Installing and putting a SINAUT modem into operation
5.7 Analog dial-up modem MD3
Station control system
System Manual, 07/2009, C79000-G8976-C178-07
253
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 line termination with Z = Zr
300 to 33600 1,0 0,4
Maximum range of the MD3 modem in dedicated line mode
Maximum range (km)
Transmit level –15 dB Transmit level -10 dB
Transmission
speed (bps)
With LTOP Without LTOP With LTOP Without LTOP
With line termination with Z = Zr
300 29 30 34 35
1200 to 19200 23 24 28 29
33600 14 15 19 20
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.
5.7.6 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.
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