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
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Modem A and modem B for dedicated line mode
When setting up a point-to-point link, remember that the two MD3 modems being used for
the connection must have different parameter settings. To simplify matters, the modems with
the difference settings are referred to as "modem A" and "modem B". "Modem A" (originate)
is the modem in the role of active modem that attempts to establish the connection to the
partner over the dedicated line. Modem B (answer) is the passive answering modem during
connection establishment.
During connection establishment, the modems synchronize themselves to establish a duplex
connection for data transmission.
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Figure 5-31 Point-to-point link between two MD3 modems over a 2-wire dedicated line
Settings for a standard dedicated line profile
Apart from the default setting for the dedicated line mode, switches SW2.2, SW2.3 and
SW2.4 can be used to select one of the 8 dedicated line profiles. Standard dedicated line
profiles 8 to 14 are default settings that enable the MD3 modem to be operated without any
programming using a terminal program if one of these dedicated line profiles matches the
intended application. Standard dedicated line profile 15 can be freely configured by the user
and therefore requires programming by a terminal program before it can be put into
operation.
The procedure is as follows:
Turn of the power supply and set the four switches SW2.1 to SW2.4 to the required position.
When you turn on the power supply, the modem then adopts the selected standard
dedicated line profile.
The following table lists the properties of the individual dedicated line profiles and how to set
them using the switches mentioned above.
