Mounting and Installation
© Siemens AG 2002 All Rights Reserved 6NH7811-0AA22
MD2 Modem (07/2002)
2-33
Note
The protective elements in the OPM (Overvoltage Protection Module) undergo
high stress during discharge processes and progressively deteriorate. Therefore
it is recommended to replace the OPMs every one year. To be on the safe side
within regions with frequent thunderstorms this period should be reduced to about
6 months.
LTOP Models
Either one LTOP unit (= LTOP1) or two LTOP units (= LTOP2) is accommodated in
a single housing. The following figures show the design of both LTOP versions
with their connectors and adjustment switches.
View from above Schematic diagram
Fig. 2-18 LTOP1
Legend:
X1 Dedicated line (screw terminals 1, 2, 5, 6)
Ground (screw terminals 3, 4)
X2 Modem connection 2-wire through screw terminal
X2 + X3 Modem connection 4-wire through screw terminal
X6 2-Wire/4-wire modem connection via RJ12 Western connector; for direct
connection of the SINAUT ST7 MD2 modem via the standard
interconnecting cable (RJ12 – RJ12) which is supplied with this modem.
S1 + S2 Adjustment switches
1234
X1
S1
X2
21
12
X6
1 2
X2
2
1
S1
X6
21 43
X1
LTOP1
RJ12
2534
Modem
connection
Dedicated line
connection
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