User's Manual Part 1

SYSTEM CONFIGURATION AND CHARACTERISTICS ROI-S05748
2-28
2.6 Power Supply
The power supply systems are shown in Fig. 2-9 (1/3) to (3/3). The DC-
DC CONV module in the MODEM module produces regulated +3.6 V DC
from −48 V *1 DC input for the component modules on the IDU. Also,
this module supplies a −48 V DC to the ODU.
The DC V to the ODU is supplied through the
coaxial cable which is also
used for the IF and other signals. The PS circuit on the ODU produces +7/
+8/+9/−7/−8/−9 * and −15 V DC for the component modules from the −48
V DC supplied from the IDU.
Note: *: Necessary voltages in the ODU
vary depending on the ODU
type.
DC
INPUT
(1/3)
(2/4)
ODU (NEO)
PS
SELV
−48 V
TX IF
−15 V
MODEM
DC-DC
IDU
−48 V
SEP/
COMB
FIL
CTRL, OC-3 INTFC, LAN INTFC, GbE INTFC
CONV
ODU INTFC
G
−48 V
SEP/
COMB
FIL
RX IF
SV/CTRL
TX IF
RX IF
SV/CTRL
FUSE
PWR
−7/−8/−9 V
+7/+8/+9 V
−48 V
*
1
*
1
*
2
Notes: *1: The inner voltages vary depending on the ODU type.
*2: Optional
For 1+0 Configuration
For 1+0 Configuration
+3.6 V
−48 V
Fig. 2-9 Power Supply System Block Diagram (1/3)