Mounting and Installation
© Siemens AG 2002 All Rights Reserved 6NH7811-0AA22
MD2 Modem (07/2002)
2-11
Setting the Dedicated Line Properties
Specific settings must be made for the dedicated line connected to the MD2
modem. The settings are for the send level, 2-wire or 4-wire operating mode, two
channel operation for 2-wire dedicated lines and the baud rate. The dedicated line
settings are made with the 5-pin DIL switch. The procedure is as follows:
Switch off the power supply of the modem and make the desired settings using the
DIL switch. When the power is switched on the selected settings become active.
Table 2-10 Settings on the 5-pin DIL switch
Setting on
DIL Switch
Meaning
1 234
OFF
ON
5
Send level –6 dB *)
For details about maximum transmission range see 2-22.
1 234
OFF
ON
5
Send level 0 dB *)
This can be used to increase the transmission range without a repeater.
For details about maximum transmission range see 2-22.
1 2 34
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 34
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').
123 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).
123 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).
1234
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.
1234
OFF
ON
5
Baud rate 2400 bps (see also Note)
At this speed the modem is compatible to SINAUT ST1 modem MD124.
1234
OFF
ON
5
Baud rate 9600 bps
1234
OFF
ON
5
Baud rate 19200 bps
At this speed the modem is compatible to SINAUT ST1 modem MD124.
*) Normally these levels are not allowed on Telecom leased lines. In connection with switch S10 of the
10pin DIL switch (see page 2-15) a reduced level of –9 dB (standard for leased lines) can be set
instead of 0 dB or instead of –6 dB the level can be reduced to –15 dB.
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