Other Devices; Figure 3.3 Power Structure Of Outdoor Spi-2331 - Samsung Mobile WiMAX Outdoor RAS SPI-2331 System Description

3.2.3 Other Devices

ULPU
ULPU is power device of outdoor SPI-2331, performs the DC/DC converter(DC -48 V
DC +12 V converting) function and provides the -48 VDC to heater.
The power structure of outdoor SPI-2331 is as follows:
Heater
ULDB
-48 VDC
Fuse
-48 VDC
ULPM-2FE
This protects the external electric interface lines of the outdoor SPI-2331, e.g., the electric
backhaul interface from an electrical overload such as lightning.
Heater
If the system's internal temperature goes below the standard operating temperature during
system initialization or operation, the heater heats up the system.
The ULDB controls the heater according to the temperature recorded by the temperature
sensor, which is fitted inside the outdoor SPI-2331.
Cold Start & low temperature mode: Operating the heater
Normal temperature & high temperature mode: Stopping the heater
© SAMSUNG Electronics Co., Ltd.
Mobile WiMAX Outdoor RAS SPI-2331 System Description/Ed.02
3.3 VDC
VRM
VRM
5.7 VDC
1.1 VDC
VRM
1.0 VDC
1.2 VDC
VRM
1.8 VDC
12 VDC
Converter

Figure 3.3 Power Structure of Outdoor SPI-2331

VRM
VRM
VRM
VRM
VRM
Reverse
Filter
polarity
protection
circuit
UCCM
ULRB
3.3 VDC
3.3 VDC
5.0 VDC
5.0 VDC
5.0 VDC
ULPU(DC/DC)
Fuse
-48 VDC
3-7