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X1
X2
X2 + X3
X6
S1 + S2
View from above
5.6.2
Connecting up the MD2 modem
The following figures show the connection of the standard cable modem MD2-3. The
connection to the LTOP1 or LTOP2 is via the standard cable that ships with the modem. This
cable has RJ-12 Western plugs at both ends.
Please make sure that the MD2-3 modem has the correct line termination setting:
● For end point 1200 or 2400 bps: 600 ohms
● For end point 19,200 bps: 150 ohms
● For a tapping point: High resistance
Note
Please make sure that the S1 and S2 switches are set correctly in position 1 or 2 as shown
in the following figures!
SINAUT ST7 station control system
System Manual, 09/2016, C79000-G8976-C178-10
Installation and commissioning of the modems and routers
Dedicated line (screw terminals 1, 2, 5, 6)
Chassis (screw terminals 3, 4)
Modem attachment 2-wire over screw terminals
Modem attachment 4-wire over screw terminals
2-wire/4-wire modem attachment over RJ-12 Western connector; for direct connection of
the SINAUT ST7 MD2 modem over the standard connecting cable (RJ-12 – RJ-12) that
ships with this modem.
Configuration switches
5.6 LTOP line transformer with overvoltage protection
Schematic
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