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Attenuation values of the MD3 modem in dedicated line mode
Table 5- 38
Transmission speed (bps)
with cable termination where Z = Zr
300 to 33600
Maximum range of the MD3 modem in dedicated line mode
Table 5- 39
Transmission
with cable termination where Z = Zr
300
1200 to 19200
33600
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
SINAUT ST7 station control system
System Manual, 09/2016, C79000-G8976-C178-10
Attenuation values of the MD3 modem in dedicated line mode
Maximum range of the MD3 modem in dedicated line mode
speed (bps)
Transmission level –15 dB
with LTOP
29
23
14
Installation and commissioning of the modems and routers
Attenuation per km
(dB)
1.0
maximum range (km)
without LTOP
30
24
15
5.7 Analog dial-up modem MD3
Attenuation per LTOP
(dB)
0.4
Transmission level –-10 dB
with LTOP
without LTOP
34
35
28
29
19
20
213
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