TC12 Installation, Commissioning & Maintenance Handbook
666/HE/43100/000
Page 33
Issue 10
Table 3 - Modem PCB 2/4 Wire Select Switch (SW4)
2 - Wire Operation
4 - Wire Operation
MODEM 1 Switch 1
→
2 - Wire
Switch 1
→
4 - Wire
MODEM 2 Switch 2
→
2 - Wire
Switch 2
→
4 - Wire
MODEM 3 Switch 3
→
2 - Wire
Switch 3
→
4 - Wire
MODEM 4 Switch 4
→
2 - Wire
Switch 4
→
4 - Wire
1
2
3
4
2 - WIRE
4 - WIRE
SW4
Table 4 - Modem PCB Transformer Select Switch (SW5)
Switch numbers (Corresponds to Modem with same number)
1 2 3 4
5
6
Set switch to 1 (Closed) to select on board
transformer for the Modem in question i.e. for
any Modem NOT connected to a transformer
board.
NOT USED
Set switch to 0 (Open) to select off board
transformers for the Modem in question i.e. for
any Modem connected to a transformer board.
See Figure 8 for Switch Positions for Switches 0 and 1
