Instructions for Operation with SINAUT ST1
6NH7811-0AA22 © Siemens AG 2002 All Rights Reserved
3-4 MD2 Modem (07/2002)
3.2.1 Modem Settings
Setting the Dedicated Line Properties
A few settings must be made on the DIL switches in order to operate the MD2
modem with a SINAUT ST1 device. The following table lists the settings for the
dedicated line properties.
Table 3-4 Settings on the 5-pin DIL switch
Setting on
DIL Switch
Meaning
1 2 3 4
OFF
ON
5
Send level –6 dB.
Detailed information about the distances that can be bridged is available in
Chapter 6 Technical Data
1 2 3 4
OFF
ON
5
Send level 0 dB
This can be used to increase the transmission distance without a repeater.
Detailed information about the distances that can be bridged is available in
Chapter 6 Technical Data
1 2 3 4
OFF
ON
5
4-wire mode
This setting is required when the send and receive direction each use a
separate pair of cores. In this mode the position of switch 3 has no
relevance.
1 2 3 4
OFF
ON
5
2-wire mode
This setting is required when a common pair of cores is used for the send
and receive direction. In this mode the position of switch 3 is relevant. This
is then used to set whether only one 2-wire line is connected (channel 1) or
whether two 2-wire lines are connected (channel 1+2), for example, in a
control center when the communication to the stations is made via two
separate 2-wire connections ('small star network').
1 2 3 4
OFF
ON
5
Channel 1 (2-wire)
In the 2-wire mode only channel 1 is used, in other words, only one 2-wire
line is connected to the modem (see also switch 2).
1 2 3 4
OFF
ON
5
Channel 1+2 (2-wire)
In the 2-wire mode channels 1+2 are used, in other words, two separate 2-
wire lines are connected to the modem (see also switch 2).
1 2 3 4
OFF
ON
5
Baud rate 1200 bps (see also Note)
At this speed the modem is compatible to SINAUT ST1 modems MD100,
MD124 and LGM 1200H1.
1 2 3 4
OFF
ON
5
Baud rate 2400 bps (see also Note)
At this speed the modem is compatible to SINAUT ST1 modem MD124.
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