Specifications

3U Traffic Outstation Handbook
667/HB/26568/000 Page 50 Issue 15
S5 S6
OR
OR
OR
PSU
CPU
Card
I/O Board #1
I/O Board #2
I/O Board #3
LMU I/O Board Bus MOVA I/O Board
Edge
of the
board
S1
14
ON
32
Edge
of the
board
1
5
6
ON
21
ON
2
ON
1432
ON
1432
ON
1432
S1
ON
12
ON
12
ON
12
ON
12
ON
12
ON
12
LMU I/O
Board
Bus / MOVA
I/O Board
Figure 11 – I/O Board
Switch position 4 of S1 on the LMU I/O board is used for switching the lamp monitor
between 50Hz and 60Hz operation (OFF = 50Hz, ON = 60Hz), see section 5.2.3.
5.2.2 Modem Power Supply Selection (All Board Types)
5
OMCU C/P BUS MOVA
Set up modem power selection
5.2.2
The unit can supply any one of three different voltage supplies, 5V, 8V and 12V all at
300 mA capability from I/O Board #1, which may be an LMU or a Bus / MOVA I/O
board. Check which supply is required by the modem using the Modem Supply List
shown on 667/GA/26580/000 Sheet 2 in Appendix B .
On the LMU I/O board, insertion of the modem power lead into the relevant
connector socket in the LMU analogue connector PL1 selects which supply to use as
follows. The orange link wire connects to the first relay on the board, which is used to
control power to the modem as part of its initialisation sequence.
Cableform Position Voltage Supply Wire colour of power cable
PL1 socket 27 Supply to Modem Yellow wire
PL1 socket 28 Link (see below) Orange wire
PL1 socket 29 12V Supply Orange wire (if 12V required)
PL1 socket 30 8V Supply Orange wire (if 8V required)
PL1 socket 33 5V Supply Orange wire (if 5V required)
PL1 socket 34 Common Return Black wire