1.32 EQUIPMENT CONSTITUTION
The typical PS BDA/MU and Fiber DAS consists of the following core components:
Master Digital Board and Slave Digital Board: The MCU is used to monitor and control the operation of the
BDA/MU/RU/FOU. It also provides the communication interface for remote control and status indication. LED
indicators provide the operation status of the MCU.
Multiplexer: The duplexer or triplexer is located near the MT and DT terminals and permits the uplink and
downlink signals to share a common antenna line while also rejecting non-desired out-of-band signals.
700MHz/800MHz Digital Integrated Module and Power Amplifier: Consists of the Power Conversion module,
RF module, digital process module and monitoring modules. The Power Conversion module converts +28V
DC voltage into +9VJK and +9VRF. +9VJK, +9VRF are supplied to the monitoring unit, and the RF unit in the
integrated module separately. The RF module amplifies and converts the RF signal to IF signal. The Digital
process module converts the IF signal into baseband signal via AD conversion and extraction, and filtering.
After that, the IF signal will be amplified and converted to an RF signal by the RF module for RF filtering and
amplification. The Monitoring module monitors and controls the system parameters and is the interface for both
remote monitoring and local commissioning.
Power Supply Unit (PSU)/Charger: The PSU/Charger converts the input voltage into a stable DC supply to
provide power for the internal functional modules as well as charging the batteries.
Power/Charging Switch Panel: The PSU/Charger switch panel is in the BDA/MU and RU devices and
contains the main AC and Battery Charging switches to control turning the device ON or OFF.
Power ON/OFF Switch: The Power ON/OFF switch is located inside the FOU and AP devices. It is a
standalone switch used to control turning the device ON or OFF.
Mute/Lamp Test Switch: The Mute/Lamp Test switch is used for two functions. The user can push the button
briefly to silence any current alarms. Additionally, the button can be held for a period longer than 5 seconds to
test the alarm annunciator LEDs and the alarm buzzer.
Door Switch: Most devices contain a door switch which is used to generate an alarm when the door is open.
Power and Communications Distribution Board: The Power and Comms Distribution Board is inside the
FOU and consists of the power distribution and communication distribution components. These components
are used to extend power and communications from the BDA/MU to the main FOU and additional expansion
FOUs.
Fiber-Optic Modules: The Fiber-optic modules are inside the FOU, and the RUs and they are used to convert
RF signals to Optical signals and vice-versa to extend the signals over a long distance of fiber with minimal
losses.
Annunciator and Status LED Modules: The annunciator and status LED modules are simple LED boards
which interface to the main digital board and will illuminate under certain alarm conditions.
Passive Components for RF Distribution: Passive components like couplers, splitters, and coax cables can
be found in most components and they are used to distribute the signals internally to different RF components
in the device.
End of Section
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