INSTALLATION GUIDE FOR mBDA OD SERIES
ENU STATUS : 1-0-0
Copyright - refer to title page
Page 14
2.3
EQUIPMENT CONSTITUTION
The typical mBDA unit consists of the following components:
Power Amplifier (PA):
It fulfils power amplification in both UL and DL branches.
Main Control Unit (MCU):
The MCU is used to monitor and control the operation of the repeater. It also
provides the communication interface for remote control and indication. LED indicators provide the
operation status of the MCU.
Duplexer:
The DPX is located towards the MT terminals and permits the uplink and downlink signals to
share a common antenna.
Digital Integrated Module and Power Amplifier
: Consists of Power Conversion module, RF module,
digital process module and monitoring module. Power Conversion module co28V DC voltage in to
+9VJK and +9VRF. +9VJK, +9VRF are supplied to monitoring unit and RF unit in integrated module
separately. RF module amplifies and converts the RF signal to IF signal. Digital process module converts
the IF signal into baseband signal via AD conversion and extraction, filtering. After that, IF signal will be
amplified and converted to RF signal by RF module for RF filtering and amplification. Monitoring module
monitors and controls the system parameters and is the interface of both remote monitoring and local
commissioning.
Power Supply Unit (PSU):
The PSU converts the input voltage into a stable DC to provide power for the
internal functional modules and to charge the internal Li-ion battery.
Li-ion Battery:
Provides power to the Main Control Unit to send alarm signals in the event of power failure
Distribution Board: Power co28V DC voltage in to +9VJK and +9VRF. +9VJK, +9VRF are supplied
to main control unit and modem.
Modem:
The modem is used for remote control and monitors, and for alarm transmission from the repeater
to the OMC. The first unit has modem and can share the modem for second unit remote monitor and control,
2 mBDA connect each other via RS-485 communication cable.
