Installation and commissioning of the modems and routers
5.7 Analog dial-up modem MD3
SINAUT ST7 station control system
System Manual, 09/2016, C79000-G8976-C178-10
213
Attenuation values of the MD3 modem in dedicated line mode
Table 5- 38 Attenuation values of the MD3 modem in dedicated line mode
Transmission speed (bps)
Attenuation per km
(dB)
Attenuation per LTOP
(dB)
with cable termination where Z = Zr
300 to 33600
1.0
0.4
Maximum range of the MD3 modem in dedicated line mode
Table 5- 39 Maximum range of the MD3 modem in dedicated line mode
Transmission
speed (bps)
maximum range (km)
Transmission level –15 dB
Transmission level –-10 dB
with LTOP
without LTOP
with LTOP
without LTOP
with cable termination where Z = Zr
300
29
30
34
35
1200 to 19200
23
24
28
29
33600
14
15
19
20
The values shown in the table are guide values for a message line of the type 2 x 2 x 0,8 J-
Y(St)Y (non-coil-loaded line).
When determining the maximum ranges, a level reserve of 4 dB was included. This was
intended to ensure that even when fluctuations in the cable properties occurred, that
experience shows do occur during operation, there was still an adequate level for
undisturbed data transmission.
5.7.6
User-configurable profiles
Introduction
Apart from the 7 standard profiles for dial-up mode (profile 0 to 6) and dedicated line mode
(profile 8 to 14), the MD3 modem makes a freely configurable profile available for every
mode. Profile 7 is freely configurable profile for dial-up mode, profile 15 for dedicated line
mode.
The configuration of both profiles is performed by a PC using At commands. To do this, the
PC and modem are connected to each other via a cable. On the PC the connecting cable is
connected to COM1 or COM2, on the modem via the RS-232 interface.
The AT commands are transferred by a terminal program. Hyper-Terminal of WINDOWS is
suitable for this.
Connection between PC and modem
To transfer the AT commands, the connection is established between the PC and modem
with the SINAUT ST7 standard cable 6NH7701-4AL. If the standard cable is not available, a
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