
0.2
Line terminated with Z = 150 ohms
9600 / 19,200
4.3
3.2
2.6
1.8
1.5
1.0
0.2
The values in the table above are guidelines for communication lines without loading coils of
the type 2 x 2 x A J-Y(St)Y (A = core diameter in mm).
Maximum range of the MD2 modem
Table 5- 20 Maximum range dependent on the transmission speed and wire diameter
Maximum range (km)
Transmit level –6 dB
*)
Transmit level 0 dB
*)
Transmission
speed (bps)
With LTOP
Without LTOP
With LTOP
Without LTOP
Core diameter 0.6 mm
1200
21.7 – NTP x 0.6
22 – NTP x 0.3
25.7 – NTP x 0.6
26 – NTP x 0.3
2400
17.6 – NTP x 0.4
17.8 – NTP x 0.2
20.8 – NTP x 0.4
21 – NTP x 0.2
9,600 / 19,200
7.2 – NTP x 0.6
7.6 – NTP x 0.1
8.6 – NTP x 0.6
9 – NTP x 0.1
Core diameter 0.8 mm
1200
28.3 – NTP x 0.7
28.6 – NTP x 0.4
33.5 – NTP x 0.7
33.9 – NTP x 0.4
2400
23.2 – NTP x 0.5
23.5 – NTP x 0.2
27.5 – NTP x 0.5
27.8 – NTP x 0.2
9600 / 19,200
9.6 – NTP x 0.7
10.3 – NTP x 0.1
11.5 – NTP x 0.7
12.1 – NTP x 0.1
Core diameter 0.9 mm
1200
36.2 – NTP x 0.9
36.6 – NTP x 0.5
42.8 – NTP x 0.9
43.3 – NTP x 0.5
2400
29.6 – NTP x 0.6
30 – NTP x 0.2
35 – NTP x 0.6
35.4 – NTP x 0.2
9600 / 19,200
11.9 – NTP x 0.9
12.6 – NTP x 0.1
14.2 – NTP x 0.9
15 – NTP x 0.1
Core diameter 1.2 mm
1200
50.1 – NTP x 1.3
50.7 – NTP x 0.7
59.3 – NTP x 1.3
60 – NTP x 0.7
2400
43.4 – NTP x 0.8
44 – NTP x 0.3
51.4 – NTP x 0.8
52 – NTP x 0.3
9600 / 19,200
17.2 – NTP x 1.3
18.3 – NTP x 0.2
20.5 – NTP x 1.3
21.6 – NTP x 0.2
Core diameter 1.4 mm
1200
59.2 – NTP x 1.5
60 – NTP x 0.8
70.1 – NTP x 1.5
70.9 – NTP x 0.8
2400
54.3 – NTP x 1
55 – NTP x 0.4
64.3 – NTP x 1
65 – NTP x 0.4
9600 / 19,200
20.6 – NTP x 1.5
22 – NTP x 0.2
24.6 – NTP x 1.5
26 – NTP x 0.2
