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TC12 Installation, Commissioning & Maintenance Handbook
666/HE/43100/000
Page 30
Issue 10
Figure 10 - Modem PCB Layout
1 (TOP)
24
PL1
24 Way to
IMD panel
1 (TOP)
14
PL2
14 Way to
PSU card
S1
PL3
37 Way ‘D’
to MDF or
Transformer
PCB.
1 (TOP)
37
S2
S3
S4
S5
S6
S7
Mode
Select
0 1
Line
Level
Line
Level
2/4 Wire
Selector
Level
4 Wire
Level
2 Wire
Level
Transformer
Select
Off PCB ‘0’
Level
On PCB ‘1’
Level
Line
Level
Line
Level
0 1
Variant
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.