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Installing and putting a SINAUT modem into operation
6.6 Analog dial-up modem MD3
Attenuation values of the MD3 modem in dedicated line mode
Table 6-39
Transmission speed (bps)
With line termination with Z = Zr
300 to 33600
Maximum range of the MD3 modem in dedicated line mode
Transmission
With line termination with Z = Zr
300
1200 to 19200
33600
The values in the table are guidelines for communication lines without loading coils of the
type 2 x 2 x 0,8 J-Y(St)Y.
When calculating the maximum range, a power margin of 4 dB was included. This is to
compensate for fluctuations in cable properties that experience has shown to occur in
practise, and thus always ensure that sufficient signal level is available for problem-free data
transmission.
6.6.6
User-configurable profiles
Introduction
Apart from the seven standard profiles for dialing mode (profile 0 to 6) and dedicated line
mode (profile 8 to 14), the MD3 modem provides a further user-configurable profile for each
mode. Profile 7 is available as a user-configurable profile for dialing mode, profile 15 for
dedicated line mode.
Both profiles are configured at a PC using AT commands. The PC and modem are
connected together using a cable. On the PC, the connecting cable is attached to COM1 or
COM2, on the modem over the RS-232 port.
The AT commands are transferred using a terminal program. One suitable program is
HyperTerminal from WINDOWS.
Connecting the PC and modem
To transfer the AT commands, the PC and modem are connected using the SINAUT ST7
standard cable 6NH7701-4AL. If the standard cable is not available, a connecting cable with
two 9-pin D-sub female connectors and the following pinout can be used.
294
Attenuation values of the MD3 modem in dedicated line mode
speed (bps)
With LTOP
Attenuation per km
(dB)
1,0
Maximum range (km)
Transmit level –15 dB
Without LTOP
29
30
23
24
14
15
Attenuation per LTOP
(dB)
0,4
Transmit level -10 dB
With LTOP
34
28
19
SINAUT ST7 Station control system - System Manual
System Manual, 05/2007, C79000-G8976-C178-06
Without LTOP
35
29
20
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