Figure 10 - Modem Pcb Layout - Siemens TC12 Installation, Commissioning And Maintenance Handbook

Off PCB '0'
Level
For switches SW1, SW2, SW3, SW3, SW5, SW6 and SW7 the switch is:
OPEN i.e. '0' WHEN PUSHED DOWN TO THE LEFT, and
CLOSED i.e. '1' WHEN PUSHED DOWN TO THE RIGHT
As a reminder the '0' and '1' positions are shown on the silkscreen below SW1 and
SW7.
For SW4, 4-wire is selected with the switch to the left and 2-wire is selected with the
switch to the right as shown above.
666/HE/43100/000
TC12 Installation, Commissioning & Maintenance Handbook

Figure 10 - Modem PCB Layout

Mode
S1
Select
0 1
Line
S2
Level
Line
S3
Level
2/4 Wire
4 Wire
Selector
S4
Level
Level
Transformer
S5
Select
Line
S6
Level
Line
S7
Level
0 1
Page 30
Variant
2 Wire
Level
On PCB '1'
Level
1 (TOP)
PL1
24 Way to
IMD panel
24
1 (TOP)
PL2
14 Way to
PSU card
14
37
PL3
37 Way 'D'
to MDF or
Transformer
PCB.
1 (TOP)
Issue 10