Siemens SINAUT ST7 System Manual page 221

The LTOP variants
The housing contains either one LTOP unit (= LTOP 1) or two LTOP units (= LTOP 2). The
following figures show the design of both LTOP variants with their connectors and
configuration switches.
View from above
X1
X2
X2 + X3
X6
S1 + S2
Station control system
System Manual, 07/2009, C79000-G8976-C178-07
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
Installing and putting a SINAUT modem into operation
5.6 LTOP line transformer with overvoltage protection
Schematic
221